上下断面间河段距离选取对水库回水计算的影响  

Impacts of River Reach Distance Selection between Upper and Lower Cross Section on Reservoir Backwater Calculation

作　　者：沙成刚[1,2] 赵廷红 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州73000 [2]青海省水利水电勘测设计研究院,青海西宁810001

出　　处：《水力发电》2013年第5期4-7,共4页Water Power

摘　　要：上下断面间河段距离△L的选取是计算水库、水电站回水和确定淹没线的重要影响因素之一。分别探讨河段间距选取对确定河道比降的影响和对回水长度范围确定的影响。分析表明,在同流量同起推水位不变的情况下,河段间距选取越大,河道平均比降、末端回水尖灭点的极值趋向误差就越大,不能正确反映出河道水面线的真实情况,所以要提高回水水面线的计算精度,就要严格控制好河段间距的选取。The river reach distance between upper and lower sections △L is a main factor that influence the backwater calculation and the determination of submerged line of reservoir. The impacts of AL on the determination of river channel gradient and backwater length are analyzed. The results show that a larger △L can lead to bigger extremum tend errors on the calculation of river average gradient and backwater length when the flow and initial push level are same. For improving the calculation accuracy of backwater surface curve, the selection of △L must be strictly controlled.

关 键 词：回水计算 上下断面间河段距离 水面线 起推水位 回水末端 

分 类 号：P333[天文地球—水文科学]