Simulation of Water Temperature in the Downstream According to Withdrawal Types of Dam using EFDC Model

Abstract In this study, we simulated water temperature in the downstream according to withdrawaltypes of dam using EFDC model. Three scenarios were assumed as water was released fromthe surface layer, the middle layer, and the bottom layer at intervals of 10m depth. In case of thesurface layer withdrawal, the water temperature rose from March and lowered gradually afterit reached a peak in August. The middle and the bottom layers effluence temperatures werelower than the surface layer temperature by maximum 15.9(in July), but after September,temperature inversion appeared. It was advantageous for the surface layer withdrawal todecrease cold damage and fog in downstream area and was possible to the middle and thebottom layers withdrawal from August to September. However, the reliability of model shouldbe improved by accumulating the real-time information of water temperature.Keywords : Cold Damage, EFDC, Selective Withdrawal, Water Temperature Corresponding Author: Park, Jaechung, Miryang Regional Office, K-water, Gyeongnam, 627-812, Korea Tel: 82-55-359-3241 Fax:82-55-359-3245 E-mail: jaechung@kwater.or.kr