Modeling Low Flow Transport of Nonconservative Pollutants in Streams

by Il Won Seo, Seoul Nat Univ, Seoul, Republic of Korea,
Dae Young Yu, Seoul Nat Univ, Seoul, Republic of Korea,

Abstract: The complex nature of low flow transport and transformation of nonconservative pollutants in natural streams has been investigated using a numerical solution of a proposed mathematical model that is based on a set of mass balance equations describing the advection, dispersion, decay and mass exchange mechanisms in streams and in storage zones. In the present study, a mathematical model (named storage-transformation model) has been developed to predict adequately the non-Fickian nature of mixing and transformation mechanisms for decaying substances in natural streams under low flow conditions. Comparisons between the concentration-time curves predicted using the proposed model and the measured stream data shows that the Storage -Transformation Model yields better agreements in the general shape, peak concentration and time to peak than the I-D dispersion model. The proposed model shows significant improvement over the conventional I-D dispersion model in predicting natural mixing and storage processes in streams through pools and riffles.

Subject Headings: Mathematical models | Water pollution | Water storage | Low flow | Data processing | Sediment transport | Pollutants | Mathematics

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