Abstract
Results obtained by a previously published cross-correlation identification technique applied to the modified Streeter-Phelps river model suggest that the oxygen exchange rate, the oxygen invasion rate, an apparent photosynthesis rate and the respiration rate can be identified using oxygen measurements from a single point of observation. This hypothesis is examined here using the alternative method of differential approximation and the gradient method. It is found that the simple solely time dependent model is inadequate for the description of the dissolved oxygen concentration in a river and that consequently its parameters can not be identified using the measurements from a single point only.
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