雨水管网模型子汇水区划分与模拟精度  

Subcatchment division and simulation precision of rainwater pipe network model

作　　者：杨佳利 徐拥军 梁藉[1] 唐颖 刘子龙[4] YANG Jiali;XU Yongjun;LIANG Ji;TANG Ying;LIU Zilong(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 4730074,China;Huadong Engineering Corporation Limited,Southeast Regional Headquarters,Power Construction Corporation of China,Hangzhou 311100,China;Department of Urban Construction,Beijing City University,Beijing 100083,China;Beijing Municipal Institute of City Planning and Design,Beijing 100045,China)

机构地区：[1]华中科技大学土木与水利工程学院,武汉4730074 [2]中国电建华东勘测设计研究院有限公司东南区域总部,杭州311100 [3]北京城市学院城市建设学部,北京100083 [4]北京城市规划设计研究院,北京100045

出　　处：《南水北调与水利科技（中英文）》2022年第2期338-351,共14页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金项目(51979112);黔科合重大科技专项计划项目([2018]3010)。

摘　　要：为提升城市雨水管网模型精度,基于DEM城市地表水文分析原理,针对城市子汇水区划分不精确问题,提出一种基于盆域分析的泰森多边形子汇水区划分方法(basin analysis based Thiessen polygon subcatchment division method,BATP)。该方法综合考虑地形对雨水管网模型模拟精度的影响,利用数字高程模型数据进行盆域分析获得初级子汇水区,并进一步运用泰森多边形法划分出模型子汇水区。将BATP方法分别与人工绘制法、传统泰森多边形法进行对比,分析不同汇水区划分方法的模拟精度。实例研究表明:BATP方法的模拟结果与实测数据拟合度最佳,井下液位的峰值、流量峰值和总流量偏差分别为1.115%、1.301%、6.796%。所提出的子汇水区划分方法能获得更高模拟精度的城市雨水管网模型。研究成果可为城市排水防涝模拟提供更加合理的建模方法。In recent years,it is common for cities to accumulate rain and flood during rainstorm.On the one hand,due to the negative impact of human activities on the environment,extreme rainstorm events occur frequently.On the other hand,with the acceleration of urbanization,urban hardening road surface increases,green space decreases,urban rainwater infiltration capacity is insufficient,easy to form waterlogging water.To solve urban waterlogging problem,urban waterlogging model needs to be built.An important part of urban waterlogging model is urban stormwater pipe network model.The key step of urban rainwater pipe network model construction is the division of sub-catchment area,and the division result has great influence on the simulation accuracy of urban rainwater pipe network.Based on the theory of surface hydrological analysis of urban DEM,a basin analysis based Thiessen polygon subcatchment division method was proposed to solve the problem of inaccurate division of urban subcatchment area.This method took into account the effect of topography on the simulation accuracy of stormwater pipe network model.Basin analysis was carried out based on the raster data of the high resolution urban digital elevation model,and the runoff unit with concentrated catchment area was divided.The elevation variation in the runoff unit was small,and the runoff unit was defined as the primary sub-catchment area.The primary catchment area was revised to ensure that there are pipe network nodes in each primary catchment area.The primary catchment area was subdivided by Thiessen polygon method and the corresponding sub-catchment area was obtained.Taking a certain area in Beijing as an example,the basin analysis based Thiessen polygon subcatchment division method was compared with the two most commonly used subcatchment partitioning methods:manual drawing method and traditional Thiessen polygon method.The manual drawing method is a method for professionals to manually delineate the sub-catchment area corresponding to each pipe network node ac

关 键 词：雨水管网模型 子汇水区划分 盆域分析 泰森多边形法 

分 类 号：TV213.4[水利工程—水文学及水资源]