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  • Articles  (4,468)
  • Elsevier  (2,526)
  • Springer  (1,942)
  • American Meteorological Society
  • 1995-1999  (1,703)
  • 1990-1994  (1,492)
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  • 1950-1954  (269)
  • 1995  (1,703)
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  • 1969  (1,004)
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  • 1950  (156)
  • Architecture, Civil Engineering, Surveying  (4,468)
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  • Articles  (4,468)
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  • 1995-1999  (1,703)
  • 1990-1994  (1,492)
  • 1965-1969  (1,004)
  • 1955-1959
  • 1950-1954  (269)
Year
Journal
  • 1
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    GPS solutions 1 (1995), S. 3-4 
    ISSN: 1521-1886
    Source: Springer Online Journal Archives 1860-2000
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  • 2
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    GPS solutions 1 (1995), S. 1-2 
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  • 3
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    GPS solutions 1 (1995), S. 11-12 
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  • 4
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    GPS solutions 1 (1995), S. 7-8 
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  • 5
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    GPS solutions 1 (1995), S. 5-6 
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  • 6
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    GPS solutions 1 (1995), S. 9-10 
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  • 7
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    GPS solutions 1 (1995), S. 81-81 
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  • 8
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    GPS solutions 1 (1995), S. 86-87 
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  • 9
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    GPS solutions 1 (1995), S. 90-90 
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  • 10
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    GPS solutions 1 (1995), S. 91-93 
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  • 11
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    GPS solutions 1 (1995), S. 94-95 
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  • 12
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    GPS solutions 1 (1995), S. 88-89 
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  • 13
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    GPS solutions 1 (1995), S. 108-112 
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  • 14
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    GPS solutions 1 (1995), S. 99-107 
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  • 15
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    GPS solutions 1 (1995), S. 96-98 
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  • 16
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    GPS solutions 1 (1995), S. 129-138 
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  • 17
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    GPS solutions 1 (1995), S. 121-128 
    ISSN: 1521-1886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: In the previous article we covered what asset location systems (ALS) are and the features and benefits they offer. In this article we explore the various features to be considered when acquiring an ALS and steps to be taken. We discuss what users are saying they want in an ALS, including the results of a survey of vehicle tracking system users and providers.
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  • 18
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    GPS solutions 1 (1995), S. 139-142 
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  • 19
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    GPS solutions 1 (1995), S. 113-120 
    ISSN: 1521-1886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Abstract The vertical component obtained from the Global Positioning System (GPS) observations is from the ellipsoid (a mathematical surface), and therefore needs to be converted to the orthometric height, which is from the geoid (represented by the mean sea level). The common practice is to use existing bench marks (around the four corners of a project area and interpolate for the rest of the area), but in many areas bench marks may not be available, in which case an existing geoid undulation is used. Present available global geoid undulation values are not generally as detailed as needed, and in many areas they are not known better than ±1 to ±5 m, because of many limitations. This article explains the difficulties encountered in obtaining precise geoid undulation with some example computations, and proposes a technique of applying corrections to the best available global geoid undulations using detailed free-air gravity anomalies (within a 2° × 2° area) to get relative centimeter accuracy. Several test computations have been performed to decide the optimal block sizes and the effective spherical distances to compute the regional and the local effects of gravity anomalies on geoid undulations by using the Stokes integral. In one test computation a 2° × 2° area was subdivided into smaller surface elements. A difference of 37.34 ± 1.6 cm in geoid undulation was obtained over the same 2° × 2° area when 1° × 1° block sizes were replaced by a combination of 5' × 5' and 1' × 1' subdivision integration elements (block sizes).
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  • 20
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    GPS solutions 1 (1995), S. 143-144 
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  • 21
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    GPS solutions 1 (1995), S. 145-146 
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  • 22
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    GPS solutions 1 (1995), S. 148-149 
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  • 23
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    GPS solutions 1 (1995), S. 146-146 
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  • 24
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    GPS solutions 1 (1995), S. 23-27 
    ISSN: 1521-1886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: This is the first in a series of three articles authored by John Beukers. In this series, John will lead us through some of today's relevant radionavigation history putting turbulent times into perspective. Picking out what he considers significant in the current debate, he projects the future for satellite and terrestrial radionavigation systems well into the 21st century.
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  • 25
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    GPS solutions 1 (1995), S. 48-53 
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  • 26
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    GPS solutions 1 (1995), S. 38-47 
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  • 27
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    GPS solutions 1 (1995), S. 54-58 
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  • 28
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    GPS solutions 1 (1995), S. 59-64 
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  • 29
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    GPS solutions 1 (1995), S. 13-22 
    ISSN: 1521-1886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Asset location systems, including vehicle and property tracking systems, are in the verge of exploding onto the scene for widespread business and personal use. This is due in part to decreased costs of GPS equipment, and greater availability of wireless communication systems, but also largely due to public awareness of their capabilities and benefits. Companies, organizations, and individual consumers that earlier could not justify the costs of tracking systems are now seriously considering their implementation. Public awareness of such systems is growing daily. Newspapers regularly have articles covering the latest applications of GPS. En route nagivation for aircraft, assisting blind people to navigate the streets of a city, and tracking skiers on slopes are some of the topics of recent newspapers articles on GPS. This article explores GPS asset location systems, looks at their features and foibles, and considers their cost, utility, ease of use, and drawbacks.
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  • 30
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    GPS solutions 1 (1995), S. 28-37 
    ISSN: 1521-1886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Executive Summary GPS is a scientific method used as an adjunct to geographic information systems (GIS) for determining high-accuracy control points over large areas. Recent improvements in receiver technology, differential surveying, and software have made use of GPS technology more practical for smaller GIS projects. This article compares three different GPSs with occupation times of 2 and 12 min using an existing control network, comparing the location of the points and the distances between points. The control network internal distances vary from 40 to 280 m, and within 2000 m of the nearest second-order National Geodetic Survey (NGS) triangulation station. The partnership of GPS and GIS will lead to higher surveying integrity while improving digital mapping on the ground over small and large areas. It also allows for postsurvey analysis with solutions coming from multiple base stations. Presented here is a case study of how to achieve highly accurate and effective control points using using GPS/GIS, particularly for a small area.
