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  • water temperature  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The prediction of water temperatures in chalk streams from air temperatures (1991)
    Springer
    Hydrobiologia 210 (1991), S. 183-189 
    Details
    ISSN: 1573-5117
    Keywords: water temperature ; rivers ; regression ; climate change
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The water temperatures of four English chalk streams which have a large groundwater component in their discharge were studied. Simple linear regression models were used to described mean monthly water temperature as a function of mean monthly air temperature. There were no significant between-year differences within rivers, in the case of the Lambourn, Winterbourne and Tadnoll. For the Frome, only one year out of the eight studied was significantly different from the others. Further analysis revealed that there were no significant differences between the Tadnoll, Winterbourne and Lambourn, and that the relationship between maximum monthly water temperature and air temperature was best described by the equation y = 4.29 + 0.55x. Using this pooled equation to predict river temperatures for the three rivers studied gave mean deviations of less than 1 °C from the observed temperatures. It was concluded that linear regressions of the type presented are sufficiently accurate to predict the thermal regimes of rivers for a variety of limnological purposes. They can also be used to predict the temperature response of chalk streams to increased air temperatures that may be produced by climate change. The results predict that chalk streams would show less increase in temperature than other running waters under these circumstances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034676
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The chalk-stream environment (1992)
    Springer
    Hydrobiologia 248 (1992), S. 3-9 
    Details
    ISSN: 1573-5117
    Keywords: chalk stream ; chalk hydrology ; stream flow ; water temperature ; water chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chalk is a very pure and porous form of limestone. Water percolates down through the rock to form aquifers which overflow as springs forming chalk streams which receive little surface runoff. Passage through the rock is relatively slow and smooths out irregularities in rainfall and stabilises the water temperature. As a result the streams tend to have a regular annual hydrograph with a relatively small difference between winter and summer flows and with no spate conditions; and the temperature range in the streams remains closer to the annual mean than in rivers receiving more surface runoff. The water is calcareous with a pH of 7.4–8.0 and an ample supply of plant nutrients. The streams support diverse and productive communities of plants and animals and the restricted temperature range is particularly suitable for the growth of brown trout.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008881
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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