摘要
利用InfoWorks ICM模型建立F市某建成区的排水管网模型,基于参数灵敏度分析,比较泰森多边形、GIS数字水文和人工绘制这3种汇水区划分方式以及高、中高、中、低这4种划分精度对模拟结果的影响。结果表明,不同划分方式和精度主要对模型中的汇水区性状参数造成扰动,导致模型模拟结果存在差异。在各降雨强度下,产流表面坡度对峰现时间和积水量均有一定影响,受其影响较小的平原城市地区宜采用泰森多边形法,地形起伏较大区域则宜选用GIS划分方法;汇水区面积和汇流宽度对峰值流量、径流总量和积水量均有显著影响,且对积水量起决定性作用;以排涝防洪为主导需求时,宜采用中高或高精度划分汇水区。在模型建立过程中应综合考虑研究目标、区域尺度和降雨特征等合理选取汇水区划分方式与精度。
A sewerage system in F city was modeled in InfoWorks ICM. Three methods for the division of the drainage catchments,namely Thiessen polygon,GIS digital hydrological analysis and manual division,and four levels of division precisions,including high,medium high,medium and low,were utilized to conduct a sensitivity analysis on the simulation results. The results showed dependency to division methods and precisions. The Thiessen polygon method and the GIS analysis method were recommended for use in the plain urban area and the undulating terrain respectively,because the catchment slope demonstrated some impacts on the peak time and the flood volume. The catchment area and width showed significant influences on the peak flow,total runoff,and flood volume. High or medium high division precision was recommended when flood control and drainage were the top priorities.Study objectives,regional scales,and rainfall characteristics were critical factors in choosing the division method and precision of catchment in the process of model establishment.
作者
言铭
魏忠庆
黄永捷
黄翔峰
陆丽君
YAN Ming;WEI Zhong-qing;HUANG Yong-jie;HUANG Xiang-feng;LU Li-jun(State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;Fuzhou Urban Construction Design and Research Institute Company Limited,Fuzhou 350001,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2019年第1期111-117,共7页
China Water & Wastewater