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  • 31
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    GPS solutions 1 (1995), S. 65-73 
    ISSN: 1521-1886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: The NAVSTAR Global Positioning System is a space-based, all-weather, worldwide satellite navigation system. GPS uses the constellation of satellites and associated ground equipment to perform the primary missions of highly accurate navigation, time transfer, and nuclear detonation detection. To achieve these missions, GPS has three clearly defined segments – space, user and control (see Figure 1). The control segment, otherwise referred to as the operational control segment (OCS), consists of the personnel and equipment that controls the space segment and interfaces with the user segment. The OCS is made up of the master control station (MCS), the ground antennas (GA), and the monitor stations (MS). The purpose of this article is to describe how the 2nd Space Operations Squadron runs the MCS, the key element of the OCS.
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  • 32
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    GPS solutions 1 (1995), S. 74-75 
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  • 33
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    GPS solutions 1 (1995), S. 76-79 
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  • 34
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    GPS solutions 1 (1995), S. 80-80 
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  • 35
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    GPS solutions 1 (1995), S. 85-85 
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  • 36
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    Stochastic environmental research and risk assessment 4 (1990), S. 27-41 
    ISSN: 1436-3259
    Keywords: Groundwater monitoring networks ; Information reliability ; Information scales ; Kalman filtering in groundwater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract The extensive use of groundwater resources has increased the need for developing cost-effective monitoring networks to provide an indication of the degree to which the subsurface environment has been affected by human activities. This study presents a cost-effective approach to the design of groundwater flow monitoring networks. The groundwater network design is formulated with two problem formats: maximizing the statistical monitoring power for specified budget constraint and minimizing monitoring cost for statistical power requirement. The statistical monitoring power constraint is introduced with an information reliability threshold value. A branch and bound technique is employed to select the optimal solution from a discrete set of possible network alternatives. The method is tested to the design of groundwater flow monitoring problem in the Pomona County, California.
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    Stochastic environmental research and risk assessment 4 (1990), S. 65-81 
    ISSN: 1436-3259
    Keywords: Lagoons ; Ponds ; Facultative ; First-order kinetics ; Complete mixing ; Probabilistic ; Uncertainty ; Environmental ; Stochastic differential equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Two stochastic models are developed to describe the BOD output (i.e. effluent) variation of facultative aerated lagoons in series. One of the models uses the uncertainty analysis (UA) technique and the other is based on the moment equation solution methodology of stochastic differential equations (SDE's). The former considers a second-order approximation of the expectation (SOAE) and a first-order approximation of the variance (FOAV). The SDE model considers that output variability is accounted for by random variations in the rate coefficient. Comparisons are provided. Calibration and verification of the two models are aciieved by using field observations from two different lagoon systems in series. The predictive performances of the two models are compared with each other and with another SDE model, presented in a previous paper, that considers input randomness. The three methods show similar predictive performances and provide good predictions of the mean and standard deviation of the lagoon effluent BOD concentrations and thus are considered as appropriate methodologies.
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  • 38
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    Stochastic environmental research and risk assessment 4 (1990), S. 89-103 
    ISSN: 1436-3259
    Keywords: maximum precipitation depths ; extreme-value distributions ; seasonal variation ; partial duration series ; model misspecification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Quantile estimates of the annual maximum distribution can be obtained by fitting theoretical distributions to the maxima in separate seasons, e.g. to the monthly maxima. In this paper, asymptotic expressions for the bias and the variance of such estimates are derived for the case that the seasonal maxima follow a Gumbel distribution. Results from these expressions are presented for a situation with no seasonal variation and for maximum precipitation depths at Uccle/Ukkel (Belgium). It is shown that the bias is often negligible and that the variance reduction by using seasonal maxima instead of just the annual maxima strongly depends on the seasonal variation in the data. A comparison is made between the asymptotic standard error of quantile estimates from monthlymaxima with those from a partial duration series. Much attention is paid to the effect of model misspecification on the resulting quantile estimates of the annual maximum distribution. The use of seasonal maxima should be viewed with caution when the upper tail of this distribution is of interest.
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    Stochastic environmental research and risk assessment 4 (1990), S. 193-208 
    ISSN: 1436-3259
    Keywords: Stochastic tidal modeling ; parameter identification ; model calibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract In this paper a parameter estimation algorithm is developed to estimate uncertain parameters in two dimensional shallow water flow models. Since in practice the open boundary conditions of these models are usually not known accurately, the uncertainty of these boundary conditions has to be taken into account to prevent that boundary errors are interpreted by the estimation procedure as parameter fluctuations. Therefore the open boundary conditions are embedded into a stochastic environment and a constant gain extended Kalman filter is employed to identify the state of the system. Defining a error functional that measures the differences between the filtered state of the system and the measurements, a quasi Newton method is employed to determine the minimum of this functional. To reduce the computational burden, the gradient of the criterium that is required using the quasi Newton method is determined by solving the adjoint system.
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  • 40
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    Stochastic environmental research and risk assessment 4 (1990), S. 217-226 
    ISSN: 1436-3259
    Keywords: Exponential distribution ; bivariate exponential distribution ; distribution of flood volume ; partial duration series
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A methodology based on the theory of stochastic processes is applied to the analysis of floods. The approach will be based on some results of the theory of extreme values over a threshold. In this paper, we focus on the estimation of the distribution of the flood volume in partial duration series analysis of flood phenomena, by using a bivariate exponential distribution of discharge exceedances and durations over a base level.
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    Stochastic environmental research and risk assessment 4 (1990), S. 254-254 
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    Stochastic environmental research and risk assessment 4 (1990), S. 277-294 
    ISSN: 1436-3259
    Keywords: Water distribution ; optimization ; nonlinear programming ; integer programming ; chance constraints ; rehabilation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract This paper presents the mathematical development of an integer — nonlinear programming chance — constrained optimization model for the minimum cost rehabilitation/replacement of water distribution system components. Particular attention is given to the handling of uncertainties in the roughness factors and the loading conditions including both the random demand and preassure head requirements. The advantages of the proposed model include the ability to: 1) handle the optimal timing of rehabilitation/replacement for water distribution system components; 2) link a mixed-integer linear program solver, a nonlinear program solver, and a hydraulic simulator into an optimization framework; 3) handle the uncertainties of some of the variables; 4) incorporate various kinds of cost functions; and 5) handle multiple loading conditions.
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    Stochastic environmental research and risk assessment 4 (1990), S. 309-320 
    ISSN: 1436-3259
    Keywords: Entropy ; reliability ; redundancy ; water distribution networks ; nodal pair reliability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Entropy based expressions for measurement of reliability and redundancy have recently been reported. These measures approach assessment of the reliability of the distribution network from the intrinsic redundancy of the network layout. The paper extends earlier work on entropy functions by including a more explicit statement of the alternate paths available in the network and by recognizing that under certain circumstances, e.g., failure of some part of the network work, an outflow link from a node under normal working condition may become an inflow link to the same node. The measures are assessed by comparison with parameters measuring Nodal Pair Reliability and percentage of flow supplied at adequate pressure for a range of networks and link failure conditions in this networks. The entropy measures are shown to reflect changes in the network reliability, as measured by these two comparative parameters, very well.
