基于日调节非恒定流影响的长江叙渝段最不利通航水位数值模拟  

Numerical Simulation of the Most Adverse Navigable Condition from Shuifu to Chongqing in Yangtze River under Influence of Daily Regulation of Unsteady Flow

作　　者：黄小利[1] 郭志学[1] 陈日东[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《水电能源科学》2016年第12期78-82,共5页Water Resources and Power

摘　　要：长江上游金沙江、岷江上梯级电站的日调节作用对其下游河道水流运动产生影响,两江水流在宜宾交汇、叠加,两股非恒定水流的耦合使下游河道水流运动规律变得更为复杂。为确定长江干流叙渝段在上游干、支流梯级水库日调节影响作用下的最不利通航的水流条件,建立了兼顾计算精度、效率、稳定性的二维非恒定流数学模型,在确定岷江、金沙江非恒定流代表工况的基础上,数值模拟了下游河道水流参数变化规律。结果表明,洪水传播过程中存在明显的坦化现象,沿程李庄、泸州、朱沱测站水位变幅渐次降低,水流非恒定参数也呈沿程减小的趋势,下游河道水流的非恒定性主要受基流及流量变幅都较大的金沙江向家坝日调节过程影响;进而确定了金沙江、岷江最不利来流条件组合工况。The daily regulation of cascade hydropower stations in Minjiang and Jinshajiang river has a great influence on the downstream streamflow.Besides,the superposition and coupling of the unsteady flow in Yibin make the flow structure more complicated.To determine the most unfavorable navigation condition from Shuifu to Chongqing,two-dimensional unsteady flow mathematical model is set up considering calculation accuracy,efficiency and stability.On the basis of the Minjiang and Jinshajiang river＇s flow condition,the river flow parameters are numerically simulated.Results show that the flood has obvious attenuation phenomenon in propagation process.The water level and unsteady flow parameter are gradually reduced along the Lizhuang,Luzhou and Zhutuo station.The inconstancy of the downstream river flow is mainly influenced by the daily regulation process of Jinshajiang and Xiangjiaba which base flow and flow rate range are larger.Therefore,it obtains the most adverse flow combination condition of Minjiang and Jinshajiang river.

关 键 词：非恒定流 水流叠加 二维数学模型 不利来流条件 非恒定参数 通航水位设计 

分 类 号：TV131.61[水利工程—水力学及河流动力学]