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  • Articles  (3)
  • Animals
  • Chemical Engineering
  • Electronic structure and strongly correlated systems
  • salinity
  • temperature
  • Springer  (3)
  • 1990-1994  (3)
  • Geography  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of climatic change through harmonic analysis (1994)
    Springer
    Natural hazards 9 (1994), S. 5-16 
    Details
    ISSN: 1573-0840
    Keywords: Fourier transform ; maximum entropy spectral analysis ; precipitation ; temperature ; climatic change
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract In the present work, a precipitation and temperature series from Barcelona (Spain) are analysed in order to detect the possible existence of climatic changes or cycles. The analysis is carried out both from the temporal and spectral standpoints. The techniques used range from the classical periodogram and Blackman-Tukey method through to the Maximum Entropy method. The results do not show the existence of climatic cycles, though they do show a clear tendency toward increased precipitation and decreased temperature, since the last years of series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662588
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Definition and measurement of salinity in salt lakes (1994)
    Springer
    International journal of salt lake research 3 (1994), S. 53-63 
    Details
    ISSN: 1573-8590
    Keywords: salinity ; athalassic ; salt lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geography
    Notes: Abstract Salinity is the most important chemical attribute of athalassic salt lakes. Even so, some confusion persists of what ‘salinity’ means and how to measure it. For sal lakes, salinity is best defined as the sum total of all ion concentrations, or total ion concentration. Ideally, it is recommended that salinities be expressed on a mass per mass basis and as ppt (parts per thousand). Direct measurements of salinity can only be derived from full ionic analyses. Indirect measurements can be derived by determinations of density, conductivity, freezing point depression and total dissolved solids or matter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990642
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  • 3
    Electronic Resource
    Electronic Resource
    Simulation of water allocation and salt movement in the root zone (1991)
    Springer
    Water resources management 5 (1991), S. 121-147 
    Details
    ISSN: 1573-1650
    Keywords: Irrigation ; agriculture ; soil moisture ; salinity ; crop yield models ; mathematical modelling ; water use in agriculture ; simulation model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Abstract This paper is concerned with the simulation of the water allocation and salt movement in the root zone of a particular crop. A mathematical model of four ordinary differential equations is developed. The model performs water balance and salt balance in unsaturated and saturated regions of the root zone. It is a lumped input and lumped parameter conceptual model, which considers the average soil moisture and salt concentration in the root zone. The equations are solved numerically over the time period of the growing season. Precipitation and irrigation water are treated as inputs. The analyzed results indicate that, for the shallow water table case, the water table elevation has an important effect on the soil moisture depletion dynamics of the unsaturated zone. An appreciable amount of water from the saturated zone is transferred through capillary rise to the unsaturated zone particularly in the case of sandy loam soils. It was found that the water table elevation varies significantly during the growing season. The salt movement simulation indicates a salt concentration build up in the unsaturated zone during the growing season. Contours of equal crop yield reduction as a function of the unsaturated zone initial salt concentration and the irrigation water salt concentration are obtained. The model was tested with data from the Mashtul Pilot Area in Egypt and its performance was satisfactory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422544
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