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    Stochastic environmental research and risk assessment 9 (1995), S. 33-47 
    ISSN: 1436-3259
    Keywords: Hidden markov models ; maximum likelihood estimation ; EM algorithm ; martingale estimating function ; forward-backward algorithm ; Monte Carlo ; filtering ; Nash cascade model ; rainfall runoff modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Many stochastic process models for environmental data sets assume a process of relatively simple structure which is in some sense partially observed. That is, there is an underlying process (Xn, n ≥ 0) or (Xt, t ≥ 0) for which the parameters are of interest and physically meaningful, and an observable process (Yn, n ≥ 0) or (Yt, t ≥ 0) which depends on the X process but not otherwise on those parameters. Examples are wide ranging: the Y process may be the X process with missing observations; the Y process may be the X process observed with a noise component; the X process might constitute a random environment for the Y process, as with hidden Markov models; the Y process might be a lower dimensional function or reduction of the X process. In principle, maximum likelihood estimation for the X process parameters can be carried out by some form of the EM algorithm applied to the Y process data. In the paper we review some current methods for exact and approximate maximum likelihood estimation. We illustrate some of the issues by considering how to estimate the parameters of a stochastic Nash cascade model for runoff. In the case of k reservoirs, the outputs of these reservoirs form a k dimensional vector Markov process, of which only the kth coordinate process is observed, usually at a discrete sample of time points.
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    Stochastic environmental research and risk assessment 9 (1995), S. 117-132 
    ISSN: 1436-3259
    Keywords: River Quality ; network ; computer model ; Thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract In this paper, concepts of network thermodynamics are applied to a river water quality model, which is based on Streeter-Phelps equations, to identify the corresponding physical components and their topology. Then, the randomness in the parameters, input coefficients and initial conditions are modeled by Gaussian white noises. From the stochastic components of the physical system description of problem and concepts of physical system theory, a set of stochastic differential equations can be automatically generated in a computer and the recent developments on the automatic formulation of the moment equations based on Ito calculus can be used. This procedure is illustrated through the solution of an example of stochastic river water quality problem and it is also shown how other related problems with different configurations can be automatically solved in a computer using just one software.
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    Stochastic environmental research and risk assessment 9 (1995), S. 171-205 
    ISSN: 1436-3259
    Keywords: AR-AIC-Bayes filter ; autoregressive spectral density estimation ; diagnostic checks for ARMA models ; exploratory data analysis ; fast Fourier transform ; Hurst coefficient ; long-memory times series ; periodogram smoothing ; riverflow time series ; spectral density plots
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Current methods of estimation of the univariate spectral density are reviewed and some improvements are made. It is suggested that spectral analysis may perhaps be best thought of as another exploratory data analysis (EDA) tool which complements, rather than competes with, the popular ARMA model building approach. A new diagnostic check for ARMA model adequacy based on the nonparametric spectral density is introduced. Additionally, two new algorithms for fast computation of the autoregressive spectral density function are presented. For improving interpretation of results, a new style of plotting the spectral density function is suggested. Exploratory spectral analyses of a number of hydrological time series are performed and some interesting periodicities are suggested for further investigation. The application of spectral analysis to determine the possible existence of long memory in natural time series is discussed with respect to long riverflow, treering and mud varve series. Moreover, a comparison of the estimated spectral densities suggests the ARMA models fitted previously to these datasets adequately describe the low frequency component. Finally, the software and data used in this paper are available by anonymous ftp from fisher.stats.uwo.ca.
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    Stochastic environmental research and risk assessment 9 (1995), S. 215-237 
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    Keywords: Computation ; discretization ; entropy ; networks ; time averaging ; water quality
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    Notes: Abstract The computational aspects of using a new, entropy-based, theory to predict water quality values at discontinued water quality monitoring stations are discussed. The main computational issues addressed are the level of discretization used in converting the continuous probability distribution of water quality values to the discrete levels required for the entropy function, and the choice of the interval of time for which to assign the value of the water quality (period of time averaging) through the entropy function. Unlike most cases of entropy applications involving discretization of continuous functions the results of using entropy theory to predict water quality values at discontinued monitoring stations in this application appear to be insensitive to the choice of the level of discretization even down to the very coarse level discretization associated with only eight intervals. However, depending on the length of record available the choice of the time interval for which the water quality values are assigned (period for time averaging) appear to have a significant impact on the accuracy of the results.
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    Stochastic environmental research and risk assessment 4 (1990), S. 1-26 
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    Keywords: Inverse ; calibration ; estimation ; groundwater flow
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    Notes: Abstract The development of stochastic methods for groundwater flow representation has undergone enormous expansion in recent years. The calibration of groundwater models, the inverse problem, has lately received comparable attention especially and almost exclusively from the stochastic perspective. In this review we trace the evolution of the methods to date with a specific view toward identifying the most important issues involved in the usefulness of the approaches. The methods are critiqued regarding practical usefulness, and future directions for requisite study are discussed.
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  • 49
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    Stochastic environmental research and risk assessment 4 (1990), S. 55-64 
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    Keywords: Predictive distribution ; Bayesian approximation ; parameter uncertainty ; non-informative prior ; method of moments ; Gumbel distribution ; maximum likelihood estimates
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    Notes: Abstract In this paper Lindley's Bayesian approximation procedure is used to obtain the Bayes estimate of the probability of exceedence of a flood discharge. The Bayes estimates of the probability of exceedence has been shown by S.K. Sinha to be equivalent to the estimate of the probability of exceedence from the predictive or Bayesian disribution, of a future flood discharge. The evaluation of complex ratios of multiple integrals common in a Bayesian analysis is not necessary using Lindley's procedure. The Bayes estimates are compared to those obtained by the method of maximum likelihood and the method of moments. The results show that Bayes estimates of the probability of exceedence are larger as expected, but have smaller posterior standard deviations.
