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Effects of Sand Supply and Artificial Floods on Periphyton in the Downstream of a Dam (Yangyang Dam, Korea)  

Park, Misook (Department of Environmental Science, Kangwon National University)
Lee, Jaeyong (Department of Environmental Science, Kangwon National University)
Jung, Sungmin (Department of Environmental Science, Kangwon National University)
Park, Chang-Keun (Department of Civil Engineering, Kwandong University)
Chang, Kun (Yangyang Pumped Storage Power Plant, Korea Hydro and Nuclear Power Co.)
Kim, Bomchul (Department of Environmental Science, Kangwon National University)
Publication Information
Journal of Korean Society on Water Environment / v.28, no.3, 2012 , pp. 418-425 More about this Journal
Abstract
Dam construction in a river can change its hydrological pattern and trap sediments, which results in ecological changes in the downstream. It is a common phenomenon in the downstream of dams to have decreased sediment flow and increased periphyton. Artificial floods and sediment application are suggested as mitigation practices in order to simulate natural process of flood; transporting sediment and sloughing periphyton off. In this study the effects of artificial floods on periphyton were examined by applying sand artificially and discharging water from a dam (Yangyang Dam, Korea). The study area has been suffering from turbidity problems caused by shore erosion of the dam. The accumulation of inorganic sediments and increase of periphyton on the river bottom are the major factors of habitat deterioration in the downstream reaches. Artificial flood and artificial addition of sand was performed in summer and the effects were measured. Piles of applied sands were washed off easily by discharge and it enhanced the periphyton sloughing effect. The removal efficiency of periphyton was 50 ~ 80% within the 2 km reach from the dam. In conclusion artificial floods and sand application can be a good mitigation measure for the habitat rehabilitation after a dam construction in streams.
Keywords
Artificial flood; Removal efficiency of periphyton; Sediment; The Hoo stream; Yangyang Dam;
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