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  • 1
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    Experimental Investigation of Entrance-region Heat-transfer Coefficients (1943)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Experimental results of tests made at the Langley Memorial Aeronautical Laboratory are presented to show how heat-transfer coefficients can he increased by a method utilizing the high rate of heat transfer known to exist on any heat-transfer surface in the region adjacent to the edge on which the cooling or heating fluid impinges. The results show that, for the same pressure drop, the average surface heat-transfer.coefficient can be increased 50 to 100 percent when a cooling surface having a length of four inches in the direction of fluid flow is cut to form twenty fins with a length of 0.2 inch in the direction of fluid flow and the fins are sharpened and staggered in the air stream. The percentage of increase in the surface heat-transfer coefficient obtained as a result of shortening the length of the cooling surface varies with the pressure drop of the cooling fluid in passing the surface, the increase being largest when small pressure drop is used and smallest when high pressure drop is used.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-WR-L-239 , NACA-ARR-3K01
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  • 2
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    Compressibility Effects on Heat Transfer and Pressure Drop in Smooth Cylindrical Tubes (1944)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: An analysis is made to simplify pressure-drop calculations for nonadiabatic and adiabatic friction flow of air in smooth cylindrical tubes when the density changes due to heat transfer and pressure drop are appreciable. Solutions of the equation of motion are obtained by the use of Reynolds' analogy between heat transfer and skin friction. Charts of the solutions are presented for making pressure-drop calculations. A technique of using the charts to determine the position of a normal shock in a tube is described.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-WR-L-179 , NACA-ARR-L4C16
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  • 3
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    Study of the Two-Dimensional Flow Through a Converging-Diverging Nozzle (1943)
    In:  CASI
    Details
    Publikationsdatum: 2018-06-05
    Beschreibung: A study of a flow through a straight converging-diverging nozzle of simple design has been made preliminary to studies of other supersonic flows. The diverging part of the nozzle was designed by the Prandtl-Busemann method to give a uniform pressure at its exit of 0.298 times the initial total head, that is, to give a Mach number of 1.436. Schlieren photographs of the flow and pressure-distribution measurements along the diverging part of the nozzle were made. A comparison of the theory with these measurements is presented.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
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  • 4
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    Comparison of Intercooler Characteristics (1942)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: No abstract available
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-WR-E-102
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  • 5
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    Effects of Interaction Between Normal Shock and Boundary Layer (1944)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: A discussion of the interaction between normal shocks and boundary layers on the basis of experimental evidence obtained in studies of supersonic flows in passages is given. The investigation was made as a result of the inability of the existing normal-shock theory to explain phenomena involving normal shocks that occurred in the presence of boundary layers. Assumptions with regard to the character of the effects of interaction between boundary layer and normal shock are proposed; these assumptions seem to give good agreement with certain experimental results.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-CB-4A27
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  • 6
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    InSight Aerothermal Environment Assessment (2020)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-01
    Beschreibung: The InSight spacecraft was proposed to be a build-to-print copy of the Phoenix vehicle due to the knowledge that the lander payload would be similar and the trajectory would be similar. However, the InSight aerothermal analysts, based on tests performed in CO2 during the Mars Science Laboratory mission (MSL) and completion of Russian databases, considered radiative heat flux to the aftbody from the wake for the first time for a US Mars mission. The combined convective and radiative heat flux was used to determine if the as-flown Phoenix thermal protection system (TPS) design would be sufficient for InSight. All analyses showed that the design would be adequate. Once the InSight lander was successfully delivered to Mars on November 26, 2018, work began to reconstruct the atmosphere and trajectory in order to evaluate the aerothermal environments that were actually encountered by the spacecraft and to compare them to the design environments.The best estimated trajectory (BET) reconstructed for the InSight atmospheric entry fell between the two trajectories considered for the design, when looking at the velocity versus altitude values. The maximum heat rate design trajectory (MHR) flew at a higher velocity and the maximum heat load design trajectory (MHL) flew at a lower velocity than the BET. For TPS sizing, the MHL trajectory drove the design. Reconstruction has shown that the BET flew for a shorter time than either of the design environments, hence total heat load on the vehicle should have been less than used in design. Utilizing the BET, both DPLR and LAURA were first run to analyze the convective heating on the vehicle with no angle of attack. Both codes were run with axisymmetric, laminar flow in radiative equilibrium and vibrational non-equilibrium with a surface emissivity of 0.8. Eight species Mitcheltree chemistry was assumed with CO2, CO, N2, O2, NO, C, N, and O. Both codes agreed within 1% on the forebody and had the expected differences on the aftbody. The NEQAIR and HARA codes were used to analyze the radiative heating on the vehicle using full spherical ray-tracing. The codes agreed within 5% on most aftbody points of interest.The LAURA code was then used to evaluate the conditions at angle of attack at the peak heating and peak pressure times. Boundary layer properties were investigated to confirm that the flow over the forebody was laminar for the flight.Comparisons of the aerothermal heating determined for the reconstructed trajectory to the design trajectories showed that the as-flown conditions were less severe than design
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: ARC-E-DAA-TN69598 , AIAA SciTech 2020; Jan 06, 2020 - Jan 10, 2020; Orlando, FL; United States
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  • 7
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    On the Flow of a Compressible Fluid by the Hodograph Method. II - Fundamental Set of Particular Flow Solutions of the Chaplygin Differential Equation (1944)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-15
    Beschreibung: The differential equation of Chaplygin's jet problem is utilized to give a systematic development of particular solutions of the hodograph flow equations, which extends the treatment of Chaplygin into the supersonic range and completes the set of particular solutions. The particular solutions serve to place on a reasonable basis the use of velocity correction formulas for the comparison of incompressible and compressible flows. It is shown that the geometric-mean type of velocity correction formula introduced in part I has significance as an over-all type of approximation in the subsonic range. A brief review of general conditions limiting the potential flow of an adiabatic compressible fluid is given and application is made to the particular solutions, yielding conditions for the existence of singular loci in the supersonic range. The combining of particular solutions in accordance with prescribed boundary flow conditions is not treated in the present paper.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA/TR-790
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  • 8
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    Gas Jets (1944)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-15
    Beschreibung: A brief summary of the contents of this paper is presented here. In part I the differential equations of the problem of a gas flow in two dimensions is derived and the particular integrals by which the problem on jets is solved are given. Use is made of the same independent variables as Molenbroek used, but it is found to be more suitable to consider other functions. The stream function and velocity potential corresponding to the problem are given in the form of series. The investigation on the convergence of these series in connection with certain properties of the functions entering them forms the subject of part II. In part III the problem of the outflow of a gas from an infinite vessel with plane walls is solved. In part IV the impact of a gas jet on a plate is considered and the limiting case where the jet expands to infinity changing into a gas flow is taken up in more detail. This also solved the equivalent problem of the resistance of a gaseous medium to the motion of a plate. Finally, in part V, an approximate method is presented that permits a simpler solution of the problem of jet flows in the case where the velocities of the gas (velocities of the particles in the gas) are not very large.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1063 , Scientific Memoirs; 1-121
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  • 9
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    Progress in Interferometric Rayleigh Scattering to Measure Fluctuations Spectra of Velocity and Temperature in High Speed Flows (2020)
    In:  CASI
    Details
    Publikationsdatum: 2020-01-18
    Beschreibung: A new, spectrally-resolved, Rayleigh scattering setup at NASA Ames is further developed to measure fluctuations in velocity and temperature. Using a combination of a continuous-wave laser, a stabilized Fabry-Perot interferometer (FPI), an EMCCD camera, and a photo-multiplier tube, the setup was demonstrated to provide fairly accurate measurements of time-averaged velocity, temperature, density and spectrum of density fluctuations in a high-speed free jet (Panda & White, 2018). This paper describes further progress in fast measurement of the Rayleigh-Brillouin spectrum via a 16-anode linear-array of photo-multiplier tube and a multi-channel, photo-electron counter. Rayleigh scattered light from a 0.4mm long probe volume was directly imaged through the FPI and was imaged on the linear array. Synchronous photo-electron counting over a series of short, contiguous gates provided time-evolution of the fringes at a 10 kHz sampling rate. Sample spectra collected from a Mach 0.98 jet show spectral content floating on high noise-floor. Efforts to collect longer time series of data and different schemes of extracting velocity and temperature information are now in progress.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: AIAA 2020-0300 , ARC-E-DAA-TN76183 , AIAA Scitech 2020 Forum; Jan 06, 2020 - Jan 10, 2020; Orlando, FL; United States
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  • 10
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    CFD Predictions of Soot & CO Emissions Generated by a Partially-Fueled 9-Element Lean-Direct Injection Combustor (2020)
    In:  CASI
    Details
    Publikationsdatum: 2020-01-15
    Beschreibung: A study was undertaken to investigate the CO & soot emissions generated by a partially-fueled 9- element LDI (Lean-Direct Injection) combustor configuration operating in the idle range of jet engine conditions. In order to perform the CFD analysis, several existing soot/chemistry models were implemented into the OpenNCC (Open National Combustion Code). The calculations were based on a Reynolds-Averaged Navier Stokes (RANS) simulation with standard k-epsilon turbulence model, a 62- species jet-a/air chemistry, a 2-equation soot model, & a Lagrangian spray solver. A separate transport equation was solved for all individual species involved in jet-a/air combustion. In the test LDI configuration we examined, only five of the nine injectors were fueled with the major pilot injector operating at an equivalence ratio of near one and the other four main injectors operating at an equivalence ratio near 0.55. The calculations helped to identify several reasons behind the soot & CO formation in different regions of the combustor. The predicted results were compared with the reported experimental data on soot mass concentration (SMC) & emissions index of CO (EICO). The experimental results showed that an increase in either T3 and/or F/A ratio lead to a reduction in both EICO & SMC. The predicted results were found to be in reasonable agreement. However, the predicted EICO differed substantially in one test condition associated with higher F/A ratio.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: AIAA 2020-2088 , GRC-E-DAA-TN75696 , AIAA Scitech 2020 Forum; Jan 06, 2020 - Jan 10, 2020; Orlando, FL; United States
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  • 11
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    Profile Measurements During Cavitation (1944)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: One of the problems of modern cavitation research is the experimental determination of the wing loads on airfoils during cavitation. Such experiments were made on various airfoils with the support of the naval ministry at the Kaiser Wilhelm Institute for Flow Research at Goettingen.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1060 , Hydromechanical Problems of Ship Propulsion; May 18, 1932 - May 19, 1932; Hamburg; Germany
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  • 12
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    Heat Transfer in a Turbulent Liquid or Gas Stream (1944)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The,theory of heat.transfer from a solid body to a liquid stream could he presented previously** only with limiting assumptions about the movement of the fluid (potential flow, laminar frictional flow). (See references 1, 2, and 3). For turbulent flow, the most important practical case, the previous theoretical considerations did not go beyond dimensionless formulas and certain conclusions as to the analogy between the friction factor and the unit thermal conductance, (See references 4, 5, 6, and 7,) In order to obtain numerical results, an experimental treatment of the problem was resorted to, which gave rise to numerous investigations because of the importance of this problem in many branches of technology. However, the results of these investigations frequently deviate from one another. The experimental results are especially dependent upon the overall dimensions and the specific proportions of the equipment. In the present work, the attempt will be made to develop systematically the theory of the heat transfer and of the dependence of the unit thermal conductance upon shape and dimensions, using as a basis the velocity distribution for turbulent flow set up by Prandtl and Von Karman.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1068 , Zeitschrift fuer Angewandte Mathematik und Mechanik; 1; 4; 268-290
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  • 13
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    Theory of Heat Transfer in Smooth and Rough Pipes (1942)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The heat transfer accompanying turbulent flow in tubes has been treated by a new theory of wall turbulence, and a formula for smooth tubes has been derived which is asymptotic at Re approaches infinity. It agrees very well with the data available to date. The formula also holds for the flow along a flat plate if lambda is based on the velocity far away. For rough tubes, the unit conductance is shown to be a function of kv*/upsilon; the two empirical constants (delta(r), n) which appear in equation (52) cannot yet be determined because of lack of experimental data.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1037 , Forschung auf dem Gebiete des Ingenieurwesens, Bd. 11; 11; 4; 149-158
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  • 14