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    Stochastic environmental research and risk assessment 4 (1990), S. 105-119 
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    Keywords: Kalman filtering ; Optimal smoothing ; Shallow water equations ; Wind stress ; On-line prediction
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    Notes: Abstract Using the state space approach, an on-line filter procedure for combined wind stress identification and tidal flow forecasting is developed. The stochastic dynamic approach is based on the linear twodimensional shallow water equations. Using a finite difference scheme, a system representation of the model is obtained. To account for uncertainties, the system is embedded into a stochastic environment. By employing a Kalman filter, the on-line measurements of the water-level available can be used to identify and predict the shallow water flow. Because it takes a certain time before a fluctuation in the wind stress can be noticed in the water-level measurements, an optimal fixed-lag smoother is used to identify the stress.
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    Stochastic environmental research and risk assessment 4 (1990), S. 135-150 
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    Keywords: Radar ; rainfall prediction ; real-time prediction
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    Notes: Abstract A computational method for the determination of rainfall distribution for applications in short term rainfall prediction is presented here. The method is strongly influenced by the experience gained from the observation and analysis of data gathered on a heavy rainfall event in 1986 that occurred during the Baiu Season in Japan. The method is based on the concept that rainfall occurs as an interaction between an instability field, appropriately modeled, and a field of water vapor under the influence of topography. The results from this computational method showed good agreement with the temporal variation in the rainband that moved across the observation field in 1986. Towards determination of the parameters in the computational model, another method for the determination of the rainfield is also developed. This second method determines the rainfall distribution from estimation of the conversion rate of water vapor to liquid water through use of data from a three dimensional scanning radar. The results are consistent with those obtained from the first method.
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    Stochastic environmental research and risk assessment 4 (1990), S. 151-160 
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    Keywords: Instantaneous Unit Hydrograph ; Conceptual models ; Stochastic differential equations
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    Notes: Abstract Recognizing that simple watershed conceptual models such as the Nash cascade ofn equal linear reservoirs continue to be reasonable means to approximate the Instantaneous Unit Hydrograph (IUH), it is natural to accept that random errors generated by climatological variability of data used in fitting an imprecise conceptual model will produce an IUH which is random itself. It is desirable to define the random properties of the IUH in a watershed in order to have a more realistic hydrologic application of this important function. Since in this case the IUH results from a series of differential equations where one or more of the uncertain parameters is treated in stochastic terms, then the statistical properties of the IUH are best described by the solution of the corresponding Stochastic Differential Equations (SDE's). This article attempts to present a methodology to derive the IUH in a small watershed by combining a classical conceptual model with the theory of SDE's. The procedure is illustrated with the application to the Middle Thames River, Ontario, Canada, and the model is verified by the comparison of the simulated statistical measures of the IUH with the corresponding observed ones with good agreement.
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    Stochastic environmental research and risk assessment 9 (1995), S. 13-32 
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    Keywords: Distributed parameter filter ; shallow water equations ; distributed dynamical systems ; data assimilation ; white Gaussian noise
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    Notes: Abstract Distributed parameter filtering theory is employed for estimating the state variables and associated error covariances of a dynamical distributed system under highly random tidal and meteorological influences. The stochastic-deterministic mathematical model of the physical system under study consists of the shallow water equations described by the momentum and continuity equations in which the external forces such as Coriolis force, wind friction, and atmospheric pressure are considered. White Gaussian noises in the system and measurement equations are used to account for the inherent stochasticity of the system. By using an optimal distributed parameter filter, the information provided by the stochastic dynamical model and the noisy measurements taken from the actual system are combined to obtain an optimal estimate of the state of the system, which in turn is used as the initial condition for the prediction procedure. The approach followed here has numerical approximation carried out at the end, which means that the numerical discretization is performed in the filtering equations, and not in the equations modelling the system. Therefore, the continuous distributed nature of the original system is maintained as long as possible and the propagation of modelling errors in the problem is minimized. The appropriateness of the distributed parameter filter is demonstrated in an application involving the prediction of storm surges in the North Sea. The results confirm excellent filter performance with considerable improvement with respect to the deterministic prediction.
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    Stochastic environmental research and risk assessment 9 (1995), S. 77-88 
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    Keywords: Extreme rainfalls ; partial duration series ; regional estimation ; Bayes' theory
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    Notes: Abstract Based on the Partial Duration Series model a regional Bayesian approach is introduced in the modelling of extreme rainfalls from a country-wide system of recording raingauges in Denmark. The application of the Bayesian principles is derived in case of both exponential and generalized Pareto-distributed exceedances. The method is applied to, respectively, the total precipitation depth and the maximum 10 minutes rain intensity of individual storms from 41 stations. By means of the regional analysis prior distributions of the parameters in the Partial Duration Series model are estimated. It is shown that the regional approach significantly reduces the uncertainty of the T-year event estimator compared to estimation based solely on at-site data. In addition, the regional approach provides quantile estimates at non-monitored sites.
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    Stochastic environmental research and risk assessment 4 (1990), S. 175-191 
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    Keywords: Flow through porous media ; random network ; macro-permeability ; micro-geometry ; statistical mechanics ; anisotropy
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    Notes: Abstract This paper presents an analysis of Hagen-Poiseulle flow through plane random anisotropic networks of interconnected channels. Macroscopic permeability tensor of the network is expressed in terms of statistico-geometrical characteristics like the degree of anisotropy in channel orientations, average co-ordination number of the network and first two moments of channel length distribution. Analytical results are illustrated and verified using numerical analysis of flow in a simulated random network. The emphasis of the paper is on the effects of anisotropy on distributions of flow rates in channels. It is shown that, due to anisotropy the maximum flow rate generally occurs in channels that are not aligned along the direction of the macroscopic pressure gradient.
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    Stochastic environmental research and risk assessment 4 (1990), S. 253-254 
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    Stochastic environmental research and risk assessment 4 (1990), S. 241-251 
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    Keywords: Sedimentation ; Large Reservoirs ; Markov Chains
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    Notes: Abstract Sediment deposition and its accumulation in a large resorvoir depends on the inflow and reservoir storage content, respectively. Because of this fact it is possible to model the cumulative deposition of sediment as an additive process defined on a bivariate Markov chain. Using the bivariate Markov chain model the mean and variance of the cumulative deposition of John Martin Reservoir, Colorado, U.S.A. are estimated and compared with observed sedimentation data.
