全国10km网格汇流模型构建与验证

Construction and Validation of 10 km Grid Concentration Flow Model in China

为解决传统大尺度分布式汇流模型存在的问题,提出了基于网格与子流域融合单元的大尺度分布式汇流模型。在构建全国10km×10km网格的汇流模型时,研究首先采用河道特征值确定了汇流模型的参数,对VIC(Variable Infiltration Capacity)模型输出的产流进行汇流演算,生成了1961~2013年全国10km×10km分辨率日尺度的网格流量数据集。研究构建的网格化汇流模型在全国径流模拟中具有一定的适用性,精度较高,尤其是在南方流域。模拟生成的全国网格化流量与实测流量一致性较好,弥补了站点实测径流资料难以全面反映大范围径流过程时空变化的不足。

In order to solve the problems in the traditional large-scale distributed concentration flow model,this paper proposed a large-scale distributed concentration flow model based on grid and sub-basin merged unit,and applied the river channel eigenvalues to determine the parameters of the model,and calculated the runoff yield outputted from Variable Infiltration Capacity(VIC)hydrology model.Then,it generated daily discharge database with a spatial resolution of 10 km×10 km during 1961-2013 in China.The model is feasible to simulate discharge and can perform higher precision in China,especially in its southern basin.