金沙江典型水库水温影响因素敏感性分析

在拱坝温度应力计算等领域,库水温是重要的边界条件,对其计算精度要求较高,尤其对于高拱坝上游库水温而言,需要进行详细研究。库水温的影响因素较多,如河道的类型、水库的来水流量、来水温度、气象条件等,如何合理考虑各项因素对库水温分布的影响,对于计算的精确度意义重大。利用横向平均的二维水动力模型来研究金沙江上向家坝、溪洛渡、白鹤滩、乌东德等4座水动力特征相似水库的水温时空动态分布,并以典型水库溪洛渡为例,对该水库的来水流量、来水温度和气象条件等因素进行敏感性分析。研究成果可为后续几座水库的水温计算分析提供参考。

Sensitivity analysis of influential factors for water temperature of typical reservoirs in Jinsha River

In the calculation of thermal stress of arch dams, the reservoir water temperature is an important boundary condition, and high calculation accuracy is required, especially for the upstream water temperature of high arch dams.There are many influential factors for reservoir water temperature, such as the channel type, the reservoir inflow, the inflow temperature, weather conditions, etc.and how to consider the impact of various factors on the distribution of water temperature is significant for calculation accuracy.In this paper,a two-dimensional lateral averaged hydrodynamic model was used to simulate the dynamic temporal and spatial distribution of water temperature in large reservoirs that have similar hydrodynamic characteristics on Jinsha River, such as Xiangjiaba, Xiluodu, Baihetan and Wudongde.Taking Xiluodu Reservoir as the case, sensitivity analyses of the inflow, the inflow temperature and weather conditions were carried out, which can provide important reference for the reservoir temperature calculation in the following projects.