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综合径流系数是城市雨水管网规划设计和等流时线模型构建的重要参数。基于可获得的遥感图像,通过汇水子区域划分、地表覆盖非监督和监督分类、DEM坡度分析和GIS叠置分析等步骤,获得不同地表覆盖和坡度条件下的面积权重,并根据相关类型区域径流系数的经验数值,获得区域综合径流系数。将按照该方法获得的径流系数输入到Mike Urban等流时线模型中,模拟结果与实测结果的Nash系数达到0.57,初步证实了该方法的可行性。
The integrated runoff coefficient is an important parameter in the planning and design of urban stormwater network and the construction of the equivalent flowline model. Based on the available remote sensing images, the area weights under different land cover and slope conditions are obtained through the methods of catchment subsection, unsupervised and supervised classification, DEM slope analysis and GIS overlay analysis. According to the correlation type area The empirical value of runoff coefficient, access to regional integrated runoff coefficient. The runoff coefficient obtained according to this method was input into the time series model of Mike Urban. The Nash coefficient of the simulation result and the measured result reached 0.57, which proves the feasibility of the method.