水库运行方式改变对水温的影响

Influence of Water Temperature with Different Operation Mode of Reservoir

水库出入库流量、运行水位及取水口位置变化所引起的水库运行方式的改变,会对库体内部水温分布及下游河道水温产生一定的影响。本文以新疆某水库为例,运用三维水温模型进行模拟计算。结果表明:维持水库低水位运行或在外界气温、来水水温都较高的汛期实现表孔泄水,均能显著提高下泄水温,且对库体内部水温分布影响较小;不同典型年条件下,水库出入库水量存在差异,丰水年时水温结构所受影响最大,下泄水温的不同主要体现在汛期,最大水温温差出现在8月份。

With the change of the operation modes of reservoir causing by the different volume of flow, water levels and location of the outlets,the water temperature distribution in the reservoir and the discharged water temperature are all being affected. Taking a reservoir in Xinjiang as an example,the paper used three dimensional model to simulate. The result shows that keep the reservoir on a low water level or increasing a part of discharged water from the surface outlets in the flood season in the higher air temperature and the influx water temperature can significantly improve the discharged water temperature have a slight impact on water temperature distribution in the reservoir. There are different inflows and discharges in different typical year,in the flood year,there will be a big influence on the water temperature in the reservoir,the difference of the discharged water temperature is main showed in the flood season, while the biggest difference occurs in the August.