曲线数值法(SCS模型)在北京温榆河流域降雨－径流关系中的应用研究

为研究北京城市化进程中降雨-径流关系变化,在温榆河流域应用SCS模型,对该流域部分实测次降雨-径流过程及不同频率年降雨-径流进行模拟,得出SCS模型在温榆河流域预测径流是可行的,无论哪种前期土壤湿润条件,不同频率降雨的年径流量随着时间的推移有增大的趋势,相同前期土壤湿润情况下年径流量绝对增量顺序为,丰水年＞平水年＞枯水年,而相对增量是枯水年＞平水年＞丰水年.相同前期土壤湿润程度及相同频率降雨条件下,城市化水平越高,径流量越大.

Application of SCS model to simulate rainfall-runoff relationship in Wenyu river basin in Beijing

In order to study the changes between rainfall and runoff in the urbanization process of Beijing, the SCS model was applied to simulate the process of rainfall and runoff with some observed data in the Wenyu river basin. In addition, the changes of rainfall and runoff relationship in different hydrological years were also simulated. The results show that it is feasible to predict runoff using the SCS model in Wenyu river basin. No matter what the antecedent moisture condition is, annual runoff with different frequency of precipitation has an increase tendency as time goes on. In the same antecedent moisture condition, the absolute increase of annual runoff is followed by: wet year> normal year>dry year, but the relative increasion is: dry year>normal year> wet year. Under the same condition of antecedent moisture and rainfall frequency, the higher the level of urbanization is, the greater the runoff is.