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    Stochastic environmental research and risk assessment 4 (1990), S. 295-308 
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    Keywords: Risk-based design ; uncertainty analysis ; hydraulic design ; bridge ; culvert
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    Notes: Abstract For a proposed highway bridge or culvert, the total cost to the public during its expected service life includes capital investment on the structures, regular operation and maintenance costs, and various flood related costs. The flood related damage costs include items such as replacement and repair costs of the highway bridge or culvert, flood plain property damage costs, users costs from traffic interruptions and detours, and others. As the design discharge increases, the required capital investment increases but the corresponding flood related damage costs decrease. Hydraulic design of a bridge or culvert using a riskbased approach is to choose among the alternatives the one associated with the least total expected cost. In this paper, the risk-based design procedure is applied to pipe culvert design. The effect of the hydrologic uncertainties such as sample size and type of flood distribution model on the optimal culvert design parameters including design return period and total expected cost are examined in this paper.
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    Stochastic environmental research and risk assessment 9 (1995), S. 49-75 
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    Keywords: Flood frequency analysis ; index flood estimators ; L-moments ; GEV distribution ; regionalization ; probability weighted moments
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    Notes: Abstract Our results illustrate the performance of at-site and regional GEV/PWM flood quantile estimators in regions with different coefficients of variation, degrees of regional heterogeneity, record lengths, and number of sites. Analytic approximations of bias and variance are employed. For realistic GEV distributions and short records, the index-flood quantile estimator performs better than a 2-parameter GEV/PWM quantile estimator with a regional shape parameter, or a 3-parameter at-site GEV/PWM quantile estimator, in both humid and especially in arid regions, as long as the degree of regional heterogeneity is moderate. As regional heterogeneity or record lengths increases, 2-parameter estimators quickly dominate. Flood frequency models that assign probabilities larger than 2% to negative flows are unrealistic; experiments employing such distributions provide questionable results. This appraisal generally demonstrates the value of regionalizing estimators of the shape of a flood distribution, and sometimes the coefficient of variation.
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    Stochastic environmental research and risk assessment 9 (1995), S. 105-116 
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    Keywords: Nonlocal ; transport ; dispersion ; heterogeneity ; integro-differential
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    Notes: Abstract Analysis from a number of different perspectives has shown diffusion and dispersion in natural porous formations to generally be nonlocal in character, i.e., the mass balance involves integro-partial differential equations. Only in certain asymptotic limits do these laws localize to classical partial differential equations. Compiled within is a resume of nonlocal laws that our group has developed over the last few years for systems with physical, chemical and biological heterogeneity. Analytical tools used to obtain these laws are nonequilibrium and equilibrium statistical mechanics, and first-order spectral-perturbation methods. This paper is an expansion of the material presented at the Waterloo conference held in the memory of Dr. Unny.
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    Stochastic environmental research and risk assessment 9 (1995), S. 133-149 
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    Keywords: moment-equations ; state-space ; numerical integration
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    Notes: Abstract The generation of the second and higher order moment equations for a set of stochastic differential equations based on Ito's differential lemma is difficult, even for small system of equations. From the knowledge of the statistical properties of the Gaussian white noises associated with the parameters and input coefficients of a set of stochastic differential equations of typeA.Ż+B.Z=C(t), a way to automatically generate the second order moment equations in a computer is presented in this paper. The resulting set of first and second order moment equations is also presented in the same state-space form of the original set of stochastic differential equations through a vectorization of the correlation matrix, which takes advantage of its symmetry. The procedure involved here avoids the inversion of matrixA to apply Ito's differential lemma. Therefore, the presented numerical implementation reduces the computational effort required in the formulation and solution of the moment equations. Moreover, other robust and efficient numerical deterministic integration schemes can be equally applied to the solution of the moment equations.
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    Stochastic environmental research and risk assessment 9 (1995), S. 238-238 
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    Stochastic environmental research and risk assessment 9 (1995), S. 269-296 
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    Keywords: Stochastic analysis ; diagrams ; groundwater flow
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    Notes: Abstract We present a diagrammatic method for solving stochastic 1-D and 2-D steady-state flow equations in bounded domains. The diagrammatic method results in explicit solutions for the moments of the hydraulic head. This avoids certain numerical constraints encountered in realization-based methods. The diagrammatic technique also allows for the consideration of finite domains or large fluctuations, and is not restricted by distributional assumptions. The results of the method for 1-D and 2-D finite domains are compared with those obtained through a realization-based approach. Mean and variance of head are well reproduced for all log-conductivity variances inputted, including those larger than one. The diagrammatic results also compare favorably to hydraulic head moments derived by standard analytic methods requiring a linearized form of the flow equation.
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    Stochastic environmental research and risk assessment 4 (1990), S. 255-276 
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    Keywords: Stochastic hydrologic process ; daily discharges ; correlated generation ; simulation
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    Notes: Abstract A geomorphological study at the confluence of the Danube and the Isar in Bavaria required long series of daily discharges in both rivers. A model that generates simultaneous correlated streamflows in both rivers was developed and tested. The model is a modified shot noise model, first developed by Treiber (1975) for a single river, that was adapted to two rivers. It generates correlated pulses of events that produce flow for each river, and these pulses are then convoluted with a river specific systems function. The model, after being calibrated for the two rivers on the basis of 85 years of records, yields artificial series of discharges, in which the statistical properties of the historical records are reproduced. The performance of the model was tested with 20 generated series each 100 years long.
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    Stochastic environmental research and risk assessment 4 (1990), S. 321-321 
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    Stochastic environmental research and risk assessment 4 (1990), S. 43-53 
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    Keywords: Missing data ; Interpolation in hydrology ; Multichannel precipitation time series ; Spectral analysis
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    Notes: Abstract The accuracy of an optimum interpolation technique in filling missing values in multichannel (or multisite) hydrologic series containing time-coincident data gaps is examined. The applied methodology is based on the maximum entropy method (MEM) of spectral estimation or multivariate autoregressive modeling and heavily depends upon the properties of multichannel prediction error filter (PEF). Six precipitation time series spatially located within a hydrologic basin are used and time-coincident artificial gaps are created in all six series. The performance of the technique is assessed by comparing the filled-in series to the observed and by employing spectral analysis. The results reveal the usefulness of the method in multichannel hydrologic analysis.
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    Stochastic environmental research and risk assessment 4 (1990), S. 83-88 
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    Stochastic environmental research and risk assessment 4 (1990), S. 121-134 
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    Keywords: Hydrologic time series ; Linearity ; Gaussianity ; Hinich's test
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    Notes: Abstract Although the non-Gaussian nature of many hydrologic time series is well recognized and their nonlinearity is suspected, neither property is well tested. This situation has existed partly because of a lack of appropriate tests. Recently Hinich (1982) has developed a test to test the linearity of time series which is based on the bispectral characteristics of the series. This test is used in this study to investigate the linearity and non-Gaussian characteristics of annual and daily rainfall and runoff series. The annual series may be modeled by linear models with Gaussian inputs. The daily data, on the other hand, often demonstrate nonlinear characteristics and are non-Gaussian as well.
