滦河流域产流特性变化趋势分析

Trend ananlysis of runoff generation characteristics of Luanhe River Basin

随着滦河流域下垫面的变化,流域产流特性也相应的发生了变化。文中分析了滦河流域存在的产流模式,通过分析径流系数变化和降雨径流相关关系,发现产流模式有从超渗产流向蓄满产流过渡或先超渗后蓄满的趋势。并选取了20世纪80年代后的几场典型较大洪水过程,分别采用所建立蓄满产流模型(新安江模型)和超渗产流模型(陕北模型)对这几场洪水进行模拟分析,通过两者模拟径流量的差值估算了产流特性变化对径流量变化的影响程度。结果表明:随着滦河流域植被覆盖率的不断提高,产流特性的这种变化对产流量有一定的减少作用,会使滦河流域径流量减少26.9%左右。

The runoff generation characteristics So the runoff generation mechanism was found excess runoff generation through the analysis of have changed with the change of underlying surface since 1980s to have changed accordingly from infiltration excess to saturation runoff coefficient and the relation between precipitation and runoff. To estimate the effects of the change of runoff patterns on runoff generation volume, Xin ~n jiang model and infiltration -excess model were applied to simulate several typical floods chosen from the sub -catchments after 1980. The differences of the modeled runoff volume between the results from Xin＇an jiang model and those from infiltration - excess model were the effects of runoff generation characteristics changes on runoff reduction. Here, it showed that the runoff of Luanhe River Basin decreased about 26.9% mainly due to the change of runoff generation characteristics.