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    Heat Transfer Through Turbulent Friction Layers (1943)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The "general Prandtl number" Pr(exp 1) - A(sub q)/A Pr, aside from the Reynolds number determines the ratio of turbulent to molecular heat transfer, and the temperature distribution in turbulent friction layers. A(sub q) = exchange coefficient for heat; A = exchange coefficient for momentum transfer. A formula is derived from the equation defining the general Prandtl number which describes the temperature as a function of the velocity. For fully developed thermal boundary layers all questions relating to heat transfer to and from incompressible fluids can be treated in a simple manner if the ratio of the turbulent shear stress to the total stress T(sub t)/T in the layers near the wall is known, and if the A(sub q)/A can be regarded as independent of the distance from the wall. The velocity distribution across a flat smooth channel and deep into the laminar sublayer was measured for isothermal flow to establish the shear stress ratio T(sub t)/T and to extend the universal wall friction law. The values of T(sub t)/T which resulted from these measurements can be approximately represented by a linear function of the velocity in the laminar-turbulent transition zone. The effect of the temperature relationship of the material values on the flow near the wall is briefly analyzed. It was found that the velocity at the laminar boundary (in contrast to the thickness of the laminar layer) is approximately independent of the temperature distribution. The temperature gradient at the wall and the distribution of temperature and heat flow in the turbulent friction layers were calculated on the basis of the data under two equations. The derived formulas and the figures reveal the effects of the Prandtl number, the Reynolds number, the exchange quantities and the temperature relationship of the material values.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1047 , Zeitschrift fuer Angewandte Mathematik und Mechanik; 20; 6; 297-328
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  • 15
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    Heat Transfer and Hydraulic Flow Resistance for Streams of High Velocity (1943)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Problems of hydraulic flow resistance and heat transfer for streams with velocities comparable with acoustic have present great importance for various fields of technical science. Especially, they have great importance for the field of heat transfer in designing and constructing boilers.of the "Velox" type. In this article a description of experiments and their results as regards definition of the laws of heat transfer in differential form for high velocity air streams inside smooth tubes are given.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1054 , Journal of Technical Physics; 9; 9; 808-818
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  • 16
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    Periodic Heat Transfer at Small Pressure Fluctuations (1943)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The effect of cyclic gas pressure variations on the periodic heat transfer at a flat wall is theoretically analyzed and the differential equation describing the process and its solution for relatively. Small pressure fluctuations developed, thus explaining the periodic heat cycle between gas and wall surface. The processes for pure harmonic pressure and temperature oscillations, respectively, in the gas space are described by means of a constant heat transfer coefficient and the equally constant phase angle between the appearance of the maximum values of the pressure and heat flow most conveniently expressed mathematically in the form of a complex heat transfer coefficient. Any cyclic pressure oscillations, can be reduced by Fourier analysis to harmonic oscillations, which result in specific, mutual relationships of heat-transfer coefficients and phase angles for the different harmonics.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1048 , Forschung auf de Gebiete des Ingenieurwesens; 11; 2; 67-75
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  • 17
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    Pressure Distribution in Nonuniform Two-Dimensional Flow (1943)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: In an attempt to follow the time rate of change of the processes in turbulent flows by quantitative measurements the measurement of the pressure is often beset with insuperable difficulties for the reason that the speeds and hence the pressures to be measured are often very small. On the other hand, the measurement of very small pressures requires, at least, considerable time, so that the follow-up of periodically varying processes is as goad as impossible. In order to obviate these difficulties a method, suggested by Prof. Prandtl, has been developed by which the pressure distribution is simply determined from the photographic flow picture. This method is described and proved on a worked-out example. It was found that quantitatively very satisfactory results can be achieved.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1039 , Ingenieur-Archives; 6; 1; 34-50
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  • 18
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    Heat Transfer Over the Circumference of a Heated Cylinder in Transverse Flow (1943)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: A method for recording the local heat-transfer coefficients on bodies in flow was developed. The cylinder surface was kept at constant temperature by the condensation of vapor except for a narrow strip which is heated separately to the same temperature by electricity. The heat-transfer coefficient at each point was determined from the electric heat output and the temperature increase. The distribution of the heat transfer along the circumference of cylinders was recorded over a range of Reynolds numbers of from 5000 to 426,000. The pressure distribution was measured at the same time. At Reynolds numbers up to around 100,000 high maximums of the heat transfer occurred in the forward stagnation point at and on the rear side at 180C, while at around 80 the heat-transfer coefficient on both sides of the cylinder behind the forward stagnation point manifested distinct minimums. Two other maximums occurred at around 115 C behind the forward stagnation point between 170,000 and 426,000. At 426,000 the heat transfer at the location of those maximums was almost twice as great as in the forward stagnation point, and the rear half of the cylinder diffused about 60 percent of the entire heat, The tests are compared with the results of other experimental and theoretical investigations.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1050 , Forschung auf dem Gebiete des Ingenieurwesens; 12; 2; 65-73
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  • 19
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    Turbulent Friction in the Boundary Layer of a Flat Plate in a Two-Dimensional Compressible Flow at High Speeds (1943)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-11
    Beschreibung: In the present report an investigation is made on a flat plate in a two-dimensional compressible flow of the effect of compressibility and heating on the turbulent frictional drag coefficient in the boundary layer of an airfoil or wing radiator. The analysis is based on the Prandtl-Karman theory of the turbulent boundary later and the Stodola-Crocco, theorem on the linear relation between the total energy of the flow and its velocity. Formulas are obtained for the velocity distribution and the frictional drag law in a turbulent boundary later with the compressibility effect and heat transfer taken into account. It is found that with increase of compressibility and temperature at full retardation of the flow (the temperature when the velocity of the flow at a given point is reduced to zero in case of an adiabatic process in the gas) at a constant R (sub x), the frictional drag coefficient C (sub f) decreased, both of these factors acting in the same sense.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1053 , Report of the Central Aero-Hydrodynamical Institute, Moscow; Rept-321
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  • 20
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    The Theory of a Free Jet of a Compressible Gas (1944)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-11
    Beschreibung: In the present report the theory of free turbulence propagation and the boundary layer theory are developed for a plane-parallel free stream of a compressible fluid. In constructing the theory use was made of the turbulence hypothesis by Taylor (transport of vorticity) which gives best agreement with test results for problems involving heat transfer in free jets.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1058 , Report of the Central Aero-Hydrodynamical Inst., Moscow; Rept-377
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  • 21
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    Heat Transfer in the Turbulent Boundary Layer of a Compressible Gas at High Speeds (1942)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-11
    Beschreibung: The Reynolds law of heat transfer from a wall to a turbulent stream is extended to the case of flow of a compressible gas at high speeds. The analysis is based on the modern theory of the turbulent boundary layer with laminar sublayer. The investigation is carried out for the case of a plate situated in a parallel stream. The results are obtained independently of the velocity distribution in the turbulent boundar layer.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1032 , Rept-240
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  • 22
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    Radiator Design and Installation - II, Special Report (1942)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: A mathematical analysis of radiator design has been made. The volume of the radiator using least total power has been expressed in a single formula which shows that the optimum radiator volume is independent of the shape of the radiator and which makes possible the construction of design tables that give the optimum radiator volume per 100-horsepower heat dissipation as a function of the speed, of the altitude, and of one parameter involving characteristics of the airplane. Although, for a given set of conditions, the radiator volume using the least total power is fixed, the frontal area, or the length of the radiator needs to be separately specified in order to satisfy certain other requirement such as the ability to cool with the pressure drop available while the airplane is climbing. In order to simplify the specification for the shape of the radiator and in order to reduce the labor involved in calculating the detailed performance of radiators, generalized design curves have been developed for determining the pressure drop, the mass flow of air, and the power expended in overcoming the cooling drag of a radiator from the physical dimensions of the radiator. In addition, a table is derived from these curves, which directly gives the square root of the pressure drop required for ground cooling as a function of the radiator dimensions, of the heat dissipation and of the available temperature difference. Typical calculations using the tables of optimum radiator volume and the design curves are given. The jet power that can be derived from the heated air is proportional to the heat dissipation and is approximately proportional to the square of the airplane speed and to the reciprocal of the absolute temperature of the atmosphere. A table of jet power, per 100 horsepower of heat dissipation at various airplane speeds and altitudes is presented.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-ACR-213 , NACA-SR-213
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  • 23
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    Comparison of Intercooler Characteristics (1941)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: A method is presented of comparing the performance, weight, and general dimensional characteristics of inter-coolers. The performance and dimensional characteristics covered in the comparisons are cooling effectiveness, pressure drops and weight flows of the charge and cooling air, power losses, volume, frontal area, and width. A method of presenting intercooler data is described in which two types of charts are plotted; (1) A performance chart setting forth all the important characteristics of a given intercooler and (2) a replot of these characteristics for a number of intercoolers intended to assist in making a selection to satisfy a given set of installation conditions. The characteristics of commercial intercoolers obtained from manufacturers' data and of some computed designs are presented on this basis. A standard test procedure and instrumentation are suggested whereby comparable data may be obtained by different testing organizations.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-SR-192
    Format: application/pdf
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  • 24
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    Multigrid Preconditioning for a Space-Time Spectral-Element Discontinuous-Galerkin Solver (2020)
    In:  CASI
    Details
    Publikationsdatum: 2020-01-24
    Beschreibung: In this work we examine a multigrid preconditioning approach in the context of a high- order tensor-product discontinuous-Galerkin spectral-element solver. We couple multigrid ideas together with memory lean and efficient tensor-product preconditioned matrix-free smoothers. Block ILU(0)-preconditioned GMRES smoothers are employed on the coarsest spaces. The performance is evaluated on nonlinear problems arising from unsteady scale- resolving solutions of the Navier-Stokes equations: separated low-Mach unsteady ow over an airfoil from laminar to turbulent ow. A reduction in the number of ne space iterations is observed, which proves the efficiency of the approach in terms of preconditioning the linear systems, however this gain was not reflected in the CPU time. Finally, the preconditioner is successfully applied to problems characterized by stiff source terms such as the set of RANS equations, where the simple tensor product preconditioner fails. Theoretical justification about the findings is reported and future work is outlined.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: ARC-E-DAA-TN76312 , AIAA SciTech 2020; Jan 06, 2020 - Jan 10, 2020; Orlando, FL; United States
    Format: application/pdf
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  • 25
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    Experimental Heat Transfer Supporting Simulated Water Well Performance on Mars (2020)
    In:  CASI
    Details
    Publikationsdatum: 2020-01-23
    Beschreibung: Favorable indications of massive quantities of water on Mars have initiated studies of potential changes to human Mars missions. Using a technique known as a Rodriguez Well to melt the ice, store the resulting water in a subsurface ice cavity until needed, and then pump water to the surface for use is one potential means to effect these changes. A computer simulation of the Rodriguez Well in a terrestrial environment is one of the engineering tools being used to characterize the performance of this type of well on Mars. An experiment at the NASA Johnson Space Center is gathering data for convective heat transfer and evaporation rates at Mars surface conditions so that this computer simulation can be properly modified to predict performance on Mars. While quantitative results await processing, tests have indicated that a pool of water can be maintained at 1C to 2 C while at Mars surface temperatures and pressures.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: JSC-E-DAA-TN74283 , International Conference on Mars Polar Science and Exploration; Jan 13, 2020 - Jan 17, 2020; Tierr del Fuego; Argentina
    Format: application/pdf
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  • 26
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    The Compressible Potential Flow Past Elliptic Symmetrical Cylinders at Zero Angle of Attack and with No Circulation (1942)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-15
    Beschreibung: For the tunnel corrections of compressible flows those profiles are of interest for which at least the second approximation of the Janzen-Rayleigh method can be applied in closed form. One such case is presented by certain elliptical symmetrical cylinders located in the center of a tunnel with fixed walls and whose maximum velocity, incompressible, is twice the velocity of flow. In the numerical solution the maximum velocity at the profile and the tunnel wall as well as the entry of sonic velocity is computed. The velocity distribution past the contour and in the minimum cross section at various Mach numbers is illustrated on a worked out-example.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1030 , Luftfahrtforschung; 18; 9; 311-316
    Format: application/pdf
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  • 27
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    Preliminary Tests in the NACA Tank to Investigate the Fundamental Characteristics of Hydrofoils (1940)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-26
