基于径流系数的城市降雨径流模型参数校准方法

为了解决我国城市降雨径流模型参数校准数据欠缺的问题,应用较易获得的径流系数作为校准目标,以峰现时间作为径流系数模拟值的计算依据,以合成单峰降雨作为校准降雨事件,在SWMM平台上进行模型参数校准.通过校准模型适用性和灵敏度分析,表明该法既可以满足模型参数预校准的要求,也可以在模型参数不确定性分析的基础上用于实践.因此,该法是改善城市降雨径流模型参数校准状况的有效途径.

Parameter calibration method for urban rainfall-runoff model based on runoff coefficient

In order to deal with the calibration data scarcity problem in China, the parameter calibration of urban rainfall-runoff model is conducted based on SWMM, which uses the easy-access runoff coefficient as parameter calibration target, time of runoff peak as the basis of runoff coefficient simulation, and the synthesized single-peak rainfall events as the calibrated rainfall scenarios. According to the applicability and sensitivity analysis for the calibrated model, it shows that the method can meet the demand for model parameter pre-calibration and for practices on the basis of model parameter uncertainty analysis. Therefore, it is an effective approach to improve the parameter calibration condition for urban rainfall-runoff model.