灾害学2025，Vol.40Issue(4)：62-70,9.DOI:10.3969/j.issn.1000-811X.2025.04.010
不同降雨情景下城市内涝风险研究
Urban Waterlogging Risk Assessment Under Varied Rainfall Scenarios:A Case Study of a Region in Lanzhou City
摘要
Abstract
In recent years,influenced by extreme climate events,Northwest China has experienced a signifi-cant increase in precipitation.Compounded by inadequate urban drainage network undersized pipe diameters,cit-ies face great challenges in waterlogging problems.Focusing on the Wuyishan-Lanshan watershed in Lanzhou City,historical rainfall data from 2017 to 2023 is utilized to design five short-duration and three long-duration rainfall scenarios,employing a hydrology-hydrodynamics coupling method to establish an urban rainfall-flooding model.This model comprehensively simulates the response characteristics of multiple drainage system compo-nents,including inspection wells,drainage pipe segments,river channels,and floodways.The results indicate that under short-duration rainfall conditions,inspection wells experience an average overloading duration of ap-proximately 1 hour.As the reproduction period P increased from 1a to 20a,the proportion of pipe segments expe-riencing drainage obstruction exceeding 0.5 hours increasing significantly from 2.01%(P=1a)to 24.83%(P=20a).Road ponding initiates when the return period reaches 10 years.In contrast,under long-duration rainfall conditions,the proportion of overloaded inspection well nodes remain below 5%,demonstrating the pipe net-work's enhanced drainage capacity,sufficient river floodway capacity,and consequently lower flooding risk.关键词
城市内涝/水文-水动力学耦合法/降雨设计/排洪道/城市排水管网Key words
urban waterlogging/hydrological-hydrodynamic coupling method/rainfall design/floodway/urban drainage pipe network分类
资源环境引用本文复制引用
陈金林,赵雨荷,李鑫,任小虎,李一哲..不同降雨情景下城市内涝风险研究[J].灾害学,2025,40(4):62-70,9.基金项目
甘肃省科技计划项目"面向内陆河流域的数字孪生流域建设规程研究"(23JRZA340) （23JRZA340）