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    Stochastic environmental research and risk assessment 4 (1990), S. 161-174 
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    Keywords: advection-diffusion equation ; random walk model ; random flight model ; stochastic differential equation ; Fokker-Planck equation
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    Notes: Abstract A random walk model to describe the dispersion of pollutants in shallow water is developed. By deriving the Fokker-Planck equation, the model is shown to be consistent with the two-dimensional advection-diffusion equation with space-varying dispersion coefficient and water depth. To improve the behaviour of the model shortly after the deployment of the pollutant, a random flight model is developed too. It is shown that over long simulation periods, this model is again consistent with the advection-diffusion equation. The various numerical aspects of the implementation of the stochastic models are discussed and finally a realistic application to predict the dispersion of a pollutant in the Eastern Scheldt estuary is described.
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    Stochastic environmental research and risk assessment 9 (1995), S. 1-11 
    ISSN: 1436-3259
    Keywords: Environmental management ; extreme values ; hydrology ; stochastic differential equations ; sustainable development ; time series analysis
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    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Recent developments in stochastic and statistical methods in hydrology and environmental engineering presented in the upcoming sequence of research papers are evaluated, compared and put into proper perspective. These papers are being published as a memorial to Professor T. E. Unny who was a founding Editor of the journalStochastic Hydrology and Hydraulics. As explained in this introductory paper, other activities that took place to celebrate Professor Unny's lifetime academic accomplishments include an international conference held in his honor at the University of Waterloo in June, 1993 and the publication of a four-volume conference proceedings in 1994.
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    Stochastic environmental research and risk assessment 9 (1995), S. 89-104 
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    Keywords: 3D subsurface flow ; stochastic transport ; statístical anisotropy ; heterogeneous porous media
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    Notes: Abstract A methodology for generating three dimensional (3D) flow fields for statistically anisotropic heterogeneous porous media is presented and demonstrated. The simulated flow fields are shown to exhibit the input spatial correlation structure and observe mass continuity. Sample flow fields are presented in the form of cross sectional slices of the 3D formation. These cross sections demonstrate visually the characteristics of subsurface flow. The method was found to be faster than traditional techniques in terms of its computational requirements. Given this method, it is possible to generate the large number of realizations of a velocity field necessary to compute high order statistics in transport problems.
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    Stochastic environmental research and risk assessment 9 (1995), S. 151-170 
    ISSN: 1436-3259
    Keywords: Environmental regulation ; compliance ; game theory ; whistle-blowing ; reporting system ; water quality management
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    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A formal mathematical model is developed to ascertain the effectiveness of a reporting system for improving the enforcement of environmental laws and regulations when reports are costly. To model realistic enforcement problems arising over environmental issues such as compliance to water and air quality standards, a formal enforcement model is constructed using concepts from probability and statistics, non-cooperative game theory, and economics. In order to demonstrate clearly the benefits gained when an environmental agency takes advantage of a reporting system, a formal enforcement model with a costly reporting system is rigorously compared to one with no reporting system. The calculation and comparison of Nash equilibria for a range of values of model parameters indicates under what conditions a reporting system can be truly effective. Overall, it is found that a reporting system, such as whistle-blowing, can be helpful for reducing violations of environmental standards, thereby maintaining better environmental quality.
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    Stochastic environmental research and risk assessment 9 (1995), S. 207-213 
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    Keywords: Abelson-Tukey coefficients ; binary time series ; detection ; floods ; monotone trend ; point process ; Rio Negro ; time series ; trend
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    Notes: Abstract A sequence of occurrence times of floods may be considered to be part of a realization of a binary-valued time series or of a stochastic point process. In this paper a criterion for detecting the presence of a monotonic trend in the rate of the process is considered. The criterion is based on linear functions of the data with the coefficients chosen to emphasize a monotonic rate. In the case that the process is stationary and mixing, the null distribution of the test statistic is approximately standard normal.
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    Stochastic environmental research and risk assessment 9 (1995), S. 239-267 
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    Keywords: Stochastic analysis ; multiphase flow ; porous media
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    Notes: Abstract Stochastic analysis of steady-state multiphase (water, oil, and air) flow in heterogeneous porous media was performed using the perturbation theory and spectral representation techniques. The gas phase is assumed to have constant pressure. The governing equations describing the flow of oil and water are coupled and nonlinear. The key stochastic input variables are intrinsic permeability,k, and the soil grain size distribution index, α. Three different stochastic combinations of these two input parameters were considered. The perturbation/spectral analysis was used to develop closed-form expressions that describe stochastic variability of key output processes, such as capillary and individual phase pressures and specific discharges. The analysis also included the derivation of the mean flow equations and estimation of the effective flow properties. The impact of the spatial variability ofk and α on the effective conductivities and the variances of pressures and specific discharges was examined.
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    Stochastic environmental research and risk assessment 9 (1995), S. 297-323 
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    Keywords: Stochastic analysis ; unsaturated transport ; fractals
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    Topics: Architecture, Civil Engineering, Surveying , Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract Within the framework of stochastic theory and the spectral perturbation techniques, three-dimensional dispersion in partially saturated soils with fractal log hydraulic conductivity distribution is analyzed. Our analysis is focused on the impact of fractal dimension of log hydraulic conductivity distribution, local dispersivity, and unsaturated flow parameters, such as the soil poresize distribution parameter and the moisture distribution parameter, on the spreading behavior of solute plume and the concentration variance. Approximate analytical solutions to the stochastic partial differential equations are derived for the variance of asymptotic solute concentration and asymptotic macrodispersivities.
