中文摘要：

水库下泄水温的影响是水电工程环境影响评价的必要组成部分。不同取水方案下,水库的下泄水温过程不同,对下游河道的影响也不同。以下浒山水库为例,将单层取水和分层取水方案下的下泄水温作为边界条件,应用一维河道水量水温耦合模型,预测出不同方案下的下游河道水温,在考虑河道水生态（如溶解氧含量、浮游生物、底栖动物和鱼类等）对温度变化的响应下,分析得到不同取水方案对下游河道水生态的影响。分析结果表明：不同取水方案水温变化对浮游生物和底栖动物没有很明显的影响;单层取水水温影响的鱼类比分层取水的多。

英文摘要：

The impact assessment of low-temperature water for huge reservoirs is an important part in assessment statements.With different intake structures,the water temperature of discharging flow are different,so the impact on river downstream is different too.Taking Xiahu-shan Reservoir for example,this paper puts water temperature of outflow derived from different intake programs,as boundary condition,into dimensional river channel model of water quantity and water temperature,predicting water temperature along with downstream river under different programs.Considering the response of river water ecosystem（such as dissolved oxygen,plankton,benthic animals fish and so on.） to temperature change,the impact of outflow temperature under different intake structures of the reservoir on water ecosystem is analyzed.The results show that the discharged water temperature using different intake structures has no obvious effect on plankton and benthic animals.As for fishes,single-level intake programs affect more fishes than multi-level intake program.