    Beschreibung: This preliminary investigation was made to study the hydrodynamic properties and general behavior of simple hydrofoils. Six 5- by 30-inch plain, rectangular hydrofoils were tested in the NACA tank at various speeds, angles of attack and depths below the water surface. Two of the hydrofoils had sections representing the sections of commonly used airfoils, one had a section similar to one developed Guidoni for use with hydrofoil-equipped seaplane floats, and three had sections designed to have constant chordwise pressure distributions at given values of the lift coefficient for the purpose of delaying the speed at which cavitation begins. The experimental results are presented as curves of the lift and drag coefficients plotted against speed for the various angles of attack and depths for which the hydrofoils were tested. A number of derived curves are included for the purpose of better comparing the characteristics of the hydrofoils and to show the effects of depth. Several representative photographs show the development of cavitation on the the upper surface of the hydrofoils. The results indicate that properly designed hydrofoil sections will have excellent characteristics and that the speed at which cavitation occurs may be delayed to an appreciable extent by the use of suitable sections.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-SR-158
    Format: application/pdf
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  • 28
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    The Navier-Stokes Stress Principle for Viscous Fluids (1942)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-16
    Beschreibung: The Navier-Stokes stress principle is checked in the light of Maxwell's mechanism of friction and in connection herewith the possibility of another theorem is indicated. The Navier-Stokes stress principle is in general predicated upon the conception of the plastic body. Hence the process is a purely phenomenological one, which Newton himself followed with his special theorem for one-dimensional flows. It remained for Maxwell to discover the physical mechanism by which the shear inflow direction is developed: According to it, this shear is only 'fictitious' as it merely represents the substitute for a certain transport on macroscopic motion quantity, as conditioned by Brown's moiecular motion and the diffusion, respectively. It is clear that this mechanism is not bound to the special case of the one-dimensioilal flows, but holds for any flow as expression of the diffusion, by which a fluid differs sharply from a plastic body. If it is remembered, on the other hand, that the cause of the stresses on the plastic body lies in a certain cohesion of the molecules, it appears by no means self evident that this difference in the mechanism of friction between fluid and plastic body should not prevail in the stress principle as well, although it certainly is desirable in any case, at least subsequently, to establish the general theorem in the sense of Maxwell. Actually, a different theorem is suggested which, in contrast to that by Navier-Stokes, has the form of an unsymmetrical matrix. Without anticipating a final decision several reasons are advanced by way of a special flow which seem to affirm this new theorem. To make it clear that the problem involved here still awaits its final solution, is the real purpose behind the present article.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1029 , Luftfahrtforschung; 18; 9; 327-330
    Format: application/pdf
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  • 29
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    The Heat Transfer to a Plate in Flow at High Speed (1943)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The heat transfer in the laminar boundary layer of a heated plate in flow at high speed can be obtained by integration of the conventional differential equations of the boundary layer, so long as the material values can be regarded as constant. This premise is fairly well satisfied at speeds up to about twice the sonic speed and at not excessive temperature rise of the heated plate. The general solution of the equation includes Pohlhausen's specific cases of heat transfer to a plate at low speeds and of the plate thermometer. The solution shows that the heat transfer coefficient at high speed must be computed with the same equation as at low speed, when it is referred to the difference of the wall temperature of the heated plate in respect to its "natural temperature." Since this fact follows from the linear structure of the differential equation describing the temperature field, it is equally applicable to the heat transfer in the turbulent boundary layer.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: NACA-TM-1045 , Forschung; 11; 3; 116-124
    Format: application/pdf
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  • 30
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    Modeling Heatshield Erosion Due to Dust Particle Impacts for Martian Entries (2020)
    In:  CASI
    Details
    Publikationsdatum: 2020-01-18
    Beschreibung: Heatshield design for spacecraft entering the atmosphere of Mars may be affected by the presence of atmospheric dust. Particle impacts with sufficient kinetic energy can cause spallation damage to the heatshield that must be estimated. The dust environment in terms of particle size distribution and number density can be inferred from ground-based or atmospheric observations at Mars. Using a Lagrangian approach, the particle trajectories through the shock layer can be computed using a set of coupled ordinary differential equations. The dust particles are small enough that non-continuum effects must be accounted for when computing the drag coefficient and heat transfer to the particle surface. Surface damage correlations for impact crater diameter and penetration depth are presented for fused-silica, AVCOAT, Shuttle tiles, cork, and Norcoat Lige. The cork and Norcoat Lige correlations are new and were developed in this study. The modeling equations presented in this paper are applied to compute the heatshield erosion due to dust particle impacts on the ExoMars Schiaparelli entry capsule during dust storm conditions.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: ARC-E-DAA-TN76672 , AIAA Scitech 2020 Forum; Jan 06, 2020 - Jan 10, 2020; Orlando, FL; United States
    Format: application/pdf
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  • 31
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    Modeling Heatshield Erosion due to Dust Particle Impacts for Martian Entries (2020)
    In:  CASI
    Details
    Publikationsdatum: 2020-01-17
    Beschreibung: Heatshield design for spacecraft entering the atmosphere of Mars may be affected by the presence of atmospheric dust. Particle impacts with sufficient kinetic energy can cause spallation damage to the heatshield that must be estimated. The dust environment in terms of particle size distribution and number density can be inferred from ground-based or atmospheric observations at Mars. Using a Lagrangian approach, the particle trajectories through the shock layer can be computed using a set of coupled ordinary differential equations. The dust particles are small enough that non-continuum effects must be accounted for when computing the drag coefficient and heat transfer to the particle surface. Surface damage correlations for impact crater diameter and penetration depth are presented for fused-silica, AVCOAT, Shuttle tiles, cork, and Norcoat Lige. The cork and Norcoat Lige correlations are new and were developed in this study. The modeling equations presented in this paper are applied to compute the heatshield erosion due to dust particle impacts on the ExoMars Schiaparelli entry capsule during dust storm conditions.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: AIAA 2020-0254 , ARC-E-DAA-TN75805 , AIAA Scitech 2020 Forum; Jan 06, 2020 - Jan 10, 2020; Orlando, FL; United States
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  • 32
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    Insight Aerothermal Environment Assessment (2020)
    In:  CASI
    Details
    Publikationsdatum: 2020-01-17
    Beschreibung: The Mars Interior Exploration using Seismic Investigations, Geodesy and Heat Transport (InSight) spacecraft, which successfully touched down on the planet surface on November 26, 2018, was proposed as a near build-to-print copy of the Mars Phoenix vehicle to reduce the overall cost and risk of the mission. Since the lander payload and the atmospheric entry trajectory were similar enough to those of the Phoenix mission, it was expected that the Phoenix thermal protection material thickness would be sufficient to withstand the entry heat load. However, allowances were made for increasing the heatshield thickness because the planned spacecraft arrival date coincided with the Mars dust storm season. The aftbody Thermal Protection System (TPS) components were not expected to change. In a first for a US Mars mission, the aerothermal environments for InSight included estimates of radiative heat flux to the aftbody from the wake. The combined convective and radiative heat fluxes were used to determine if the as-flown Phoenix thermal protection system (TPS) design would be sufficient for InSight. Although the radiative heat fluxes on the aftbody were predicted to be comparable to, or even higher than the local convective heat fluxes, all analyses of the aftbody TPS showed that the design would still be adequate. Aerothermal environments were computed for the vehicle from post-flight reconstruction of the atmosphere and trajectory and compared.
    Schlagwort(e): Fluid Mechanics and Thermodynamics
    Materialart: ARC-E-DAA-TN76667 , AIAA SciTech 2020; Jan 06, 2020 - Jan 10, 2020; Orlando, FL; United States
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  • 33
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    A Study to determine the accuracy of satellite measurements for the salinity pattern and surface temperature of Persian Gulf using statistical method (2020)
    Details
    Publikationsdatum: 2021-05-19
    Beschreibung: The aim of this paper is to determine the sea surface salinity (SSS) and temperature (SST) of Persian Gulf by using the AMSU-B sensor data of NOAA-16 satellite. A multiple linear regression method was used by statistical computing software R on AMSU-B data and in-situ data. Based on the results, the correlation coefficient (R2) for salinity and temperature was 0.85 and 0.94, respectively. Also, the Root Mean Square Error (RMSE) between satellite and ‘in-situ’ data are 0.045 psu for SSS and 0.12 for temperature. This indicates that in this study the AMSU-B satellite data for determining the salinity pattern and surface temperature is accurate enough.
    Beschreibung: Published
    Schlagwort(e): Salinity ; Temperature ; Satellite ; Surface ; Ecology
    Repository-Name: AquaDocs
    Materialart: Journal Contribution , Refereed
    Format: pp.213-217
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  • 34
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    Kent estuary survey 18th August 1981 (2021)
    North West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11098 | 1256 | 2013-04-03 15:27:57 | 11098 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: This is the Kent estuary survey 18th July 1981 produced by the North West Water Authority in 1981. The report focuses on a tidal cycle survey carried out on the Kent estuary on the 18th August, 1981. The chemical water quality at Arnside Pier and at New Barns was, on the whole, acceptable. However, samples taken downstream of the outfall at low water for total coliforms and E. coli were all above the EEC mandatory level whilst those for faecal streptococci were all above the guideline value. This document shows chemical and bacteriological data analysed at Kent estuary such chloride, dissolved oxygen, BOD, ammonia, nitrate, phosphate, total coliforms, E. coli and Faecal streptococci.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + appendices
    Schlagwort(e): Ecology ; Limnology ; Management ; England ; Kent estuary ; Arnside ; Inland waters ; Estuary ; Environmental survey ; Water quality ; Environmental assessment ; Bathing waters
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 18
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  • 35
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    River Eden RHS and geomorphology evaluation. Final report October 2001 (2021)
    Environment Agency | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11096 | 1256 | 2013-04-03 15:31:02 | 11096 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: This is the River Eden RHS and geomorphology evaluation: Final report October 2001 produced by the Environment Agency North West in 2001. This report analysed the River Habitat Survey (RHS) and geomorphology data to evaluate the level of habitat quality and the geomorphological characteristics of the River Eden and sub-catchments. RHS data and geomorphological assessment data was collected within the study areas by CEH and Fluvial Environmental Services Ltd. The River Eden and its sub-catchments are being considered as a Special Area for Conservation (SAC) due to the presence of habitat types and species, which are rare or threatened within Europe. The purpose of the project is to provide an overview of the state of the catchment in terms of river habitats and geomorphological processes in order to aid the derivation of sound management for this proposed SAC.The aim of this report was to determine the state of the environment within the Eden and sub-catchments and identify the main pressures on the system in order to derive sound management options.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Ecology ; Limnology ; Management ; England ; River Eden ; Inland waters ; Rivers ; RHS ; Environmental assessment ; Water quality ; Nature conservation ; Eden Rivers Trust ; English Nature
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 133
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  • 36
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    Report on fisheries invertebrate survey of the Groove Beck,Thornsgill Beck,Troutbeck system (2021)
    Environment Agency North West | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11101 | 1256 | 2013-04-03 15:27:14 | 11101 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-28
    Beschreibung: This is the Report on fisheries invertebrate survey of the Groove Beck, Thornsgill Beck and Troutbeck system produced by the Environment Agency North West in 1997. In 1996 the National Rivers Authority (NRA) report on the 1992 strategic stock assessment for the Upper Derwent catchment Jane Atkins recommended that should subsequent electrofishing show continued low densities, a survey of the invertebrate fauna should be undertaken to assess the food availability for salmonids, in order that lack of food could be ruled out as a contributory factor in their poor breeding success. Additionally the survey looked at the substrate to try to determine whether the bed type might actually be unsuitable for spawning, especially in view of the previously mentioned silt inputs.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + tables
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; England ; Groove Beck ; Thornsgill Beck ; Trout Beck ; Inland waters ; Rivers ; Environmental survey ; Freshwater fishes ; Migratory species ; Invertebrate larvae
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 4
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  • 37
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    Report of 1996 survey of Trout Beck with particular reference to spawning gravel quality and invertebrates as a food source for salmonids (2021)
    Environment Agency | Carlisle, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11100 | 1256 | 2013-04-03 15:27:32 | 11100 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-28
    Beschreibung: This is the Report of 1996 survey of Trout Beck with particular reference to spawning gravel quality and invertebrates as a food source for salmonids produced by the Environment Agency North West. Whilst the main River Derwent is quite a high profile salmon fishery, Trout Beck is not a significant fishery in its own right, but serves to maintain the genetic integrity of the wild populations of trout and salmon in the catchment by providing a unique habitat. This survey addressed the invertebrate food availability, and additionally looked at the substrate to try to determine whether the bed type might actually be unsuitable for spawning, especially in view of the previously mentioned silt inputs.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + 1 map and 1 figure
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; England ; Trout Beck ; Inland waters ; Rivers ; Environmental survey ; Freshwater fishes ; Migratory species ; Invertebrate larvae
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 8
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  • 38
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    Ashburn (Dart catchment) fisheries survey 1978 (2021)
    Unpublished | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11141 | 1256 | 2013-04-11 16:54:17 | 11141 | Environment Agency, UK (Freshwater Biological Association)
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    Publikationsdatum: 2021-06-28
    Beschreibung: This is the Ashburn (Dart catchment) fisheries survey 1978 report produced by South West Water Authority in 1978. This report focuses on an exploratory survey to determine the population and distribution of all fish species and in particular salmonid species of the Ashburn stream. This survey is primarily intended for future reference on completion of the proposed Flood Alleviation Scheme of the Ashburn where it passes through the centre of Ashburton. Three sections were electro fished using D.C. Current Sections were chosen as easily accessible and through their relation in position to the intended scheme.