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    Fire technology 31 (1995), S. 1-2 
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    Fire technology 31 (1995), S. 3-4 
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  • 78
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    Fire technology 31 (1995), S. 279-284 
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    Fire technology 31 (1995), S. 244-264 
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    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Since fire and burns are the second leading cause of injury to young children up to age 4, fire and burn prevention education and training must reach the people who care for young children to be effective. Increasingly larger percentages of young children are cared for in out-of-home settings, including child-care centers and family child-care facilities. The majority of children, however, are still cared for by their parents or other relatives, for all or part of the day. Thus, there was a need for an injury prevention program for child-care providers in different settings. A group of experts in a variety of fields developed a burn prevention curriculum as part of a comprehensive injury prevention project. These experts represent a variety of related fields, including injury prevention, early childhood education, child-care administration, instructional design, and evaluation. Operators of child-care facilities, parents, and care providers were involved in the planning and implementation of a training workshop. The program was tested with 141 child-care providers at seven sites. Subjects included child-care center staff, family child-care operators, and parents of young children. Materials included an instructor manual, coursebook, video, and test booklet. Subjects' knowledge, attitudes, and practices intentions were tested before and after the training. Subjects also completed a program evaluation. Results indicated significant improvement in knowledge, attitudes, and practices intentions for the total group and for subjects at each site. Gains made by center staff and family day-care providers were significant on all three measures, as they were for parents on knowledge and practices. Measures of attitudes and injury prevention practices indicated a high level of acceptance of program goals. A large majority of the subjects said the program was useful and interesting. An analysis of the test results by objective indicated that subjects had improved their knowledge scores on each objective. They had the highest achievement on topics related to understanding characteristics of burns and understanding the hazards and prevention techniques related to smoke, matches, lighters, and hot surface burns. An important finding was that child-care providers in different environments can be instructed in burn prevention using the same program.
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  • 80
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    Keywords: risk ; flammable liquid ; hazard ; probability ; sprinkler
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    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract A fire risk analysis modeling framework was developed to analyze options for fire-safe handling and storing of flammable and combustible liquids in containers. The model illustrates the application of general risk analysis modeling principles to a current, highly visible problem and introduces some new modeling elements. Risk is driven by relative success in providing a complete, operational sprinkler system adequate for controlling fires that start in ordinary combustibles, well away from the liquid products.
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    Fire technology 31 (1995), S. 307-335 
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    Notes: Abstract A computer code, ICARUS (Injuries CAused by Radiation Upon the Skin), has been developed for evaluating time to second-degree burn injury caused by thermal radiation. This paper introduces the modeling methodology incorporated in ICARUS and illustrates the code's validity and application. ICARUS enables studies of the effects of thermal radiation on the skin and benefits assessments of the shielding effects of clothing layers. ICARUS uses a unique method of solving the complex heat transfer problem associated with simultaneous radiation, conduction, and convection in a multilayered diathermanous clothing/skin assembly, which is especially useful when coupled with the thermal responses (moisture loss, charring, shrinking, and so on) of the clothing fabrics themselves. The code is designed to run on an IBM-PC compatible.
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  • 82
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    Fire technology 31 (1995), S. 372-374 
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    Fire technology 26 (1990), S. 51-74 
    ISSN: 1572-8099
    Keywords: Mine fire stoppings ; flame passage ; smoke passage ; concrete stoppings ; steel stoppings ; mine fire simulation ; Bruceton Experimental Mine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The U.S. Bureau of Mines constructed a facility in the multiple-entry section of its Bruceton Experimental Mine to evaluate the fire endurance of mine stoppings. The test stopping (up to 6 ft high by 18 ft wide) is subjected to a 70 min, 75,000 Btu/min liquid fuel tray fire. The stopping and adjacent areas are instrumented with thermocouples and heat flux gauges. Two 8 in. thick concrete block stoppings and a galvanized steel stopping were evaluated in four tests. A crack developed on the fire-exposed surface of both block stoppings where the flames were most intense. However, the unexposed surface of the stoppings was undamaged and its maximum temperature was about 80°C. The steel stopping retained its structural integrity during the test. The temperature of the unexposed steel surface reached 490°C, but combustible materials located 1 ft from the surface did not ignite. Heat energy transmitted across the steel stopping was approximately halved when a 3/4 in. thick coating of construction plaster was applied to its fire-exposed surface. All stoppings prevented the passage of flame and smoke.
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    Fire technology 26 (1990), S. 75-81 
    ISSN: 1572-8099
    Keywords: Air leakage ; door assemblies ; door seals ; laminar flow ; pressure drop ; smoke control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract A generalized, nondimensional relationship for flow through defined narrow gaps is used to predict leakage flow past closed door assemblies. Typical gap shapes considered include straight-through; single or double sharp (90°) bends; baffle at leading edge; comb-type labyrinth; and filament brush seal. Applications for prediction and design appropriate to smoke control systems are indicated.
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    Fire technology 26 (1990), S. 97-98 
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    Fire technology 26 (1990), S. 94-96 
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    Fire technology 26 (1990), S. 99-105 
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    Keywords: Fire plume ; flashover ; fire modeling ; conservation concepts ; oxygen factor
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  • 88
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    Fire technology 26 (1990), S. 106-120 
    ISSN: 1572-8099
    Keywords: Roof vents ; wind flows ; buoyancy ; convection ; gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Natural convection roof vents are widely used in industrial and other buildings for clearing smoke and toxic gases produced by fires and explosions. In the design of such vents where hot gases are driven out by pressure differences, it has been a common practice to ignore the effects of outside wind. Buoyancy is assumed to be the only driving force. This paper shows that under certain wind conditions the effects of wind can completely override buoyancy, causing either flow reversal or inefficient extraction. A new design method, based on wind tunnel measurements, is proposed by which the effects of wind can be taken into account. A worked example is presented to illustrate the method.
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  • 89
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    Fire technology 26 (1990), S. 149-155 
    ISSN: 1572-8099
    Keywords: fires ; life safety ; codes ; large buildings ; human behavior ; evacuation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract In recent years research into human behavior in fires has been carried out in several countries for improving provisions for life safety currently prescribed in firesafety codes. This technical note reviews briefly the findings of human behavior studies in the United Kingdom with particular reference to buildings with a large number of people at risk. According to one of the main conclusions of this paper, for successful evacuation, early detection should be followed by timely and convincing communication to building occupants information about the existence, location, and spread of fire. This can be achieved by computer-based informative fire warning systems, which is the subject matter of another technical note.
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    Fire technology 26 (1990), S. 141-148 
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    Keywords: asphyxiation ; antidote ; cyanide ; fire hazard ; polyacrylonitrile ; polyurethane ; pyrolysis ; urea-formaldehyde
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The insidious accumulation of hydrogen cyanide from smouldering fires in dwellings to levels that render victims unconscious and facilitate intoxication by carbon monoxide by increasing the ventilation rate may occur more frequently at the present time through the mounting trend toward the use of cheap synthetic materials in building construction and house furnishings. Although in many cases fatalities appear to be due primarily to carbon monoxide, the proportion of deaths in which cyanide intoxication is a decisive contributory factor may have been underestimated. In the circumstances of an emergency the possibility of extensive exposure to cyanide cannot be excluded. Treatment of all fire victims overcome by toxic fumes with an innocuous cyanide antidote immediately upon removal from the affected premises therefore appears necessary.
