清江水布垭水电站对水温影响回顾评价

Post-evaluation of Influence of Qingjiang Shuibuya Hydropower Station on Water Temperature

水布垭水库属于典型的深水型水库,对水温的影响是水布垭水电站建设的主要环境影响,也是环境影响评价关注的重要内容之一。利用水布垭水电站竣工环境保护验收调查实测资料,对水温影响进行回顾评价,结果表明水布垭水库在春季、夏季和秋季存在水温分层现象,尤其以夏季水库水温分层最为明显,水库呈现出明显的双温跃层结构,夏季垂向温差在11.0~18.8℃,春秋季在7.6~11.1℃,5-9月水库下泄水温比天然河道水温低0.6~4.4℃,水库运行后水温实测结果与环境影响评价报告预测结论基本一致,采用一维垂向水温模型对深水型水库进行水温预测是可行的。

Shuibuya Reservoir is a typical deep-water reservoir,the impact on water temperature is the main environmental impact of Shuibuya hydropower station construction,which is also an important part of the environmental impact assessment.Based on the survey data of environmental protection acceptance check of Shuibuya hydropower station,the influence on water temperature was evaluated retrospectively.The results show that there are water temperature stratification phenomena in spring,summer and autumn,and the summer water temperature stratification is the most obvious in Shuibuya reservoir.The reservoir shows obvious double thermocline structure.The vertical temperature difference in summer is 11.0 ~18.8 ℃,in spring and autumn is 7.6 ~11.1 ℃.The water temperature of reservoir discharge 0.6 ~4.4 ℃ lower than the water temperature of natural river in May to September.After the operation of Shuibuya reservoir,the measured results of water temperature are basically in accordance with the prediction conclusion of the environmental impact assessment report.It is feasible to predict the water temperature of the deep-water reservoir by one-dimensional vertical water temperature model.