改进局部等体积算法下的城市内涝情景模拟  

Urban Waterlogging Simulation Based on Improved Local Equal Volume Algorithm

作　　者：付杨康 FU Yangkang(Guangzhou Urban Renewal Land Preparation and Guarantee Center,Guangzhou 510000,China)

机构地区：[1]广州市城市更新土地整备保障中心,广东广州510000

出　　处：《测绘与空间地理信息》2023年第11期132-135,共4页Geomatics & Spatial Information Technology

摘　　要：针对城市内涝问题,提出一种改进的局部等体积地表径流汇流模型。首先基于SCS模型获取地表产流;其次通过结合形态学重构方法对分水岭分割算法进行改进,获得相应的子汇水区,提升局部等体积汇流模型的精度;最后以武汉市中心城区为研究区,对模拟结果进行评价。结果显示:1)10 a、50 a重现期下的内涝模拟精度分别为78.1%和78.6%,模拟精度良好;2)最大积水深度、总积水面积、严重积水面积和总积水水量均与重现期呈正相关,并在降雨峰值处,各参数增长趋势均为最大;3)武汉城区2 h短历时降雨过程中,1 a重现期为城市内涝是否严重的分水岭;4)武汉城区暴雨内涝主要集中在江汉区和江岸区。Aiming at urban waterlogging problems,this paper proposes an improved local equal-volume surface runoff confluence model.First,the surface runoff was obtained based on the SCS model;then,the watershed segmentation algorithm was improved by combining morphological reconstruction methods to obtain the corresponding sub-catchment areas to improve the accuracy of the local equal volume confluence model;and finally,the center of Wuhan was used as the research area in order to evaluate the simulation results.The results show that:(1)The accuracy of waterlogging simulation under the 10 a and 50 a recurring periods is 78.1%and 78.6%,respectively,the simulation accuracy is good;(2)The large water depth,total water area,severe water area and total water volume are all positively related to the recurrence period,and the growth trends of all parameters are the largest at the peak rainfall;(3)During the 2 h short-duration rainfall in Wuhan urban area,the 1 a recurrence period is the watershed of whether the urban waterlogging is serious;(4)The heavy rain and waterlogging in the urban area of Wuhan is mainly concentrated in Jianghan District and Jiang'an District.

关 键 词：形态学重构 分水岭分割 局部等体积 城市内涝 

分 类 号：P237[天文地球—摄影测量与遥感]