向家坝水电站切机非恒定流对下游通航的影响  

Influence of unsteady flow during unit cut-off at Xiangjiaba Hydropower Station on downstream navigation

作　　者：张湛[1] 黄成林 刘亚辉[1] 张绪进[1] ZHANG Zhan;HUANG Chenglin;LIU Yahui;ZHANG Xujin(Southwest Research Institute for Hydraulic and Water Transport Engineering of ChongqingJiaotong University,Chongqing 400016,China;Chongqing Xike Water Transport Engineering Consulting Co.,Ltd.,Chongqing 400016,China)

机构地区：[1]重庆交通大学西南水利水运工程科学研究院,重庆400016 [2]重庆西科水运工程咨询有限公司,重庆400016

出　　处：《水运工程》2024年第9期93-98,104,共7页Port & Waterway Engineering

摘　　要：为分析电站机组突发甩负荷切机运行时,非恒定流对下游通航的影响,以向家坝水电站为研究对象,建立1:100正态物理模型,模拟向家坝水电站机组切机工况,分析8台机组不同切机数量下非恒定流引起的下游河段水位、流速的变化特性,并结合自航船模试验,研究对船舶安全航行的影响。结果表明:电站机组分别切机1~8台时,在采取快速补水情况下,下游水位最大时变幅0.89 m∕h,未超过电站运行调度规程允许值。非恒定流引起的水位变化主要位于桐梓林以上河段,流速变化主要位于和尚岩以上河段,水流条件满足船舶航行要求。研究成果可为电站调度运行、下游航道维护及船舶航行提供技术支持。To analyze the impact of unsteady flow on downstream navigation during sudden load shedding and turbine cutting operation of power plant units,this paper takes Xiangjiaba hydropower station as the research object,Establishes a 1:100 normal physical model,simulates the turbine cutting conditions of Xiangjiaba hydropower station units,analyzes the changes in water level and flow velocity in the downstream reach caused by unsteady flow under different turbine cutting numbers of 8 units.At the same time,combines with self-propelled ship model tests to study the impact on safe navigation of ships.The results show that when the power plant units cut off 1-8 units respectively,under the condition of rapid water replenishment,the maximum hourly variation of downstream water level is 0.89 m h,which does not exceed the allowable value in the power plant operation and scheduling regulations.The water level changes caused by unsteady flow mainly occur in the river section above Tongzilin,while the flow velocity changes mainly occur in the river section above Heshangyan.The flow conditions meet the requirements of ship navigation.The research results can provide technical support for the dispatch and operation of power plants,downstream channel maintenance,and ship navigation.

关 键 词：切机 非恒定流 物理模型 通航条件 向家坝 

分 类 号：TV135.4[水利工程—水力学及河流动力学] U612[交通运输工程—船舶及航道工程]