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  • 1
    Electronic Resource
    Electronic Resource
    Development of a Liming Prediction Model for Llyn Brianne (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 13 (1999), S. 0 
    Details
    ISSN: 1747-6593
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: This paper describes a model which was developed to simulate the effect of automated liming on the quality of a Welsh lake (Llyn Brianne) and its outflow river. The objective was to model the amount of lime required to dose the input streams under a variety of conditions. It was concluded that it would be feasible to install automatic-dosing equipment on the two input streams to deliver sufficient lime to ensure that the pH of the lake and water downstream was controlled at a pH value of 6.0 or greater, thus stabilizing water quality for fish and other aquatic biota.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1747-6593.1999.tb01047.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Preliminary empirical models of the historical and future impact of acidification on the ecology of Welsh streams (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 20 (1988), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. We describe a preliminary approacb to modelling the impact of acidification on the ecology of two Welsb streams. Output from the hydrochemical Model of Acidification of Groundwaters in Catchments (MAGIC) was used to drive empirical models which predicted brown trout Salmo trulta (L.) survival, trout density and invertebrate assemblage type. The models were used for hindcasts between 1844 and 1984 under conifer forest and moorland conditions. Forecasts involved each of these land uses with sulphate deposition either continued at 1984 levels or reduced by 50%.2. Trout survival times and trout densities in the models declined markedly between 1844 and 1984. The most severe decline occurred under simulated forest, where high aluminium concentration led to the virtual elimination of trout in both streams.3. In forecasts, only in simulated moorland with sulphate deposition reduced by 50% of 1984 levels, was further decline in trout population retarded. There was no marked recovery in trout density under any of the conditions examined.4. Invertebrate assemblages in streams during the nineteenth century may have differed from those now existing in nearby moorland streams which are presently circumneutral. Past chemical conditions were unusual (〈3mg 1−1 total hardness, but pH 〉5.7 and low aluminium) by present-day standards, and were outside the range of the invertebrate model until -1940.5. Between the 1940s and 1984 there was no change in invertebrate fauna under the moorland scenario despite some acidification. However, simulated forest advanced the appearance of the most impoverished assemblage type, which did not recover in spite of reduced deposition.6. We discuss several uncertainties with the models in their present form, but suggest some methods for their testing and validation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1988.tb01724.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Distant vision (1991)
    [s.l.] : Nature Publishing Group
    Nature 351 (1991), S. 708-708 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] REMOTE sensing is often seen as being pri-marily a series of techniques looking for a problem to solve. The high-tech nature of the business, the endless acronyms and unintel-ligible technical jargon have created a sub-world (or superworld) of specialists who can speak eloquently to each other but ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/351708b0
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  • 4
    Electronic Resource
    Electronic Resource
    Modelling algal growth and transport in rivers: a comparison of time series analysis, dynamic mass balance and neural network techniques (1997)
    Springer
    Hydrobiologia 349 (1997), S. 39-46 
    Details
    ISSN: 1573-5117
    Keywords: River Thames ; artificial neuralnetwork ; models ; modelling techniques ; generalised sensitivity analysis ; water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Algae present considerable problems for river qualitymanagers and water suppliers and methods to predicttheir behaviour, growth and transport can assist inoperational management. Alternative techniques existfor predicting algal response and three approacheshave been compared and applied to data from six sitesalong the River Thames. These techniques include timeseries analysis, dynamic mass balance and growthequations and neural network approaches. It is shownthat neural network techniques offer a new approachrequiring less intuitive knowledge but predictivecapability is not improved greatly compared to otherapproaches. Neural networks enable models to bedeveloped along all six reaches of the RiverThames.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003089310834
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  • 5
    Electronic Resource
    Electronic Resource
    A modeling study of long-term acidification in an upland Scottish catchment (1988)
    Springer
    Water, air & soil pollution 40 (1988), S. 275-291 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A modeling study of the Allt a Mharcaidh catchment in the Cairngorm region of Scotland has been undertaken to investigate long term trends in acidification and model sensitivity to soil physical and chemical characteristics. The MAGIC model (Model of Acidification of Groundwater In Catchments) is used to demonstrate that the sulphate adsorption ability of the soil and quality and quantity of rainfall inputs have significant effects on model output. Optimal weathering rates and predicted present day ion concentrations in streamwater compare well with measured and observed values. The analysis shows that the catchment has become progressively acidified since pre-industrial times but major changes in stream acidity have yet to occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163733
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    Paper (German National Licenses)
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