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将分布式水文模型与土壤侵蚀产沙模型相互嵌套,构建了一个分布式流域水沙预报模型。模型基于DEM,将流域离散为“坡面+沟道”系统,采用“+1”分级方法将沟道组织为河网,实现了流域水沙预报的并行计算。坡面单元划分为植被层、地表层、非饱和带和地下水层,模拟了降雨、截留、蒸散发、入渗、地表径流、壤中流和地下水、各种形式的侵蚀产沙及泥沙输移;沟道进行汇流演算以及泥沙输移。模型在李子溪流域对长系列降雨的模拟结果表明,模型的水文模块模拟精度良好,侵蚀产沙模块模拟效果基本令人满意。
The distributed hydrological model and the model of soil erosion and sediment are nested with each other, and a water and sediment forecasting model of distributed river basin is constructed. Based on DEM, the model is divided into “slope + channel” system, and the channel is organized into river network by “+ 1” classification method, which realizes the parallel calculation of water and sediment in the basin. The slope units are divided into vegetation layer, surface layer, unsaturated zone and groundwater layer, which simulate various forms of erosion and sediment transport such as rainfall, interception, evapotranspiration, infiltration, surface runoff, mid-flow and groundwater Channel calculations and sediment transport. Simulation results of long series of rainfall in the Lizi River Basin show that the hydrological module of the model has good simulation accuracy and the simulation results of the model are satisfactory.