    Beschreibung: Environment Agency Archives South West
    Beschreibung: + map
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; England ; River Dart catchment ; Ashburn stream ; Inland waters ; Freshwater fish ; Migratory species ; Fish population ; Population size distribution ; Fish catch statistics ; Fishery data ; Fishery surveys
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 5
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  • 39
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    Biological survey: River Teign and tributaries with references to the discharge of ball clay wastes (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11139 | 1256 | 2013-04-11 16:54:51 | 11139 | Environment Agency, UK (Freshwater Biological Association)
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    Publikationsdatum: 2021-06-28
    Beschreibung: This is the Biological survey of River Teign and tributaries with references to the discharge of ball clay wastes, document produced by South West Water Authority in 1973. This report focuses on on-site assessment of the benthic macro-invertebrates of the lower River Teign, River Bovey, Ugbrooke Stream and Blatchford Brook was undertaken on 19th and 22nd August 1977 to assess the effects of discharges from ball clay mining premises. Inspection of aquatic fauna in the field is of necessity, less extensive than laboratory identification of sorted samples, so that the resulting data underestimates the water quality. This is more pronounced in the Chandler Score than in the Trent Biotic Index which does not take account of species abundance. Chandler should thus be interpreted by the trends described rather than by absolute values calculated.
    Beschreibung: Environment Agency Archives South West
    Beschreibung: + tables and maps
    Schlagwort(e): Ecology ; Limnology ; Pollution ; England ; River Teign ; Inland waters ; Invertebrates ; Environmental assessment ; Freshwater pollution ; Water quality ; Fishery surveys
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 2
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  • 40
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    Biological survey of the River Teign and tributaries, with reference to the effect of ball clay discharges (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11145 | 1256 | 2013-04-11 16:53:46 | 11145 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-28
    Beschreibung: This is the Biological survey of the River Teign and tributaries, with reference to the effect of ball clay discharges report produced by South West Water Authority in 1979. A survey of the macroinvertebrate riffle fauna in the Ball Clay mining area of the Bovey Basin, following a period of low rainfall, indicated that the River Bovey and the River Teign between Chudleigh and Teign Bridge, Newton Abbot were of good quality. Further downstream, the R. Teign and the lower reaches of the Ugbrooke Stream were identified as being of doubtful quality with the discharge from ECC Broadway continuing to give cause for concern.
    Beschreibung: Environment Agency Archives South West
    Beschreibung: + tables, figures and appendices
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; England ; River Teign catchment ; Inland waters ; Fishery surveys ; Invertebrate larvae ; Freshwater pollution ; Water quality
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 5
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  • 41
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    Glossoma intermedium survey. Scotland, April 5th to April 10th 2012 (2021)
    Riverfly Partnership | London, UK
    In:  http://aquaticcommons.org/id/eprint/11162 | 1256 | 2013-04-23 18:33:59 | 11162 | Freshwater Biological Association
    Details
    Publikationsdatum: 2021-06-28
    Beschreibung: The British Glossomatidae contains seven species, split between the genera Glossosoma, Agapetus and Synagapetus. One species, Glossosoma intermediumhas not been recorded in England since 2003. This was found in a side stream of Hayeswater gill in the Lake District. The main purpose of this survey was to try and locate and record Glossosoma intermedium and was a follow up to a similar survey we carried out in the Glennshee area of Scotland during April 2011. Additionally, as in the 2011 survey it also made sense that while looking for the larvae, pupae and adults of Glossosoma intermediumwe could also record other species of caddisfly (Trichoptera), mayfly (Ephemeroptera) and stonefly (Plecoptera).
    Schlagwort(e): Ecology ; Limnology ; Scotland ; New records ; Trichoptera ; Biological sampling ; Trichoptera ; Freshwater surveys ; Taxonomy
    Repository-Name: AquaDocs
    Materialart: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 1-15
    Format: 6
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  • 42
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    Eighth Deep-Sea Biology Symposium, Monterey, California 1997: abstracts (2021)
    Monterey Bay Aquarium Research Institute | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/10614 | 8 | 2015-04-29 21:11:23 | 10614
    Details
    Publikationsdatum: 2021-06-27
    Schlagwort(e): Biology ; Ecology
    Repository-Name: AquaDocs
    Materialart: book
    Format: application/pdf
    Format: application/pdf
    Format: 161
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  • 43
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    The Coleopteran fauna of exposed riverine sediments on the River Dane, Cheshire: A survey report (2021)
    Environment Agency | Birmingham, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10615 | 1256 | 2013-04-03 15:24:53 | 10615 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: This is the Coleopteran Fauna of ERS on the river Dane, Cheshire: a survey report produced by the Environment Agency in 2003. A comprehensive survey of the Exposed Riverine Sediment (ERS) on the River Dane, Cheshire was undertaken between mid-April and mid-June 2003. 6 locations were selected and subsequently examined to determine the importance of the constituent invertebrate fauna. Appropriate sampling techniques (i.e. pitfall trapping, hand searching and excavations) were directed towards the target group (Coleoptera). All adults from the chosen taxa were identified to species level. The relative value of the fauna was assessed using species richness, conservation status, fidelity score and a site quality index.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + appendices
    Schlagwort(e): Ecology ; Limnology ; England ; Cheshire ; River Dane ; Inland waters ; Rivers ; Freshwater fishes ; Invertebrate larvae ; ERS ; Environmental assessment ; Water quality ; Species richness ; Conservation status ; Fidelity score ; Site Quality Index
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 29
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  • 44
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    Survey of the lesser silver water beetle Hydrochara caraboides in Cheshire (2021)
    English Nature | Shropshire, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10617 | 1256 | 2013-03-29 14:22:02 | 10617 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: This is the report on the Survey of the Lesser Silver Water Beetle Hydrochara caraboides in Cheshire 1997 by the English Nature Research Reports. The three surveyed areas were the ponds at Reaseheath, Mickle Trafford and Brookhouse Farm.The report goes through the method of survey and individual results for each location/pond, aspects of the breeding sites considered favourable to Hydrochara caraboides as depth, vegetation, predators and prey species, surrounding land. It comes with suggestions for further work and appendixes. Appendix A contains tabulated lists of plants and invertebrates found in the various ponds, Appendix B shows grid references and a brief description of ponds at Brookhouse Farm, pond diagrams are plotted in Appendix C.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Ecology ; Limnology ; England ; Reaseheath ; Mickle Trafford ; Brookhouse Farm ; Hydrochara caraboides ; Silver water beetle ; Pond ; Survey ; Breeding sites ; Sampling
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 28
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  • 45
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    Additional crayfish survey of Checkley Brook, Hollywood End Brook and Black Brook (Goyt) 1999 (2021)
    Environment Agency | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10619 | 1256 | 2013-03-29 14:19:49 | 10619 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: This is the report on the Additonal Crayfish Survey of Checkley Brook, Hollywood End Brook and Black Brook from 1999 by the Environment agency. The aim of the 1999 survey was to obtain a more complete picture of the crayfish distribution in those areas.It contains sections on the sampling methodology which followed the sampling done in 1998, the results of the sampling indicating the species of crayfish occurring in the sampling areas and some discussion and conclusions for each area. The appendix I contains maps locating the sampling points and past records. The appendix II contains detailed information of the sampling points.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + appendices
    Schlagwort(e): Ecology ; Environment ; Limnology ; England ; Checkley Brook ; Hollywood ; End Brook ; Black Brook ; Crayfish ; Survey ; Crayfish distribution ; Crayfish species ; Sampling
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 46
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    Visual survey of exposed riverine sediments (Ers) in the Dane, Weaver and Bollin catchments (2021)
    Environment Agency | Birmingham, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10616 | 1256 | 2013-04-03 15:24:38 | 10616 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: This is the Visual survey ERS Dane, Weaver & Bollin Catchments produced by the Environment Agency in 2005. Visual surveys of the River Dane downstream of the confluence with the Swettenham Brook, the River Weaver, and the River Bollin catchment in the EA Northwest South area of England were undertaken between 3rd and 9th February 2005 with the aim of identifying the spatial distribution and relative quality of exposed Riverine sediments (ERS). The potential value of these ERS in terms of likely habitat quality for ERS invertebrate communities was determined by recording a suite of appropriate environmental variables. Following an initial cartographical analysis of reaches likely to contain ERS, tens of kilometres of riverbank were inspected and 67 areas of ERS were selected for detailed visual survey. Site characteristics ranged widely both between and within catchments, with habitat quality ranging from poor to very high.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Ecology ; Limnology ; England ; Cheshire ; River Dane ; River Weaver ; River Bollin ; Inland waters ; Rivers ; Invertebrate larvae ; ERS ; Environmental assessment ; Water quality
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 63
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  • 47
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    Crayfish survey of the Weaver, Dane, Goyt and Etherow catchments (2021)
    Environment Agency | Manchester, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10618 | 1256 | 2013-03-29 14:19:31 | 10618 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: This is the report on the Crayfish Survey of the Weaver, Dane, Goyt and Etherow catchments from 1998 by the Environment Agency. The aims of this report are: Firstly, to present the findings of the crayfishsurvey and details of the sites visited. Secondly to present the information on distribution maps with past records so that the current status can be seen and finally to use this information so that recommendations for the conservation of native crayfish can be made in accordance with the national action plan for this species and the Environment Agency’s Species Management Programme.The report contains sections on background, going through legislation, distribution and requirements of both native and non-native crayfish. Sections on methodology, results and discussion, conclusion and recommendations.The appendix I contains maps showing the sampling points locations. Details of sampling sites are summarized in appendix II. Appendix III contains previous crayfish records and Appendix IV shows the field data recording form. Finally, a collection of photographs are displayed in appendix V.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + appendices
    Schlagwort(e): Ecology ; Limnology ; Management ; England ; Weaver ; Dane ; Goyt ; Etherow ; Catchment ; Crayfish ; Survey ; Crayfish distribution ; Crayfish species ; Sampling
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 18
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  • 48
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    River Leith fluvial aufit. Final project report (2021)
    Lancaster University | Lancaster, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11094 | 1256 | 2013-03-29 14:14:20 | 11094 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: This is the River Leith fluvial audit: Final project report produced by Lancaster University in 1998. Freeze cores extracted from the upper and lower ends of River Leith illustrate that the bed is highly compacted in the downstream reach. Fine material is locally derived from bedrock at depths of only 32 cms into the bed and in one core fine material is 66% of the extracted core. Levels of fines that are believed to be detrimental to fish are put at 20 to 30%. Reduced flow and stream power from water abstraction may lead to a greater infiltration of fine material if gravels are not regularly flushed through with flood flows. Infiltration of fine material can lead to river bed compaction and concretion. A small abstraction may have no effect on the morphology of a river if the reduced discharge is within the normal range of flows experienced. However if the impact on flows is small it is still possible that fine sediment problems will develop progressively and the effects may not be noticed for several years.
    Beschreibung: Environment Agency Archives North West
    Schlagwort(e): Ecology ; Limnology ; Management ; England ; River Leith ; Inland waters ; Rivers ; Freshwater fish ; Migratory species ; Sediment cores ; Fine material ; Pollution effects ; Environmental assessment ; Water quality
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 17
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  • 49
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    Kent estuary survey 8th July 1980 (2021)
    North West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11097 | 1256 | 2013-04-03 15:28:09 | 11097 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-27
    Beschreibung: This is the Kent estuary survey 8th July 1980 produced by the North West Water Authority in 1980. This survey was carried out on the Kent Estuary on the 8th July, 1980 during the period 3h hours before to 1.5 hours after low water. The chemical water quality in the vicinity of Arnside was found, in general, to be good. The E. coli counts were found to be at or below the E E C mandatory value for bathing waters. Downstream of the Arnside outfall the E coli counts were generally above the E E C mandatory value, the counts getting higher at and after low water. B O D values also increased at low water though ammonia and phosphate (except for 1 sample) concentrations were low. The total coliform counts both at Arnside and below the outfall were always above the E E C mandatory level (except for 2 samples).