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  • 91
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    Keywords: Halons ; SF6 ; simulants
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    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract All new and retrofit installations of Halon 1301 total flooding fire protection systems in U.S. Navy shipboard machinery spaces require an acceptance discharge test. The primary reason for this testing is the verification of system design and performance (discharge time, initial concentration, maintenance of concentration, etc.). It is desirable to use a simulant instead of Halon 1301 in these tests in view of its contribution to stratospheric ozone depletion. Two candidate simulants, sulfur hexafluoride (SF6) and chlorodifluoromethane (R-22 or Halon 121), were evaluated on the basis of flow through the piping networks of both modular and banked systems. Two modular systems, with differing fill densities, and six banked systems, varying in complexity from a two-nozzle balanced system to a four-nozzle unbalanced system, were used in this evaluation. Sulfur hexafluoride was found to discharge at a similar rate to Halon 1301 while R-22 was found to discharge at a faster rate. The division of flow between branches in the piping networks were similar for both simulants and Halon 1301. Together with previous work on leakage from an enclosure and initial mixing, these tests have shown that sulfur hexafluoride is an excellent simulant for Halon 1301 in acceptance discharge tests of total flooding fire protection systems. These conclusions will need to be confirmed in full-scale tests. The material presented here is extracted from a longer report that is available from the U.S. Naval Research Laboratory, Washington, DC 20375.
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    Fire technology 26 (1990), S. 342-356 
    ISSN: 1572-8099
    Keywords: Fire ; alarm ; sound ; location ; apartment ; awake ; minimum ; level
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Measurements on the alarm sound distribution in nine apartment buildings showed that if adequate awakening potential is to be provided for sleeping residents, an alarm sounding device must be located within each apartment. Information on the minimum sound level necessary to awaken such a sleeping person is also given. A procedure that can be used to determine sound attenuation within apartment buildings is presented. Examples to demonstrate such a procedure are provided.
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  • 93
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  • 94
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    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Three full-scale fire tests were conducted in a commercial manufactured home 4.3 m wide by 18.3 m long with 10° sloped ceilings. The purpose of the tests was to determine the performance of limited water supply (LWS) sprinklers under a sloped ceiling and to determine whether the minimum distance allowed between sprinklers could be reduced from 2.4 m to 1.8 m. Six prototype LWS sprinklers were installed at a spacing of 1.8 m by 2.4 m in the living room/kitchen area, which measured 4.0 m by 7.2 m. The ceiling and walls were combustible in all three tests, and the room was ventilated by three open windows. The fuel package for all three tests consisted of a vinyl-covered chair with polyurethane padding, double-layered curtains (100% polyester and 50% cotton/50% polyester), and a wooden end table. In the first test, the fuel package was placed in a corner; in the second test, along the wall under the apex of the ceiling between two sprinklers; and in the third test, along the longitudinal wall between two sprinklers. In all tests, no more than two sprinklers actuated. The flow rate with one and two sprinklers operating was 38ℓ pm and 49ℓ pm, respectively. Flow after the first sprinkler actuation was maintained for 10 minutes when one sprinkler actuated and for 7 minutes 40 seconds when two sprinklers actuated. The total flow in each of the three tests was 380ℓ. In all three tests, the sprinklers prevented the curtains and wall paneling from becoming involved in the fire during sprinkler operation. Tenability based on carbon monoxide concentration and gas temperature at the 1.5 m level was maintained in all three tests.
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    Fire technology 31 (1995), S. 44-61 
    ISSN: 1572-8099
    Keywords: Lightweight wood trusses ; truss ; wood truss construction ; wood ; gusset plates ; fire resistance ; char ; pyrolysis ; concealed spaces ; structural collapse ; backdraft ; smoke explosion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract Lightweight wood trusses are economical construction elements that combine high strength, light weight, and cost savings. The parallel-chord truss is one of the most common lightweight trusses used in commercial and residential occupancies today. Like all structural components, these trusses are arguably susceptible to failure when exposed to fire. This paper will address fire resistance concerns of parallel-chord, lightweight wood truss floor- and roof-ceiling assemblies, particularly their performance under fire conditions and their susceptibility to construction defects. Because evaluating the effect of fire exposure on both conventional and lightweight wood truss assemblies is so important, considerable supplemental background information on the standard fire test, as it applies to general types of construction, is also provided.
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  • 96
    ISSN: 1572-8099
    Keywords: Flame extinguishment ; thermal mechanisms ; flame quenching ; theory ; heat-absorption sinks ; scaling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract In a continuing study of flame extinguishment,1,2,3,4 we report on scaling studies for dry chemicals on larger heptane diffusion flames (0.29 m2 and 2.32 m2 pans). We demonstrate again that small particle sizes extinguish most effectively. Extinguishment is related to heat absorption by decomposing or vaporizing particles. We show that the limiting particle size for each dry chemical—that is, the maximum size which completely decomposes or vaporizes in the flame—is independent of flame size for the systems studied. We broaden and apply the concept of latent or maximum effectiveness2,3 to pan fires of all sizes. Finally, we describe and characterize an aerodynamic effect in the transport of powders, where large particles with their higher momentum entrain and drag smaller, more effective particles into the flame. We also show that extinction curves, involving the ratio of real-to-latent extinction weight and the proportion of small to large particles, have predictable shapes and predictable quantitative levels for most dry chemicals. We have developed the real-to-latent concept along with scaling equations for agent mixtures and for a wide spectrum of agents and particle sizes.
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    Fire technology 26 (1990), S. 85-93 
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    Fire technology 26 (1990), S. 193-194 
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    Fire technology 26 (1990), S. 195-201 
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  • 100
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    Fire technology 26 (1990), S. 223-243 
    ISSN: 1572-8099
    Keywords: Smoke management ; hazard parameters ; visibility ; carbon monoxide concentration ; temperature rise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract This paper provides an overview of the principal design considerations of smoke management systems for covered malls and atria included in a recently proposed technical guide. The engineering basis for formulating an appropriate design for a smoke management system is presented in the form of algebraic equations and graphs. Techniques to assess the level of life hazard created by a fire in an atrium or covered mall with a smoke management system are discussed. The level of life hazard is expressed in terms of the following hazard parameters: smoke layer depth; visibility through the smoke layer; and the carbon monoxide concentration and temperature rise in the smoke layer.
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