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Résumé :
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The task group completed a critical evaluation of the current state of the practice in water quality modelling. A major limitation in present model formulations is the continued reliance on BOD as the primary state variable, despite the fact that BOD does not include all biodegradable matter. A related difficulty is the poor representation of benthic flux terms. As a result of these shortcomings, it is impossible to close mass balances completely in most existing models. These various limitations in current river quality models impair their predictive ability in situations of marked changes in a river's polluant load, streamflow, morphometry, or other basic characteristics.
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