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + appendices
    Schlagwort(e): Ecology ; Limnology ; Management ; England ; Kent estuary ; Arnside ; Inland waters ; Estuary ; Environmental survey ; Water quality ; Environmental assessment ; Bathing waters
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 11
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  • 50
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    The Kent estuary 1992 surveys. Summary of results (2021)
    National Rivers Authority North West | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11099 | 1256 | 2013-04-03 15:27:43 | 11099 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-28
    Beschreibung: This is the Kent estuary 1992 surveys: Summary of results produced by the National Rivers Authority in 1993. The report summarises routine and baseline water quality surveys carried out on the Kent estuary during 1992. Baseline surveys are designed to respond to regional, national, and European requirements. During 1992 baseline surveys were carried out in June and December. Unfortunately, in June, samples could only be taken from stations 3, 7 and 8. For ease of interpretation the results have been presented in graph form, including the maximum and minimum parameter concentration and the appropriate Environmental Quality Standards (EQS). The parameters measured in this survey were physical parameters (temperature, BOD, dissolved oxygen, Ph, salinity, conductivity); nutrients (ammonia, phosphate, and nitrate); metals (Mercury, Nickel, Arsenic, Cadmium, Chromium, Cooper, Boron, and Zinc) and organic compounds.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: + tables, figures and appendices
    Schlagwort(e): Ecology ; Limnology ; Management ; England ; Kent estuary ; Arnside ; Estuary ; Coastal waters ; Environmental survey ; Water quality ; Environmental assessment ; Bathing waters ; EQS
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 2
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  • 51
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    Fish communities in rivers to be affected by Roadford Reservoir (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11138 | 1256 | 2013-04-11 16:54:40 | 11138 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-28
    Beschreibung: This is the Fish communities in rivers to be affected by Roadford Reservoir report produced by South West Water Authority in 1978. Surveys were carried, out on the Rivers Wolf, Thrushel, Lew and Lumburn, which are likely to be affected directly and indirectly by the construction and use of Roadford Reservoir. Of the upper reaches of three rivers to be affected directly by water releases, two were found to support abundant stocks of salmon and trout, and the third was found to contain abundant stocks of trout and eels. The River Thrushel will be affected indirectly and in this river salmon and trout stocks were present in slightly lower abundance than in others. Population estimates, densities, mean lengths and approximate biomass values were calculated. Other species were present in all rivers, usually in great abundance.
    Beschreibung: Environment Agency Archives South West
    Beschreibung: + tables and maps
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; England ; River Teign ; Inland waters ; Freshwater fish ; Migratory species ; Fish population ; Population size distribution ; Fish catch statistics ; Fishery data ; Fishery surveys
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 6
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  • 52
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    River Bray fisheries survey 1978-80 (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11148 | 1256 | 2013-04-11 16:53:15 | 11148 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-28
    Beschreibung: This is the River Bray fisheries survey 1978-80 report produced by South West Water Authority in 1981. This report aims to assess the possible effects of new abstraction conditions at Leahamford on the fish communities of the River Bray, surveys have been carried out in 1978, 197S and 1980. Field work was done in August and September each; year. Abstraction began in summer 1979. On the River Bray one site upstream and three downstream of Leahamford were chosen. One site on the River Mole was surveyed and is considered as a control site, being not directly affected by abstraction. The sketch map shows these sites in relation to Leahamford.
    Beschreibung: Environment Agency Archives South West
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; England ; River Bray ; Inland waters ; Freshwater fish ; Migratory species ; Fish population ; Population size distribution ; Fish catch statistics ; Fishery data ; Fishery surveys
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 7
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  • 53
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    Fisheries survey of the River Taw 1977 (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11146 | 1256 | 2013-04-11 16:53:38 | 11146 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publikationsdatum: 2021-06-28
    Beschreibung: This is the Fisheries survey of the River Taw 1977 report produced by South West Water Authority in 1978. The upper reaches of the River Taw were severely polluted in October 1975 and there was widespread fish mortality. A survey was carried out to assess the recovery of salmonid stocks in the affected areas. Salmon showed a rapid recovery and trout have also recovered well. Both species have been assisted by widespread stocking. Several other species were present. Salmonid and total fish biomass was high. Further stocking of salmon is not recommended and it is also suggested that stocking with trout should be discontinued.
    Beschreibung: Environment Agency Archives South West
    Schlagwort(e): Ecology ; Fisheries ; Limnology ; England ; River Taw ; Inland waters ; Freshwater fish ; Migratory species ; Fish population ; Population size distribution ; Fish catch statistics ; Fishery data ; Fishery surveys ; Freshwater pollution
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 11
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  • 54
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    The Environment Agency/DEFRA Evidence and Measures Project: Practical Solutions - Moston Brook (2021)
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11164 | 1256 | 2013-09-03 13:07:23 | 11164 | Environment Agency, UK (Freshwater Biological Association)
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    Publikationsdatum: 2021-06-28
    Beschreibung: This is the final presentation from the Moston Brook Evidence and Measures project which ran from September 2012 to March 2013. Moston Brook water body is part of the River Irwell Pilot Catchment and the objective of the project was to devise reliable measures (actions) which were based on existing evidence and that could be implemented in years 2 and 3 by the Environment Agency and its partner to help meet Water Framework Directive (WDF) requirements and community aspirations. The presentation summarises the main suspected causes of WDF failure, the evidence for this, the main causes for failure in the sub-catchments resulting from the evidence found, and identifies measures to carry out, which will address the WDF failures and improve the quality of the water. This presentation can be used to inform others on how to improve the water quality of Moston Brook, and also to support other similar initiatives.
    Beschreibung: Environment Agency Archives North West
    Beschreibung: Copy of 20 powerpoint slides in 10 page document.
    Schlagwort(e): Ecology ; Limnology ; Pollution ; UK ; England ; North West ; Rivers ; Environmental assessment ; Water management ; Freshwater pollution ; Water quality ; River Irwell ; water@leeds
    Repository-Name: AquaDocs
    Materialart: conference_item , FALSE
    Format: application/pdf
    Format: application/pdf
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  • 55
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    Benthic marine Amphipoda of southern California: families Aoridae, Photidae, Ischyroceridae, Corophiidae, Podoceridae (2021)
    In:  library@mlml.calstate.edu | http://aquaticcommons.org/id/eprint/11193 | 8 | 2013-06-06 23:58:52 | 11193 | Beaudette Foundation for Biological Research
    Details
    Publikationsdatum: 2021-06-29
    Schlagwort(e): Biology ; Ecology
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 3-72
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  • 56
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    The role of substrate, flow and larval supply to recruitment of the red abalone (Haliotis rufescens) (2021)
    University of California, Santa Barbara, Biology
    In:  jessie.altstatt@gmail.com | http://aquaticcommons.org/id/eprint/11330 | 29 | 2013-08-26 17:25:52 | 11330
    Details
    Publikationsdatum: 2021-07-01
    Beschreibung: Precipitous declines in wild populations of the red abalone Haliotis rufescens and the eventual closure of the commercial and southern recreational fishery have led to renewed interest in supplementing wild stocks with hatchery-raised individuals. Most work to date has focused on releasing small juveniles and has had limited success. Although much is known about larval settlement, juvenile survivorship and growth of abalone, there is scanty information on natural processes in the field. The failure of many regulated fisheries worldwide suggests that both the larval and juvenile stages may be important in determining the future population, and that early juvenile mortality is more important than previously believed. This paper presents a series of experiments designed to examine factors and mechanisms that could affect settlement, survivorship, and growth of larvae and early post-settlers in the field.Laboratory trials under different flow regimes showed that red abalone larvae settled preferentially on substrates encrusted with coralline algae, and that settlement was rapid when exposed to crusts compared to other surfaces. Urchin grazing of films appeared to facilitate abalone settlement but only when urchins were removed. Initial field experiments showed that released larvae settled on natural cobble rock, and that settlement was at least one order of magnitude greater when settlement habitats were tented. I then examined post-settlement survivorship at one and two days after settlement, and found that although there was a large amount of variation, on average 10% of released larvae were found as newly-settled recruits after 1 day. Survivorship and growth of recruits were followed over at least one month in both Spring and Fall. Abalone settled at higher densities, survived better and grew faster in the warmer Fall months than in the Spring. The density of month-old abalone recruits was correlated with density of naturally-occurring gastropods in the Spring, but not in the Fall. These results suggest that settlement and survivorship can be extremely variable across space and time, and that oceanographic and local biotic conditions play a role and should be considered when planning larval seeding.
    Beschreibung: Masters
    Beschreibung: Copyright permission signed by the author is on file with the IAMSLIC archive. PDF contains 116 pages (front matter + 109 pp.).
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 109
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  • 57
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    Estimating biomass of Macrocystis in the Hopkins Marine Life Refuge (edited by James M. Watanabe) (2021)
    Stanford University | Pacific Grove, CA
    In:  http://aquaticcommons.org/id/eprint/10920 | 29 | 2013-02-26 14:46:10 | 10920
    Details
    Publikationsdatum: 2021-07-02
    Beschreibung: Copyright permission signed by the author is on file with the IAMSLIC archive.
    Schlagwort(e): Biology ; Ecology
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 19
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  • 58
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    Report of the Workshop on Blue Crab Stock Dynamics in Chesapeake Bay, December 13-15, 1982, Chesapeake Biological Laboratory (2021)
    University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory | Solomons, MD
    In:  http://aquaticcommons.org/id/eprint/12395 | 130 | 2014-02-10 02:30:32 | 12395 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-06-30
    Beschreibung: This workshop was convened to begin building a foundation of understanding for developing and evaluating proposed measures for the rational management of the blue crab fishery in Chesapeake Bay. Our goal was to generate a summary of knowledge of blue crab stock dynamics. Specifically, we intended to address, and hoped to estimate, the basic parameters of an exploited stock - growth, mortality, natality, migration rates, sex ratios and abundance. In one sense these objectives were simply a means for organizing our discussions. A second objective was to compile at the workshop pertinent data held by the major research institutions on Chesapeake Bay so all participants could see the kinds and extent of existing data. As with many stock assessment problems, tailoring an estimating procedure around known existing data can be more productive than deciding on a procedure and then trying to find the required data in someone else's files.Authors of papers contributed to the report: B.S. Hester and P.R. Mundy (p. 50); Qisheng Tang (p. 86); L. Eugene Cronin (p. 111); J.R. McConaugha (p. 128); Cluney Stagg and Phil Jones (p. 153).
    Beschreibung: Chesapeake Bay Commission
    Beschreibung: University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Beschreibung: Editorial Series #ES-01-83, Center for Environmental and Estuarine Studies of the University of Maryland
    Schlagwort(e): Conservation ; Ecology ; Fisheries ; Management ; Planning ; Policies
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 168
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  • 59
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    Ecological factors related to the distribution of Bankia gouldi Bartsch in Chesapeake Bay (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12430 | 130 | 2014-02-08 03:56:16 | 12430 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-06-30
    Beschreibung: Organisms were collected on test panels, six inch lengths of dressed two by four inch pine, suspended in the water in a vertical position as described by Turner (1947). The panels were usually located at some convenient structure such as a dock-piling or sea-wall. Except where otherwise indicated by the data, the samples were collected from each station once a month between May 1950 and May 1953. During the three year period, seven hundred and nineteen panels were submerged in Chesapeake Bay. Approximately 14,000 organisms were encountered on these panels of which 20% or approximately 3,000 organisms could be identified from the dried pallets. Preliminary notes on the extent of fouling were made in the field after which the samples were removed to the laboratory for further study.
    Schlagwort(e): Biology ; Ecology ; Fisheries ; fouling
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 31
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  • 60
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    Preliminary Observations on spawning potential in the striped bass (Roccus saxatilis Walbaum) (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12426 | 130 | 2014-02-08 04:04:47 | 12426 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-06-30
    Beschreibung: This study was initiated during the summer of 1940 with the following objectives: (1) To determine at what age sexual maturity begins in striped bass of the Chesapeake Bay. (2) To determine whether the potential of reproduction declines with increasing age in Chesapeake Bay fish. (3) To determine whether striped bass in northern waters have a spawning cycle similar to that found in the Chesapeake Bay fish.
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 16
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  • 61
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    The life history of the silverside, Menidia menidia (Linnaeus) (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12580 | 130 | 2014-02-08 01:03:40 | 12580 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-03
    Beschreibung: This paper is based on an attempt to assemble the existing knowledge of the silverside, Menidia menidia, and to contribute to what is known about the life history of this species. A vast amount of work is needed on the ecological relationships between the food fish and the forage fish. One of the most important forage fishes on the Atlantic Coast is the silverside. To understand the inter-relationships between the food fish and the forage fish it is necessary first to understand the life histories of both. For this reason it is important that the life history of this species be studied.
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 30
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    An ecological study of seasonal distribution of Ostracoda, Solomons Island, Maryland, region (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12579 | 130 | 2014-02-10 02:22:35 | 12579 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-03
    Beschreibung: The determination of the distribution and seasonal fluctuations of ostracodes living in the littoral zone directly in front of the Chesapeake Biological Laboratory has been attempted in the present study. Samples taken in other parts of the Chesapeake Bay and around Solomons harbor, show that other species of ostracodes exist but these forms have not been considered in the two-year study here reported. The seasonal distribution of the species was compared with hydrographical records furnished for the same period by the Chesapeake Biological Laboratory in order to determine the correlation between ecological factors and seasonal fluctuations in numbers and species of Ostracoda.
