| Title |
Study of the Mitigation of Algae in Lake Uiam according to the Operation of the Chuncheon Dam and the Soyang Dam |
| Authors |
이동열(Lee, Dong Yeol) ; 백경오(Baek, Kyong Oh) |
| DOI |
https://doi.org/10.12652/Ksce.2022.42.2.0171 |
| Keywords |
의암호; 조류 저감; EFDC; 펄스 방류; 클로로필-a Uiam lake; Algae mitigation; EFDC; Pulse discharge; Chlorophyll-a |
| Abstract |
In this study, the characteristics of algae mitigation according to dam operation were quantitatively analyzed for Uiam Lake, where the Chuncheon Dam is located upstream of the main stream, Uiam Dam is located downstream, and Soyang Dam is located in the tributary stream. Nine dam operation scenarios were applied to the event of the summer of 2018 (at that time an algae alert occurred) using the EFDC model, which is capable of calculating three-dimensional hydrodynamics and water quality levels such as those associated with chlorophyll-a. The dam operation scenarios were set to generate a flushing effect via discharges in the form of pulse waves from the upstream dams and by lowering the water level at the downstream dam. At Uiam Lake, the flushing effect was different depending on the operation of the dam, and the amount of algae reduction at each point was different owing to topographic characteristics and the different base water temperatures from BukHan River and Soyang River. With regard to a point located on the left bank, it was predicted that the peak level of chlorophyll-a would be reduced by approximately 50 % or more upon pulsed discharge at 50 m3/s for three days at Soyang Dam. However, for the right bank, the amount of discharge from Soyang Dam had little effect on
algae mitigation. Therefore, an appropriate dam operation could be effective for algae mitigation at specific points in the water body where large dams exist upstream and downstream, such as at Uiam Lake, in an emergency situation in which algal blooms rapidly. |