| Abstract |
| Yeongsan River basin turned into a relatively safe basin from flooding by heightening of agricultural reservoir dams, construction/expansion of washlands, Detention reservoirs and estuary barriers through the Four Major River Project. However, the Yeongsan River still shows the worst water quality in Korea. The river has two detention reservoirs in operation. It is possible to improve the water quality of the river if the reservoirs can retain water during non-flooding seasons and utilize the water as dilution water. Therefore, the present study selected the Environmental Fluid Dynamics Code (EFDC) and built a model to analyze the effect of water quality improvement in the reach with the length of 98 km from the Geumwol bridge located upstream to the immediate upstream of the Juksan weir located downstream in the river. 27 scenarios were created according to freshwater storage rate and discharge volume of the detention reservoirs. The effects of water quality improvement were analyzed using TOC and TP in the Naju station that is the representative one in the Yeongsan River. The results reveal that the effects of water quality improvement are 2.0 - 16.8 % and 10.1 - 22.8 % for TOC and TP, respectively, and last 0.43 - 6.94 days. The present study proposes implementing projects to improve the water quality in the river after establishing an optimized utilization plan for the detention reservoirs based on verification of the effects through a pilot run. |
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| Key Words |
| Detention Reservoir, EFDC model, Water quality Improvement, Yeongsan River, 홍수조절지, EFDC모델, 수질개선, 영산강 |
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