大尺度平原城市精细汇水区分级划分研究

在城市内涝模拟研究中,汇水区划分是十分重要的环节,同时对大尺度平原城市进行汇水区精细划分也是研究者共同研究的技术难点.针对现有基于DEM流向分析的划分方法存在的无法正确反映实际城市复杂地形和流向问题,本文提出了一种顾及地类和流向,适用于大尺度平原城市的精细汇水区分级划分方法.首先,从城市自然地形和主干河流出发,进行一级...

Research on classification of fine catchment in large-scale plain cities

In the study of urban waterlogging simulation, the division of catchment areas is a very important link. At the same time, the fine division of catchment areas of large-scale plain cities is also a technical difficulty that researchers jointly study. Aiming at the problems of the existing classification methods based on DEM flow analysis that cannot correctly reflect the complex terrain and flow directions of actual cities, this paper proposes a fine watershed classification method that takes into account land types and flow directions and is suitable for large-scale plain cities. First, starting from the city's natural topography and main rivers, the first-level macro-scale division is carried out. and then the second-level meso-scale division is realized based on the city's main and secondary arterial roads, main canals and pipe networks. Finally, on the basis of the second division, the flow direction the land type is divided into a fine three-level subcatchment micro-scale. This paper selects the 30 km² core main urban area of Dongying City for verification and analysis. The research results show that the classification results are consistent with the actual feature types and real flow directions. This method has good applicability to large-scale plain cities.