葛洲坝工程对坝下游河道行洪影响的计算分析

Calculation and analysis of effect of the gezhouba project on flood propagation along river channels below the dam

本文建立了河道洪水一维非恒定流数学模型，进行了坝下游宜昌—监利河段“８１７”洪水复演计算，验证结果较好．应用该数学模型，还进行了该坝下游河段的行洪对比计算，初步论证了葛洲坝工程对坝下游河道行洪水位、洪峰流量、河道槽蓄特性的影响．

After operation of the Gezhouba Project,accumulated degradation river bed lowering and armoring might cause some variations of process and characteristics of flood propagation along river channels below the Dam.A concerned 1 D mathematical model of unsteady river flow is presented in this paper.It has been applied to the calculation of “81 7” flood routing for downstream Yichang Jianli river reaches with fairly satisfied verificaiton.Applying this model,contrast calculations of flood propagation along river channels below the Dam have been undertaken,effects of the Project on flood stage peak discharge and features of flood storage along downstream river channels have been primarily studied.