水库调度对溪洛渡电站下游水温的影响

Impact of Reservoir Operation on the Water Temperature Downstream of Xiluodu Power Station

溪洛渡电站运行后将在春季下泄低温水，影响下游鱼类繁殖。研究通过改变水库调度方式来减免下泄低温水的影响。设计了3种水库调度方式，并采用立面二维κ-ε温度模型预测溪洛渡电站库区水温及下泄水温。结果显示在1～6月升温期加大泄流量，降低库水位，会导致库区表层水温升高，斜温层下移，使引水口得到更多的表层温水，从而提高下游河道的水温。水库调度能一定程度上降低电站下泄低温水对鱼类产卵的影响。

Xiluodu power station will discharge cold water to downstream in spring after operation and influence the fish breeding at downstream. Modification of the reservoir operation curve is studied to reduce this impact. Three kinds of operation curves are supposed. 2 - D laterally-averaged κ-ε temperature model is adopted to study the water temperature structure in reservoir and the outflow temperature. The result shows during the temperature lifting time from January to June, the increase of the flow discharge will accelerate the decrease of the water level, which will raise the water temperature on the surface and cause the thermocline moving down to the bed. Then more warm water will be led from the surface to the outlet, and the downstream water temperature will rise. The reservoir operation could reduce and avoid the impact of cold water on fish breeding to some degree.