基于EFDC的西南地区某水库水温结构模拟研究

为预测西南地区某水库的水温分布规律,本文以EFDC模型为基础,参考二滩水库、三峡水库和阿海水库等算例的模型参数取值,建立了该水库二维水温模型,对该水库典型平水年水温分布进行预测,分析了该水库水温分层及下泄水温的变化规律。模拟结果表明:(1)典型平水年夏季该水库会出现水温垂向分层现象,其中6月份垂向温差最大达到10℃;(2)水库表层水体温度呈现出季节性的变化规律,日间变化也十分明显,底层水体温度比较稳定,仅随季节更替稍有变化;(3)水库取水口底板高程620 m时,下泄水温与天然水温比较,下降幅度小于0.5℃。

EFDC-based simulation on water temperature structure of a reservoir in Southwest China

In order to predict the water temperature distribution law of a reservoir in the Southwest China，the 2-D water temperature model for the reservoir is established herein under the references of model parameters taken for the cases of Ertan Reservoir，Sanxia Reservoir and Ahai Reservoir on the basis of EFDC model，and then the changing laws of the temperature stratification and the discharge water temperature of the reservoir are analyzed. The simulation result shows that：（1） the vertical stratification of the water temperature is to occur during the summer in a typical normal flow year； in which the maximum vertical temperature difference can be up to 10 ℃ in June；（2） the temperature of the surface water of the reservoir presents a seasonal change with a significant change in the daytime，while the temperature of the bottom water is more stable and only slightly changed along with the seasons；（3） when the elevation of the bottom slab of the reservoir water intake is higher than 620 m，the drop amplitude ofthe temperature of the discharged water from the reservoir is less than 0.5 ℃，if compared with the natural one.