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 61
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  • 63
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    Muskrats on tidal marshes of Dorchester County (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12581 | 130 | 2014-02-10 02:24:59 | 12581 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-03
    Beschreibung: This bulletin reports, in a non-technical manner, investigations on the Virginia muskrat, prevalent in Maryland, from July, 1949 to June, 1951.
    Beschreibung: International Health Division of the Rockefeller Foundation
    Beschreibung: Maryland Game and Inland Fish Commission
    Schlagwort(e): Biology ; Ecology
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 36
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  • 64
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    The Effects of coral bleaching in the northern Caribbean and western Atlantic (2021)
    Global Coral Reef Monitoring Network | Townsville, Australia
    In:  http://aquaticcommons.org/id/eprint/12585 | 9 | 2014-03-25 18:32:11 | 12585 | Central Caribbean Marine Institute
    Details
    Publikationsdatum: 2021-07-03
    Schlagwort(e): Conservation ; Ecology ; Environment
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 73-84
    Format: 152
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  • 65
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    Economic analysis of climate change adaptation strategies in selected coastal areas in Indonesia, Philippines and Vietnam (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12706 | 115 | 2013-12-03 13:14:38 | 12706 | WorldFish Center
    Details
    Publikationsdatum: 2021-07-04
    Beschreibung: Climate change with its attendant geophysical hazards is well studied. A great deal of attention has gone into analyzing climate change impacts as well as searching out possible mitigating adaptive strategies. These matters are very real concerns, especially for coastal communities. Such communities are often the most vulnerable to climate change, since their citizens frequently live in abject poverty and have limited capacity to adapt to geophysical hazards. Their situation is further complicated by the prospect of dealing with a confluence of hazards in comparison with those in other ecosystems. Against this backdrop Worldfish and the Economy and Environment Program for Southeast Asia (EEPSEA) collaborated to implement the cross-country study “Climate Change Impacts, Vulnerability Assessments, Economic and Policy Analysis of Adaptation Strategies in Selected Coastal Areas in Indonesia, Philippines, and Vietnam”. As its title suggests the study covered selected sites in Vietnam, Indonesia and the Philippines. Employing a gamut of interdisciplinary methodologies -- ranging from community-based approaches such as community hazard mapping and focus group discussions (FGDs) to regression techniques -- the study documented the impacts from three climate hazards affecting coastal communities. These were typhoon/flooding, coastal erosion, and saltwater intrusion. The team also analyzed planned adaptation options suited to implementation by communities and local governments, augmenting autonomous responses of households to protect and insure themselves from these hazards.
    Schlagwort(e): Ecology ; Environment ; Inland fisheries ; Climatic changes ; Ecosystems ; Asia ; Indonesia ; Philippines ; Vietnam
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 2
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  • 66
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    Community-based marine resource management in Solomon Islands: a facilitators guide (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12751 | 115 | 2013-12-03 13:58:51 | 12751 | WorldFish Center
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: This guide was developed to document the process and activities that WorldFish staff have used and adapted as facilitators working with communities interested in marine resource management in Solomon Islands. It draws on the experiences from work conducted with FSPI and MFMR through ACIAR funded projects, with communities that had a primary interest in the management of coral reef fisheries. Since 2011 the process has been trialed and adapted further with communities interested in mangrove ecosystem management (through the MESCAL project). This guide is based on lessons about the process of a community developing, writing and implementing a management plan. This guide does not cover lessons about the outcomes of that management.
    Beschreibung: CGIAR Research Program on Aquatic Agricultural Systems
    Beschreibung: Based on lessons from implementing CBRM with rural coastal communities in Solomon Islands (2005-2013)
    Schlagwort(e): Aquaculture ; Fisheries ; Ecology ; Marine resources ; Resource management ; Participatory approach ; Solomon Islands
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 50
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  • 67
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    Report of Chesapeake Biological Laboratory, 1937 (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12760 | 130 | 2014-02-08 01:04:22 | 12760 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: The Chesapeake Biological Laboratory is a research and study center founded to accelerate the acquisition of knowledge through the gathering and dissemination of facts to the end that there may be a fuller appreciation of nature.
    Schlagwort(e): Conservation ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 21
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  • 68
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    A governance analysis of the Barotse floodplain system, Zambia: identifying obstacles and opportunities (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12758 | 115 | 2013-12-04 08:33:21 | 12758 | WorldFish Center
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: The Barotse floodplain is an ecosystem characterized by a paradox of widespread poverty amidst high ecological and agricultural potential. The CGIAR Research Program on Aquatic Agricultural Systems (AAS) seeks to address this paradox on the assumption that the rural poor have the potential to transform their lives using the aquatic resources in their environment. Understanding the conditions for natural resources use and management is critical for a program that seeks to transform the livelihoods of households dependent on natural resources. The purpose of this report is to identify and analyze key governance variables influencing the livelihood outcomes of AAS program interventions in the Barotse floodplain system.
    Beschreibung: CGIAR Research Program on Aquatic Agricultural Systems
    Schlagwort(e): Fisheries ; Policies ; Ecology ; Flood plains ; Policy ; Governance ; Natural resources management ; Zambia
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 13
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  • 69
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    Crab mortality on Chesapeake Bay shedding floats (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12762 | 130 | 2014-02-08 01:07:54 | 12762 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: Reports of high mortality resulting from the impoundment of crabs (Callinectes sapidus) during the preshedding period, to produce soft crabs, have been current in Maryland and Virginia for many years. The death rate of crabs on floats has been estimated by certain of the operators to run as high as 86% at Cape Charles, and to figures nearly as high at Crisfield and elsewhere during one season of the year. A study of this mortality and the factors influencing it have been in progress at the Chesapeake Biological Laboratory for two seasons.
    Schlagwort(e): Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 14
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  • 70
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    On four species of Copepoda new to Chesapeake Bay, with a description of a new variety of Paracalanus crassirostris Dahl (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12763 | 130 | 2014-02-08 03:54:32 | 12763 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: At this time, four additional species, unreported by Wilson [1932], can be added to the list of those species to be found within the limits of the bay. These are Acartia tonsa Dana, Cyclops vernalis Fischer, Diaptomus spatulocrenatus Pearse, and Paracalanus crassirostris Dahl var. nudus nov. The specimens from which identifications were made were collected by means of Clarke-Bumpus nets, in use on the motor ship "Mahatru."
    Schlagwort(e): Ecology
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 11
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  • 71
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    Report of Chesapeake Biological Laboratory, 1938 (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12761 | 130 | 2014-02-08 03:53:19 | 12761 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-05
    Beschreibung: Substantial progress was made in 1938 both in respect to additions made in the physical plant and to the problems effectively pursued by an energetic staff.
    Schlagwort(e): Conservation ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 19
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  • 72
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    A survey of the marine nematodes of Chesapeake Bay, Maryland (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12825 | 130 | 2014-02-08 01:01:26 | 12825 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-06
    Beschreibung: The study here reported is a survey of the most common non-parasitic nematode families of Chesapeake Bay, Maryland, with descriptions and figures, so that ecological workers and students of invertebrate zoology may be encouraged not to pass over this highly interesting and abundant invertebrate phylum. This survey is not a complete account of the free-living nematode population of the Bay, however, since only the middle section of the Bay was sampled and since the collections were not made systematically throughout the year. The physical and chemical factors of Chesapeake Bay may be found in several publications of the Chesapeake Biological Laboratory, Solomons Island, Maryland, and in the records of the Chesapeake Bay Institute, Annapolis, Maryland.
    Schlagwort(e): Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 70
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  • 73
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    A study of water quality in Baltimore Harbor (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12824 | 130 | 2014-02-08 04:02:55 | 12824 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-06
    Beschreibung: Baltimore Harbor is polluted by discharge of sewage and industrial wastes into tributary streams and peripheral waters. The Harbor is used extensively for navigation, industrial water supply, and recreation as well as for waste disposal. The degree of pollution varies from negligible in the principal fairway to severe in the innermost sections. Private industry discharges several hundred tons of acid materials daily and is also the principal source of organic pollution.
    Beschreibung: PDF includes 141 pp. (front matter + 132 pp.).
    Schlagwort(e): Conservation ; Ecology ; Environment ; Pollution
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 132
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  • 74
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    Effect of Susquehanna River stream flow on Chesapeake Bay salinities and history of past oyster mortalities on upper Bay bars (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12826 | 130 | 2014-02-08 03:57:09 | 12826 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-06
    Beschreibung: A study of possible causes for extensive mortality of oysters in the Upper Chesapeake Bay was taken on by year-round monitoring of conditions during a two-year period.
    Beschreibung: Reprinted from 1946 annual report, Maryland Board of Natural Resources.
    Schlagwort(e): Ecology ; Environment ; Fisheries
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 11
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  • 75
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    Introduction to fish species diversity: Sunamganj haor region within CBRMP's working area (2021)
    Community Based Resource Management Project-LGED | Dhaka, Bangladesh
    In:  http://aquaticcommons.org/id/eprint/12822 | 115 | 2013-12-04 11:23:18 | 12822 | WorldFish Center
    Details
    Publikationsdatum: 2021-07-06
    Beschreibung: This book is a modest attempt at identifying Sunamganj haor fish species, especially in areas falling under the Sunamganj Community Based Resource Management Project (CBRMP). It contains a total of 126 fish species from 39 families found in the Sunamganj haor area. CBRMP has promoted community based fisheries management approaches that, along with their livelihoods focus, are helping to preserve and enhance natural fish stocks in the hoar basin. WorldFish support to LGED involves a number of areas including monitoring the impacts of CBRMP on fish catch, bio-diversity and livelihoods.
    Beschreibung: Community Based Resource Management Project
    Beschreibung: Research Team: Balaram Mahalder, M. G. Mustafa Editing: Dr. M. Niamul Naser, A.K.M. Firoz Khan
    Schlagwort(e): Ecology ; Fisheries ; Freshwater fish ; Species diversity ; Research ; Bangladesh
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 75
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  • 76
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    Fresh-water dinoflagellates of Maryland (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12827 | 130 | 2014-02-10 02:21:33 | 12827 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publikationsdatum: 2021-07-06
    Beschreibung: Collections were made in the summer of 1942 and again at different times in 1946 and 1947. Some collections were not sufficient in numbers to allow for proper identification, so the present paper does not give a complete list. Of the 20 identified species reported on in the paper, two are new to science and ten have not been reported previously for the United States.
    Schlagwort(e): Ecology ; Environment
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 28
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  • 77
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    Observations of the Effects of Oil Field Structures on their biotic Environment: Platform Fouling Community (2021)
    Dames & Moore | Houston, TX
    In:  http://aquaticcommons.org/id/eprint/14137 | 9596 | 2020-08-31 18:05:50 | 14137 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: The fouling community, its planktonic larvae and its predators were studied at Buccanneer Field, Texas from May, 1976 to April, 1977. Sixteen algae and 101 invertebrate species were identified from the structures. The existing fouling community was dominated by the large barnacle Balanus tintinnabulum, which provided a matrix of crevices in which other invertebrates were found. Unoccupied space was rare in the natural community but persisted for several months in disturbed quadrats, especially in winter. The erect bryozoan Savignyella lafonti and the urchin Arbacia punctulata were seasonally common on the well jacket but absent or rare on the production platform. On the other hand, the erect bryozoans Bugula neritina and Bugula rylandi and the hydroid Tubularia crocea were seasonally common on the platform but rate on the well jacket. Predator exclusion cages on experimental quadrats seemed to encourage the development of Savignyella lafonti and tubes of the corophiid amphipod Erichthonius brasiliensis. Scraped quadrats were recolonized primarily by hydroids, green algae and sponges. Several fouling species were found on shells on the bottom directly beneath the structures which did not occur on the structures themselves. Growth rates of several mollusks (Pteria colymbus, Musculus lateralis, Anadara transversa, Aequipecten gibbus, and Ostrea equestris) were sufficiently rapid to permit adult size to be attained in less than one year.
    Schlagwort(e): Ecology ; biotic environment ; fouling ; oil field structures ; planktonic species
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 37
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  • 78
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    Nereis (Neanthes) micromma n.sp. (Polychaeta: Nereididae) from the northern Gulf of Mexico with a note of the structure of neriedid palps. (2021)
    In:  http://aquaticcommons.org/id/eprint/14176 | 9596 | 2020-08-31 20:27:04 | 14176 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: A new species of polychaete annelid, Nereis (Neanthes) micromma, is described and illustrated. The species, which is most abundant on muddy sand bottoms, has been collected offshore from the Texas coast. The inappropriateness of biarticulate in describing the palps of some nereidids is discussed.
