Evaluation method of lumping process of runoff models based on their stochastic response characteristics

本文利用由坡面产流模型和河道网络组成的径流系统，推导出计算流量高阶中心矩的理论微分方程。数值模拟结果验证了推导方程的有效性。结果表明，当流域面积小于100平方公里和几十平方公里时，流域稳定状态下的随机特性是恒定的。研究结果可应用于基于径流模型随机响应特性的集总过程评价方法。

Using a runoff system composed of a hillslope runoff generation model and a channel network, this paper derives theoretical differential equations to calculate the higher order central moments of discharge. Numerical simulation shows the results of cross-checking the validity of the derived equations. The results show the stochastic properties in a steady state are regarded as constant when the catchment area is smaller than one hundred and several tens kilometers square. The results of this study can be applicable to the evaluation method of lumping process of runoff models based on their stochastic response characteristics.