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针对自然流域地形地貌对地表径流滞留的影响,将流域坡面汇流概化为二维模式,采用二维运动波汇流模型计算坡面汇流,应用二维运动波隐式差分方法进行求解,结合DEM技术,基于考虑土壤水分再分配的Green-Ampt超渗产流模型,河道汇流采用一维运动波汇流,构建了基于栅格的Grid-GA-2D模型,并将其与Grid-GA及陕北模型应用于黄河支流沁河孔家坡站以上流域,探讨了模型的适用性。结果表明,3个模型均能较好地模拟水文过程,其中Grid-GA-2D模型洪峰模拟效果更好。
Aiming at the influence of topography of natural watershed on runoff retention in surface watersheds, the confluence of watershed slopes is generalized into two-dimensional model. Two-dimensional motion wave convergence model is used to calculate the confluence of slopes. Two-dimensional motion wave implicit difference method is used to solve the problem. Combined with DEM Based on the Green-Ampt model, a grid-based GA-2D grid-based GA-2D model was constructed based on the Green-Ampt model. The grid-GA model and the North Shaanxi The model is applied to the basin above the Kongjiapo Station of the Qinhe River, a tributary of the Yellow River, and the applicability of the model is discussed. The results show that all three models can simulate the hydrological process well, and the simulation of the peak of Grid-GA-2D model is better.