    Schlagwort(e): Ecology ; marine invertebrates ; polychaetes ; marine annelids ; new species ; Nereis (Neanthes) micromma ; reproduction ; seasonal distribution
    Repository-Name: AquaDocs
    Materialart: article
    Format: application/pdf
    Format: application/pdf
    Format: 91-103
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  • 79
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    Oyster Studies Along the Texas Coast, 1968 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14240 | 9596 | 2020-08-31 20:19:08 | 14240 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Oyster (Crassostrea virginica) studies showed death rates to be low in Aransas and Galveston Bays but relatively high in Matagorda Bay. Initial mortality in Matagorda Bay was associated with freshwater and siltation but subsequent summer deaths were associated with Labyrinthomyxa infection.
    Schlagwort(e): Ecology ; oysters ; Crassostrea virginica ; mortality ; oyster fisheries ; Labyrinthomyxa sp. ; fungal diseases ; stock assessment ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 80
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    Levels of Concentration and Incidence of Various Pesticide Toxicants in Some Species from Selected Bay Areas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14239 | 9596 | 2020-08-23 21:29:40 | 14239 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Tissue samples analyzed indicate that residues of some pesticides are present in all Texas bay areas sampled, including Galveston Bay. The residues detected are DDT, Dieldrin and Endrin. The incident of DDT residues decreased slightly in both oyster, Crassostrea virginica, and fish samples during the study period. The incidence of Dieldrin increased dramatically in oyster samples while decreasing in fish samples. The incidence of Endrin remained essentially unchanged. Ovaries of speckled trout, Cynoscion nebulosus, contained enough DDT residue to cause concern over the possible impairment of reproductive ability.
    Schlagwort(e): Ecology ; pesticides ; dichlorodiphenyltrichloroethane (DDT) ; dieldrin ; endrin ; oysters ; Crassostrea virginica ; speckled trout ; Cynoscion nebulosus ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 81
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    Population Studies of the Sports and Commercial Fin-fish and Forage Species of the Galveston Bay system (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14199 | 9596 | 2020-08-31 20:31:42 | 14199 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Collections were made at fixed stations with various types of gear to obtain samples of adult game fish, juvenile game fish, and forage species. The stations in West Bay generally produced larger catches of juvenile and adult game fish than did the stations in other bays. The reverse was true of forage collections. Those forage stations in the less saline areas of the bay, for example, the Clear Lake Station, produced larger catches than the lower bay stations. Fish tags, returned during the study, indicated little movement of those fish recaptured. Redfish tag returns were much higher than those from other species.
    Schlagwort(e): Ecology ; Fisheries ; marine fish ; population dynamics ; ecological distribution ; tagging
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 16
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  • 82
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    Ecological Attribute Alteration: Measurement and Evaluation: Activity Assessment Routine: Ecological Systems Component (2021)
    RPC, Inc. | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14166 | 9596 | 2020-08-31 20:24:34 | 14166 | Galveston Bay Information Collection
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    Publikationsdatum: 2021-06-24
    Beschreibung: This technical paper is intended to provide a more complete treatment of implicit principles and assumptions contained in the user's manual for the ecological systems component of the activity assessment routine. The ecological systems component (ESC) defines a method for evaluating changes in an ecosystem which may result from resource use and consumption. This paper begins by characterizing an ecosystem as an organized collection of attributes mutually dependent on energy exchange. The magnitude matrix with which altered energy flows are scaled is described in Chapter 4. The magnitude of an alteration is assessed somewhat differently for the two categories of attributes: discussion of conventions relevant to this distinction is provided in Chapter 5. However, effects on attributes are variable through time, and additional remarks concerning duration are included in Chapter 6. Finally, possible exceptions to the general guidelines for designating the direction of an effect are introduced in Chapter 7.
    Schlagwort(e): Ecology ; Management ; coastal zone management ; ecological assessment ; evaluation
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 60
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  • 83
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    Field Guide to the Flatfishes of the Family Bothidae in the Western North Atlantic (2021)
    In:  http://aquaticcommons.org/id/eprint/14184 | 9596 | 2020-08-31 20:27:57 | 14184 | Galveston Bay Information Collection
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    Publikationsdatum: 2021-06-24
    Beschreibung: Keys are presented to facilitate both field and laboratory identification of the 14 genera and 47 species of flatfishes in the western North Atlantic. Illustrations for 46 species, the salient familial and subfamily characteristics, and short descriptions with geographic and bathymetric distributions are given.
    Schlagwort(e): Ecology ; Fisheries ; marine fish ; flatfishes ; Bothidae ; identification keys ; ecological distribution
    Repository-Name: AquaDocs
    Materialart: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 47
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  • 84
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    Study of the Texas Bay Populations of Juvenile Shrimp, Penaeus aztecus, Penaeus setiferus, and Penaeus duorarum (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14185 | 9596 | 2020-08-31 20:28:08 | 14185 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Postlarvae were found entering Aransas Bay in appreciable numbers in the spring of 1963. Late post-larval and early juvenile stages of brown shrimp, Penaeus aztecus, were found in tertiary bays in April. White shrimp, P. setiferus were found in May and June. Brown shrimp grew about 0.8 mm per day, while white shrimp grew about 1.1 mm per day. The first wave appeared to be smaller than latter waves. Small brown shrimp were found moving through the inshore Gulf in large numbers in June and July. White shrimp reached a larger size in the bays in June and July. White shrimp reached a larger size in the bays and supported a large commercial bay fishery. Late fall waves of white shrimp left the bays at a smaller size (probably to escape low water temperatures). Preliminary data indicate the 1963 shrimp landings increased 25% over 1962 landings.
    Schlagwort(e): Ecology ; penaeid shrimp ; juveniles ; landing statistics ; white shrimp ; Penaeus setiferus ; brown shrimp ; Penaeus aztecus ; Penaeus duorarum ; growth
    Repository-Name: AquaDocs
    Materialart: book_section
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    Format: application/pdf
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  • 85
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    Report on Studies of Oyster Parasites in the Aransas Bay and Galveston Bay areas of Texas (2021)
    Texas Game and Fish Commission | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14238 | 9596 | 2020-08-28 14:53:38 | 14238 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: The first collection of oyster for this study was taken off Fulton Beach, Aransas Bay on January 1, 1962. Subsequently, 34 collections were made, most of them in Aransas Bay, but several collections were made in Mesquite, Tres Palacios, Corpus Christi, and Galveston Bays. These oysters were sectioned and slides made, a total of more than 1300. All collections were of live oysters, and the reading of the slides was a slow process. Live oysters were used because the platforms which were to hold trays of oysters were delayed in construction. Hence, no data on mortality are available. The period from January 1, 1962, to June 26, 1962, was used to determine roughly from the slides what parasites and diseases were present and where they were located. The data on collections are listed in Table 1.
    Schlagwort(e): Ecology ; oysters ; parasites ; parasitism ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 11
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  • 86
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    A study of commercial shrimp populations in coastal bays of Texas,1968 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14243 | 9596 | 2020-08-23 21:20:15 | 14243 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: In spring, the growth of brown shrimp, Penaeus aztecus, in Texas bays, including Galveston Bay, was delayed by cold water. Low salinity patterns of upper coastal bays confined the young to more saline lower regions of estuaries. The gulfward migration began in late May. By July most had left the bays. Heavy rainfall and runoff may have been beneficial to white shrimp, Penaeus setiferus. They were abundant in samples and over 12 million pounds were landed commercially.
    Schlagwort(e): Ecology ; penaeid shrimp ; temperature effects ; Penaeus aztecus ; salinity effects ; Penaeus setiferus ; growth ; estuaries ; population dynamics ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 87
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    Check list of the fishes and commercial shrimp of Area M-2 (2021)
    Texas Game and Fish Commission | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14210 | 9596 | 2020-08-31 20:16:44 | 14210 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Stations were established throughout the area in order to obtain a full and representative sampling of the fishes present. Of the 78 species of fish included in this checklist some 48 might be considered to be endemic, living significant portions of their lives in the area. Twenty-two appear to be occasional visitors, and eight are juvenile stragglers into the area. Data concerning the commercial shrimp are presented last.
    Schlagwort(e): Ecology ; Fisheries ; marine fisheries ; marine fish ; shrimp fisheries ; check lists ; distribution ; penaeid shrimp ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 32
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  • 88
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    Chemical and physical analysis of the water of Area M-2 (2021)
    Texas Game and Fish Commission | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14213 | 9596 | 2020-08-23 22:33:19 | 14213 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Observations and analysis of the various features of the water of upper Galveston and Trinity Bays (Area M-2) were made using dye, thermometers, chemical tests, and other appropriate methods. Information and data were also collected from numerous publications and other sources. The distribution of marine organisms relative to pollution in the Houston Ship Channel was investigated.
    Schlagwort(e): Chemistry ; Ecology ; Pollution ; chemical analysis ; physical properties ; water analysis ; pollution ; marine organisms ; ecological distribution ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 19
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  • 89
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    Effects of Engineering Projects on the Ecology of Jones Bay - Effects of Engineering Projects on Galveston Bay Estuaries - Evaluation of the Effects of Estuarine Engineering Projects (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14262 | 9596 | 2020-08-23 20:01:31 | 14262 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: In 1962 construction was begun on the Texas City and Vicinity Hurricane- Flood Protection Project, a program of the U.S. Corps of Engineers, which provided for a 16.2 mile long earthen seawall along the western shoreline of Galveston Bay. This levee, with a maximum height of 23 feet above sea level, was designed to protect low areas from tidal flooding during storms. In 1964, the Hitchcock Extension of the Hurricane-Flood Protection was proposed, a plan consisting of an 11.4 mile levee to protect the city of Hitchcock and vicinity. A portion of this levee crosses Jones Bay. Circulation in the bay would be provided by a closable tidal structure and culvert openings.
    Schlagwort(e): Ecology ; Engineering ; Environment ; flood control ; sea walls ; levees ; environmental effects ; ecology ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 90
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    Study of Sand Seatrout of the Galveston Bay Area (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14274 | 9596 | 2020-10-17 16:17:25 | 14274 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Sand seatrout (Cynoscion arenarius Ginsberg) were studied in the Galveston Bay area to provide information on seasonality, population composition, food items, growth, and spawning. Tagging efforts resulted in 518 tagged fish and a return of 16 tags during the 1968-70 period. Tag recovery data suggest a migration from the upper bay to the lower bay and Gulf waters in December and return in March. Electrophoretic analysis of multiple hemoglobin protein types were studied from 96 sand seatrout blood samples. Five protein types were observed without discernible differences that could be attributed to population heterogeneity. Analysis of stomach content revealed crustacea and fish as primary food items. Gonad development stages indicate a spawning period from March through August.
    Schlagwort(e): Ecology ; marine fish ; sand seatrout ; Cynoscion arenarius ; growth ; seasonality ; community composition ; food preferences ; spawning ; tagging ; stomach content ; migrations ; electrophoresis ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 91
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    Galveston Bay Oyster Studies, 1971 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14264 | 9596 | 2020-08-23 20:48:55 | 14264 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Galveston Bay oyster stocks were studied to detect changes which might affect the public reef oyster harvest. A mild winter and above normal salinity values favored increased disease (Labyrinthomyxa) incidence as well as increased predation from oyster drills (Thais) and stone crabs (Menippe). These factors resulted in annual death rates of 52% to 55% among older oysters groups. Oyster spat in an epidemic area were Labyrinthomyxa-infected by fall and suffered above normal mortality.
    Schlagwort(e): Ecology ; Fisheries ; oysters ; stock assessment ; oyster reefs ; oyster fisheries ; predation ; fungal diseases ; oyster drills ; stone crab ; seed ; spat ; larval settlement ; mortality ; survival ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 92
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    Analysis of Populations of Sports and Commercial Fin-fish in the Coastal Bays of Texas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14242 | 9596 | 2020-08-31 20:19:45 | 14242 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Juvenile game fish were sampled in 1968 in all Texas bay areas with 60 ft. bag seines; adult fish were sampled in Galveston Bay by drag seine and in Aransas Bay and the Upper and Lower Laguna Madre with trammel nets. A general and significant increase in the relative abundance of juvenile redfish, Sciaenops ocellata, was noted. In the case of trout, Cynoscion nebulosus, flounder, Paralichthys lethostigma, black drum, Pogonias cromis, and sheepshead, Archosargus probatocephalus, there was either a decline in general abundance or no significant change from the previous year. While variations in abundance of adult fish occurred within bays, no coastwide patterns could be discerned. These samples were obtained in order to determine relative abundance, seasonal fluctuations in abundance and success of spawning. Captured fish of sufficient size and in good condition were tagged and released to study movements, migrations and rate of fishing harvest.
