中文摘要：

本文考虑高拱坝水库淤沙的影响,采用热流耦合方法对水库立面二维水温数学模型进行数值分析,探讨高拱坝水库水温的分布规律。在此基础之上,分析了水库水温分层的形成过程及原因,并重点探讨了淤沙对高拱坝水库水温以及运行期应力的影响,对比分析了水温的规范算法、实测值和本文数值计算方法之间的差别,并对规范的水库水温计算方法进行了评价。二滩水库的数值计算结果表明,在1 060m高程以下,考虑淤沙的影响更接近实测的水温结果,而按照规范方法计算的水库水温边界条件,具有较大的安全裕度。

英文摘要：

A 2-D flow-thermal coupling numerical model is established to study the effect of sedimentation on water temperature distribution in reservoir of high dam.The temperature distribution law,the formation and development of temperature layers are analyzed.The influence on the stress field of the high arch dam caused by the sedimentation during reservoir operation period is discussed.The differences of the results among the methods of design criterion,the actual measurement and the numerical calculation of the preposed model are compared.On this basis,the accuracy of the design criterion method for calculating temperature of reservoir water is evaluated according to these compared results.The numerical simulation results of the Ertan Reservoir show that,if the impact of sedimentation is being considered,the value of calculated temperature is very close to the observated data.There exists a larger margin of safety for boundary conditions of the reservoir water temperature according to the design specification.