海河流域平原区降雨产流模型研究

Study on the Rainfall-Runoff Model in the Plain Area of Haihe River Basin

通过对海河流域平原区降雨产流机理进行研究,得出耕地灌溉率提高、地下水埋深增加是影响平原区产流的主要下垫面要素。根据下垫面要素的变化特点,建立了模拟地下水埋深变化和灌溉耕地产流特点的蓄满-超渗产流水文模型。并通过在海河平原的大清河山前平原、大清河中部平原、黑龙港中部平原3个类型区7个田块的灌溉入渗实验,分析给出了产流模型的重要参数——耕作层下层稳定入渗率。模型在牤牛河等7个典型流域进行应用,均得到较高的模拟精度。

The improving of irrigation rate and increasing of groundwater depth is the main elements of underlying surface to influence runoff,through studying on the rainfall-runoff mechanism in plain area of Haihe river basin.The excess storage-excess infiltration runoff model,which can simulate the change of groundwater depth and response the characteristic of irrigation infield,is founded.Through the irrigating infiltration experiment of seven farmland located in piedmont plain and median plain of Daqinghe river basin and median plain of Heilonggang region,stable infiltration rate of lower cultivating layer,the most important parameter of model,is gained.And the result shows that simulation precision is higher by applying the model in Mangniu River basin and other six representative basins.