三门峡-小浪底区间分布式水文模型构建

依据从DEM中提取的汇流网、水流路径长度和坡度等流域特征,建立了适合于黄河三门峡—小浪底区间水文过程的松散耦合型分布式水文模型．该模型用Horton下渗曲线进行单元网格的产流计算,用各产流单元的汇流时间和线性水库相结合的方法模拟洪水过程中的洪峰平移和坦化现象．对研究区域11场洪水过程的模拟结果显示,该模型基本上能将洪水总量、洪峰流量和峰现时间的误差控制在许可误差内。

Study on distributed hydrological model for Sanmenxia-Xiaolangdi section of the Yellow River

Based on some river basin characteristics collected from DEM(Digital Elevation Model), such as the confluence network, length and gradient of flow route, and slope, a loose and coupled distributed hydrological model was developed for the Sanmenxia-Xiaolangdi section. In this model, the Horton infiltration capacity curve was used to calculate the runoff generation at each grid, and the concentration time for each runoff generation element, combined with the linear reservoir technique, was adopted for simulation of transition and subsidence of flood waves. The simulation of 11 flood events occurring in this area with the model shows that the errors of the calculated results of the flood volume, the flood peak discharge, and the time of peak are within their permissible ranges.