    Schlagwort(e): Ecology ; Fisheries ; marine fish ; game fish ; finfish fisheries ; juveniles ; commercial species ; population dynamics ; seine nets ; entangling nets ; abundance ; seasonal variations ; spawning ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 93
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    Survey of Fish Populations in the Inshore Gulf of Mexico off Texas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14247 | 9596 | 2020-08-28 15:46:37 | 14247 | Galveston Bay Information Collection
    Details
    Publikationsdatum: 2021-06-24
    Beschreibung: Fish populations in the inshore Gulf of Mexico off Port Aransas, Texas, Port Mansfield and Port Isabel, Texas and briefly off Galveston, Texas, were surveyed for type, abundance and size with a flat otter trawl. In regular weekly samples, 25,044 fish of 89 species were caught in 100 otter trawl samples. Atlantic croaker, Micropogon undulatus; sand trout, Cynoscion nothus; moonfish, Vomer setapinnis; bumper, Chloroscombrus chrysurus; and shoal flounder Syacium gunteri, were the five most abundant species taken in depths ranging from 3 to 16 fathoms. These results indicate that enough trash fish may be caught during routine shrimp trawling to sustain a profitable fishery if a market develops. No attempt was made to evaluate the abundance of larger food or game fishes.
    Schlagwort(e): Ecology ; Fisheries ; marine fish ; trawl nets ; population dynamics ; GBIC
    Repository-Name: AquaDocs
    Materialart: book_section
    Format: application/pdf
    Format: application/pdf
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  • 94
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    Sea surface temperature and the subsequent freshwater survival rate of some salmon stocks: a surprising link between the climate of land and sea (2021)
    In:  http://aquaticcommons.org/id/eprint/14469 | 8 | 2014-02-14 00:44:32 | 14469
    Details
    Publikationsdatum: 2021-06-25
    Beschreibung: Previous consideration of the relationship between climate and the survival rate of Pacific salmon eggs and fry has been confined to effects of large variation in the ambient freshwater environment; e.g., stream discharge, temperature, turbidity. This analysis shows sea surface temperatures during the last year of life of maturing adult salmon are also strongly associated with the subsequent survival rate of salmon eggs and fry is fresh water, presumably through development of the future eggs or sperm. In several stocks of three species of North American salmon, the association between the "marine" climate and egg survival is stronger than, or additive to, any estimated climatic association in fresh water. This apparent and surprising link between fresh water and the distant ocean has some interesting and complex implications for management of future salmon production.
    Schlagwort(e): Ecology ; Oceanography ; PACLIM
    Repository-Name: AquaDocs
    Materialart: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 23-32
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  • 95
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    Application of an acoustic–trawl survey design to improve estimates of rockfish biomass (2021)
    In:  dana.hanselman@noaa.gov | http://aquaticcommons.org/id/eprint/14482 | 403 | 2014-02-27 17:12:09 | 14482 | United States National Marine Fisheries Service
    Details
    Publikationsdatum: 2021-06-25
    Beschreibung: Biomass estimates of several species of Alaskan rockfishesexhibit large interannual variations. Because rockfishes are long lived and relatively slow growing, large, short-term shifts in population abundance are not likely. We attribute the variations in biomass estimates to the high variability in the spatial distribution of rockfishes that is not well accounted for by the survey design currently used. We evaluated the performance of an experimental survey design, the Trawl and Acoustic Presence/Absence Survey (TAPAS), to reduce the variability in estimated biomass for Pacific ocean perch (Sebastes alutus). Analysis of archived acoustic backscatter data produced an acoustic threshold for delineating potential areas of high (“patch”) and low (“background”) catch per unit of effort (CPUE) in real time. In 2009, we conducted a 12-day TAPAS near Yakutat, Alaska. We completed 59 trawls at 19 patch stations and 40 background stations. The design performed well logistically, and Pacific ocean perch (POP) accounted for 55% of the 31 metric tons (t) of the catch from this survey. The resulting estimates of rockfish biomass were slightly less precise than estimates from simple random sampling. This difference in precision was due to the weak relationship of CPUE to mean volume backscattering and the relatively low variability of POP CPUE encountered. When the data were re-analyzed with a higher acoustic threshold than the one used in the field study, performance was slightly better with this revised design than with the original field design. The TAPAS design could be made more effective by establishing a stronger link between acoustic backscatter and CPUE and by deriving an acoustic threshold that allows better identification of backscatter as that from the target species.
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 379-396
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  • 96
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    Temporal trends (2000–2011) and influences on fishery-independent catch rates for loggerhead sea turtles (Caretta caretta) at an important coastal foraging region in the southeastern United States (2021)
    In:  arendtm@dnr.sc.gov | http://aquaticcommons.org/id/eprint/14489 | 403 | 2014-02-13 04:28:13 | 14489 | United States National Marine Fisheries Service
    Details
    Publikationsdatum: 2021-06-26
    Beschreibung: Seasonal trawling was conducted randomly in coastal (depths of 4.6–17 m) waters from St. Augustine, Florida, (29.9°N) to Winyah Bay, South Carolina (33.1°N), during 2000–03, 2008–09, and 2011 to assess annual trends in the relative abundance of sea turtles. A total of 1262 loggerhead sea turtles (Caretta caretta) were captured in 23% (951) of 4207 sampling events. Capture rates (overall and among prevalent 5-cm size classes) were analyzed through the use of a generalized linear model with log link function for the 4097 events that had complete observations for all 25 model parameters. Final models explained 6.6% (70.1–75.0 cm minimum straight-line carapace length [SCLmin]) to 14.9% (75.1–80.0 cm SCLmin) of deviance in the data set. Sampling year, geographic subregion, and distance from shore were retained as significant terms in all final models, and these terms collectively accounted for 6.2% of overallmodel deviance (range: 4.5–11.7% of variance among 5-cm size classes). We retained 18 parameters only in a subset of final models: 4 as exclusively significant terms, 5 as a mixture of significant or nonsignificant terms, and 9 as exclusively nonsignificant terms. Four parameters also were dropped completely from all final models. The generalized linear model proved appropriate for monitoring trends for this data set that was laden with zero values for catches and was compiled for a globally protected species. Because we could not account for much model deviance, metrics other than those examined in our study may better explain catch variability and, once elucidated, their inclusion in the generalized linear model should improve model fits.
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 470-483
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  • 97
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    Reactions of fishes to two underwater survey tools, a manned submersible and a remotely operated vehicle (2021)
    In:  tom.laidig@noaa.gov | http://aquaticcommons.org/id/eprint/14494 | 403 | 2014-02-13 04:22:14 | 14494 | United States National Marine Fisheries Service
    Details
    Publikationsdatum: 2021-06-26
    Beschreibung: We examined the reactions of fishes to a manned submersible and a remotely operated vehicle (ROV) during surveys conducted in habitats of rock and mud at depths of 30–408 m off central California in 2007. We observed 26 taxa for 10,550 fishes observed from the submersible and for 16,158 fishes observed from the ROV. A reaction was defined as a distinct movement of a fish that, for a benthic or hovering individual, was greater than one body length away from its initial position or, for a swimming individual, was a change of course or speed. Of the observed fishes, 57% reacted to the ROV and 11% reacted to the submersible. Aggregating species and those species initially observed off the seafloor reacted most often to both vehicles. Fishes reacted more often to each vehicle when they were 〉1 m above the seafloor (22% of all fishes 〉1 m above the seafloor reacted to the submersible and 73% to the ROV) than when they were in contact with the seafloor (2% of all reactions to the submersible and 18% to the ROV). Fishes reacted by swimming away from both vehicles rather than toward them. Consideration of these reactions can inform survey designs and selection of survey tools and can, thereby, increase the reliability of fish assemblage metrics (e.g., abundance, density, and biomass) and assessments of fish and habitat associations.
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 54-67
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  • 98
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    A new species of western Atlantic lizardfish (Teleostei: Synodontidae: Synodus) and resurrection of Synodus bondi Fowler, 1939, as a valid species from the Caribbean with redescriptions of S. bondi, S. foetens (Linnaeus, 1766), and S. intermedius (Agassiz, 1829) (2021)
    In:  frableb@si.edu | http://aquaticcommons.org/id/eprint/14499 | 403 | 2014-02-13 04:18:37 | 14499 | United States National Marine Fisheries Service
    Details
    Publikationsdatum: 2021-06-26
    Beschreibung: Western Atlantic synodontid species were studied as part of an ongoing effort to reanalyze Caribbean shorefish diversity. A neighbor-joining tree constructed from cytochrome c oxidase I (COI) data revealed 2 highly divergent genetic lineages within both Synodus intermedius (Agassiz, 1829) (Sand Diver) and S. foetens (Linnaeus, 1766) (Inshore Lizardfish). A new species, Synodus macrostigmus, is described for one of the S. intermedius lineages. Synodus macrostigmus and S. intermedius differ in number of lateral-line scales, caudal pigmentation, size of the scapular blotch, and shape of the anterior-nostril flap. Synodus macrostigmus and S. intermedius have overlapping geographic and depth distributions, but S. macrostigmus generally inhabits deeper water (〉28 m) than does S. intermedius and is known only from coastal waters of the southeastern United States and the Gulf of Mexico, in contrast to those areas and the Caribbean for S. intermedius. Synodus bondi Fowler, 1939, is resurrected from the synonymy of S. foetens for one of the S. foetens genetic lineages. The 2 species differ in length and shape of the snout, number of anal-fin rays, and shape of theanterior-nostril flap. Synodus bondi and S. foetens co-occur in the central Caribbean, but S. bondi otherwise has a more southerly distribution than does S. foetens. Redescriptions are provided for S. intermedius, S. foetens, and S. bondi. Neotypes are designated for S. intermedius and S. foetens. A revised key to Synodus species in the western Atlantic is presented.
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 122-146
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  • 99
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    Quantifying intrapopulation variability in stable isotope data for Spotted Seatrout (Cynoscion nebulosus) (2021)
    In:  fulford.richard@epa.gov | http://aquaticcommons.org/id/eprint/14498 | 403 | 2014-02-13 04:19:23 | 14498 | United States National Marine Fisheries Service
    Details
    Publikationsdatum: 2021-06-26
    Beschreibung: Stable isotope (SI) values of carbon (δ13C) and nitrogen (δ15N) are useful for determining the trophic connectivity between species within an ecosystem, but interpretation of these data involves important assumptions about sources of intrapopulation variability. We compared intrapopulation variability in δ13C and δ15N for an estuarine omnivore, Spotted Seatrout (Cynoscion nebulosus), to test assumptions and assess the utility of SI analysis for delineation of the connectivity of this species with other species in estuarine food webs. Both δ13C and δ15N values showed patterns of enrichment in fish caught from coastal to offshore sites and as a function of fish size. Results for δ13C were consistent in liver and muscle tissue, but liverδ15N showed a negative bias when compared with muscle that increased with absolute δ15N value. Natural variability in both isotopes was 5–10 times higher than that observed in laboratory populations, indicating that environmentally driven intrapopulation variability is detectable particularly after individual bias is removed through sample pooling. These results corroborate the utility of SI analysis for examination of the position of Spotted Seatrout in an estuarine food web. On the basis of these results, we conclude that interpretation of SI data in fishes should account for measurable and ecologically relevant intrapopulation variability for each species and system on a case by case basis.
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 111-121
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  • 100
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    Shifts in the estuarine demersal fish community after a fishery closure in Puget Sound, Washington (2021)
    In:  essing@uw.edu | http://aquaticcommons.org/id/eprint/14504 | 403 | 2014-02-13 18:26:57 | 14504 | United States National Marine Fisheries Service
    Details
    Publikationsdatum: 2021-06-26
    Beschreibung: Puget Sound is one of the largest and most ecologically significant estuaries in the United States, but the status and trends of many of its biological components are not well known. We analyzed a 21-year time series of data from standardized bottom trawl sampling at a single study area to provide the first assessment of population trends of Puget Sound groundfishes after the closure of bottom trawl fisheries. The expected increase in abundance was observed for only 3 of 14 species after this closure, and catch rates of most (10) of the abundant species declined through time. Many of these changes were stepwise (abrupt) rather than gradual, and many stocks exhibited changes in catch rate during the 3-year period from 1997 through 2000. Nodetectable change was recorded for either temperature or surface salinity over the entire sampling period. The abrupt density reductions that were observed likely do not reflect changes in demographic rates but may instead represent distributional shifts within Puget Sound.
    Schlagwort(e): Biology ; Ecology ; Fisheries
    Repository-Name: AquaDocs
    Materialart: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 205-217
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