清流河流域场次洪水的退水特征及过程模拟

分析场次洪水的退水过程对水利工程的运行调度及水文预报方案的制定具有实际的应用价值。根据清流河流域102场暴雨洪水资料,系统分析了流域的退水过程特征,并采用指数型退水模型对退水过程进行了模拟。结果表明:清流河流域退水流量大小与场次暴雨洪水历时、洪峰大小等因素有关,起退流量介于12~303 m3/s;不同场次的退水系数介于0.01~0.0435之间,长历时暴雨洪水的退水系数相对较小;指数型退水模型能够较好地模拟退水过程。

Recession characteristics and process simulation of storm flood in Qingliu River

It is of significance to analyze recession process of storm flood for the operation and regulation of hydraulic engineering and the formulation of hydrological forecast scheme.Based on hourly recorded data of 102 storm floods of Qingliu River, the paper analyzed the characteristics of flow recession of storm floods,and then simulated recession process by using the exponential formula.Results show that the size of the flow are associated with duration, peak discharge of storm floods.The starting recession discharge is between 12m³/s and 303m³/s.While the recession coefficients vary from 0.01 to 0.0435.Recession coefficients of storm floods with long duration usually tend to be smaller than that of flash storm floods. The exponential recession can better simulate recession process.