基于数值方法的大型水库水温结构影响因素分析  

An Analysis of the Influencing Factors of Water Temperature Structure in Large Reservoir Based on Numerical Method

作　　者：邹琳 刘伟[1] 蒋定国 ZOU Lin;LIU Wei;JIANG Ding-guo(College of Hydraulic and Environmental Engineering,Three Gorges University,Yichang 443002,Hubei Province,China;Three Gorges Corporation,Beijing 100038,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]中国长江三峡集团有限公司,北京100038

出　　处：《中国农村水利水电》2022年第9期113-119,共7页China Rural Water and Hydropower

基　　金：国家自然科学基金重点项目-长江水科学研究联合基金项目(U2040220);国家自然科学基金项目(51709153)。

摘　　要：水库水温是大型水利水电工程建设和运行过程中关注的重要指标,其影响因素众多且共同作用、相互耦合,基于实际监测资料结果分析无法较好区分各因素影响程度和范围。构建简化的模型水库作为研究对象,采用数值方法分析入流流量、入流水温和气温对水库水温结构的影响。结果表明:在入流条件变化时,入流流量主要影响区域在取水口底板高程以上;入流水温周期性变化条件下,随着周期增加,影响的水深范围增大,最大影响水深在取水口底板高程附近;气温周期性变化条件下,随着周期增加,影响的水深范围增大,当气温变化周期分别为7、30、90 d时,影响水深约为20、25 m和整个水库水深;对β法改进,仅考虑取水口底板高程以上水库库容进行计算,可更为准确地判断坝前水温结构的变化。During the construction and operation of large-scale water conservancy and hydropower projects,the water temperature of the reservoir is an important indicator of concern.The influencing factors are numerous and interact with each other.The analysis based on actual monitoring data is time-consuming and labor-intensive,and the influencing degree and scope of each factor cannot be well distinguished.A simplified model reservoir is built as the research object,and the effects of inflow flow,inflow water temperature and air temperature on reservoir water temperature structure are analyzed by numerical method.The results show that when the inflow conditions change,the inflow flow mainly affects the area above the intake floor height.Under the condition of periodic change of inlet water temperature,the range of affected water depth increases with the increase in the period,and the maximum affected water depth is near the elevation of the intake.Under the condition of periodic temperature change,the affected water depth range increases with the increase in the period.When the temperature change period is 7,30 and 90 d,the affected water depth is about 20 m,25 m and the water depth of the whole reservoir.The modification ofβ method,which only considers the reservoir capacity above the floor height of water intake,can judge the change of water temperature structure in front of the dam more accurately.

关 键 词：水温结构 影响因素 数值方法 大型水库 边界条件 

分 类 号：TV697[水利工程—水利水电工程]