基于MIKE平台的水电工程对水温影响预测评价

准确模拟和预测水库及下游河道的水温分布规律对降低水电工程环境影响起着重要作用。基于MIKE系列软件，采用一维水温模型对怒江中下游天然河道水温进行数值模拟计算，并在对怒江规划龙头马吉水库的水温类型进行判别的基础上，运用库区立面二维水温模型对库区及下泄水温变化进行预测。计算结果表明，马吉水库为典型温度分层型水库，来水量越大，表层水温越低，底层水温越高。水库建成后，下泄水温过程与天然河道水温过程差异加大。上述研究可为在水电工程运行中采取措施应对水温变化提供技术支撑。

Prediction and evaluation of influence of hydropower projects on water temperature based on MIKE software

The precise simulation and prediction to water temperature distribution in reservoir and lower reaches have significant meanings to reducing the adverse impacts from hydropower projects to environment.Based on MIKE software,the natural river water temperature of middle-lower reaches of Nujiang River is simulated by 1D water temperature model.We firstly classify the water temperature type of Maji Reservoir,a planed leading reservoir on Nujiang River,and apply reservoir elevation 2D water temperature model to predict the temperature variation in reservoir and downstream.The results show that the Maji Reservoir is a typical temperature stratification reservoir,the larger of incoming flow,the lower temperature at surface water and higher at bottom water body.After impoundment of the reservoir,the temperature difference between discharge water and natural river water will enlarge.The above laws could help with adopting countermeasures to cope with the temperature variation.