摘要
城市积水、内涝问题随城镇化进程的不断加快而日益严重。为有效解决这一问题,分析其出现的原因,以武汉市谌家矶片区为例,基于SWMM模型,结合城市DEM数据和雨水管网规划数据构建了城市排水模型,以溢流雨水井数量和超载管段长度为评价指标,模拟了不同雨峰位置系数和径流系数下雨水管的排水能力,并对评估指标做归一化处理,评估了雨峰位置系数和径流系数对城市排水的影响。结果表明:(1)积水雨水井数量、超载管段长度均正相关于径流系数和雨峰位置系数,城市积水内涝情况随径流系数和雨峰位置系数的增大而加剧,且受径流系数的影响更为严重;(2)不同评价指标下的相对敏感度有明显差异,径流系数对地面积水影响较大,雨峰位置系数对管段超载影响较大。
Urban waterlogging problems become more and more serious with the continuous acceleration of urbanization.In order to solve this problem effectively and analyze the causes,taking Shengjiaji area in Wuhan City as an example,based on Storm Water Management Model(SWMM),the urban drainage model was constructed combined with urban DEM data and rainwater pipe network data,and drainage capacity of rain pipes with different rainfall peak coefficient and runoff coefficient was simulated by taking the number of overflow rainwater wells and the length of overloaded pipe sections as evaluation indexes,and the influence of rainfall peak coefficient and runoff coefficient on urban drainage was evaluated by normalizing the evaluation indexes.The results show that:(1)the runoff coefficient and rainfall peak coefficient are positively correlated with the number of overflow rainwater wells and the length of overloaded pipe sections.The increase of runoff coefficient and rainfall peak coefficient will aggravate urban waterlogging,and the effect of runoff coefficient on urban waterlogging is more severe than that of rainfall peak coefficient.(2)the relative sensitivity under different evaluation indexes varies significantly according to different categories.The runoff coefficient has a greater impact on surface water,while the rainfall peak location coefficient has a greater impact on pipe section overload.
作者
于永强
刘培
程发顺
YU Yongqiang;LIU Pei;CHENG Fashun(Institute of Planningand Research,Powerchina Zhongnan Engineering Corporation Limited,Changsha 400041)
出处
《中国防汛抗旱》
2023年第1期74-79,共6页
China Flood & Drought Management
关键词
内涝防治
SWMM模型
径流系数
雨峰位置系数
排水规划
雨水管网
waterlogging control
Storm Water Management Model(SWMM)
runoff coefficient
rainfall peak location coefficient
drainage planning
rainwater pipe network
