| Title |
Effect of Installing a Selective Withdrawal Structure for the Control of Turbid Water in Soyang Reservoir |
| Authors |
박형석 ( Hyung Seok Park ) ; 정세웅 ( Se Woong Chung ) ; 윤성완 ( Sung Wan Yoon ) ; 류인구 ( In Gu Ryu ) |
| Keywords |
CE-QUAL-W2; Reservoir operation; Selective withdrawal structure; Soyang Reservoir; Turbidity flow |
| Abstract |
One of the most important water management issues of Soyang Reservoir, located in North Han River in Korea, is a long term discharge of turbid water to downstream during flood season. Installation of a selective withdrawal structure (SWS) is planned by the reservoir management institute as a control measure of outflow water quality and associated negative impacts on downstream water use and ecosystem. The objective of the study was to explore the effectiveness of the SWS on the control of outflow turbidity under two different hydrological years; one for normal flood year and another for extreme flood year. A two-dimensional (2D), laterally averaged hydrodynamic and water quality model (CE-QUAL-W2) was set up and calibrated for the reservoir and used to evaluate the performance of the proposed SWS. The results revealed that the SWS can be an effective method when the θ value, the ratio between the amount of turbid water that containing suspended sediment (SS) greater than 25 mg/L and the total storage of the reservoir, is 0.59 during the normal flood year. However, the effectiveness of the SWS could be marginal or negative in the extreme flood year when θ was 0.83. The results imply that the SWS is an effective alternative for the control of turbid water for moderate flood events, but not a sufficient measure for large flood events that are expected to happen more often in the future because of climate change. |