洪峰衰减与预报

Flood Peak Attenuation and Forecast

通过求解Ｓｔ．Ｖｅｎａｎｔ方程组在洪峰处的二次近似解，获得了河道洪水传播过程中洪峰水深与洪峰流量的近似衰减规律，据此即可快速地预报河道下游断面的洪峰水位及洪峰流量．文末还以柘溪水库坝址下游的江南～夫溪河段作为实例．对出流站的洪峰进行了预报，其精度令人满意．

The attenuation laws for find pcak depth and discharge during flood propagation arcderived from secondary approximate solution of the St.Venant equations corresponding to the floodpeak.These laws can be utilized to quickly forecast the fital peak stage and discharge at thedownstream section of a river.As an example,the forecast is made for the flood peak of the outflowstation in the Jiangnan～Fuxi river Teach downstream of dam site of the Zhexi Reservoir.Its accuracyis satisfactory.