取水口高程对过渡型水库水温分布结构的影响

采用宽度平均的立面二维水温模型，研究了3种不同取水口高程情况下水库水温分布结构和水库下泄水温的变化规律。得出在3月至8月水库下泄水温随着取水口高程的降低而降低，在9月至翌年2月水库下泄水温随着取水口高程的降低而升高的变化规律。研究结果表明水库分层取水可在一定程度上减小水库下泄水温与坝址天然水温的差值，从而减轻水库下泄低温水对下游水生生态环境的不利影响。

ON THE INFLUENCE OF INTAKE LOCATION ON TEMPERATURE DISTRIBUTION STRUCTURE OF RESERVOIR WITH SEASONAL TEMPERATURE STRATIFICATION

To study the influence of low-temperature water of hydropower project's effluent on water temperature distribution and aquatic ecosystem in the downstream of a dam,the water temperature distribution in the reservoir and the effluent water temperature at three different intake locations were predicted(using) laterally averaged two-dimensional model in this paper.It is shown that the effluent water temperature from March to August decreased with the decrease of intake elevation,while from September to February in the following year increased with the decrease of intake elevation.It can be concluded that to a certain extent,layered intake can reduce the difference of water temperature between effluent and natural water,and mitigate the adverse effects of lower temperature effluent on aquatic ecosystem in the downstream of a dam.This study can provide a theoretical base for the assessment of environmental impact of water hydropower projects.