大尺度无管流数据城区SWMM构建及模拟——I.复杂下垫面城区数字精细化关键技术

为提高城市区域的雨洪径流模拟精度以及城区复杂下垫面数字化的精细化程度，以北京亦庄经济开发区核心区为研究区域，结合当地的自然地理条件、区域内涝特征，基于DEM、排水管道（网）数据和建设用地空间分布情况，提出了针对10 km2以上大尺度复杂下垫面城区具有普适性的子汇水区划分、排水系统概化、集流点雨水井确定的精细化处理方法。为中国城市管道流量监测数据普遍缺乏情势下城市区域雨洪径流过程模拟及洪涝灾害预警等相关研究提供了一定的技术支持。

SWMM-based rainfall-runoff simulations in large-scale urban area with no pipeline-flow observations: I: key techniques for digitalizing urban area with complicated land-surface characteristics

In order to improve rainfall-runoff simulations in urban area and enhance the details of digitalized urban area with complicated land-surface characteristics,this study selected the core district of Yizhuang Economic Development Zone in Beijing as the study area,and the methodology of sub-catchment division,generalization of drainage pipe networks,and identification of outfall drainage wells was proposed for large-scale urban regions larger than 10 km² with complicated land-surface characteristics,in which local geographical properties,regional waterlogging characteristics,and critical information such as digital elevation model,drainage pipeline networks,and land-use types were considered. This study provides technical support for the researches on rainfall-runoff simulation and disaster warning in urban areas where pipeline-flow observations are sparse in China.