상하수도학회지 (Journal of Korean Society of Water and Wastewater)
- 제7권1호
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- Pages.29-36
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- 1993
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- 1225-7672(pISSN)
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- 2287-822X(eISSN)
갈수기(渴水期) 하천(河川)에서의 오염물질(汚染物質)의 확산(擴散) 및 이동(移動)
Low Flow Pollutant Transport in Natural Rivers
초록
The complex nature of low flow mixing in natural channels has been investigated using both laboratory experiments and the numerical solution of a proposed mathematical model that is based on a set of mass balance equations describing the mixing and mass exchange mechanisms. Laboratory experiments, which involved collection of channel geometry, hydraulic, and dye dispersion test data, were conducted in a model of four pool and riffle sequences in a 49-m long tilting flume. The experimental results show that flow over the model pool-riffle sequences is highly non-uniform. Concentration-time curves are significantly skewed with long tails. Comparison between measured and predicted concentration-time curves shows good agreement in the general shape, peak concentration and time to peak. The proposed model shows significant improvement over the conventional one-dimensional dispersion model in predicting natural mixing processes in open channels under low flow conditions through pools and riffles.
키워드