한국수자원학회:학술대회논문집 (Proceedings of the Korea Water Resources Association Conference)
- 한국수자원학회 1993년도 수공학연구발표회논문집
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- Pages.175-182
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- 1993
Modeling Dynamics of Nonconservative Pollutants in Streams with Pools and Riffles
- Seo, Il-Won (Asst. Prof., Dept. of Civ. Engrg., Seoul Nat. Univ., Gwanak-Ku, Seoul 151-742) ;
- Yu, Dae-Young (Res. Asst., Dept. of Civ. Engrg., Seoul Nat. Univ., Gwanak-Ku, Seoul 151-742)
- 발행 : 1993.07.01
초록
The complex nature of low flow transport and tranformation of nonconservative pollutants in natural streams with pools and riffles has been investigated using a numerical solution of a proposed mathematical model that is based on a set of mass balance equations describing hydrodynamic processes (advection, dispersion, and mass exchange mechanicms in streams and in storage zones) and chemical processes (reaction or decay). In this 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 usingthe proposed model and the measured stream data shows that the Storage-Transformation Model yields better agreements in the goneral shape, peak concentration and time to peak than the 1-D dispersion model. The result of this study also demonstrates the differences between transport in pool-and-riffle streams versus transport in more uniform channels. The proposed model shows significant improvement over the conventional 1-D disperision model in predicting natural mixing and stroage processes in streams through pools and riffles.
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