基于城市时变增益模型的佛山市城市雨洪过程模拟研究  

Case Study of Urban Stormwater Simulation in Foshan Based on Urban Time-Variant Gain Model

作　　者：王超 龚斯淇 肖羽 WANG Chao;GONG Siqi;XIAO Yu(Foshan Hydrology Branch of Guangdong Hydrology Bureau,Foshan 528000,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Hubei Key Laboratory of Water System Science for Sponge City Construction,Wuhan 430072,China)

机构地区：[1]广东省水文局佛山水文分局,广东佛山528000 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [3]海绵城市建设水系统科学湖北省重点实验室,湖北武汉430072

出　　处：《人民珠江》2023年第10期140-148,156,共10页Pearl River

基　　金：国家自然科学基金重大项目(41890823)。

摘　　要：准确把握城市降雨-径流响应规律,是模拟和分析城市雨洪过程的前提。以佛山市禅城区保利同济府小区为研究对象,分析实测降雨径流之间的非线性响应规律,并构建TVGM-urban模型,对实测降雨及不同重现期设计暴雨情景进行了模拟和分析。结果表明:城市的降雨径流之间存在幂函数相关性,最大降雨强度和洪峰流量之间的非线性关系,可通过在保利同济府小区挑选出的8场次洪数据进行验证,其幂函数拟合效果(R^(2)=0.6207,p<0.05)优于线性关系(R^(2)=0.5629,p<0.05);基于汇水区范围识别及下垫面分类,在保利同济府小区构建了TVGM-urban模型,并通过实测降雨径流资料验证了模型精度。整体上,模拟结果基本能保证纳什效率系数大于0.7,水量与峰值的模拟误差在20%以内,能较好地满足城市雨洪的模拟需求。研究结果可为城市降雨径流响应规律分析及城市雨洪模拟的研究提供重要的支撑和参考。The prerequisite for urban stormwater simulation and analysis is to accurately grasp urban rainfall-runoff response laws.This paper analyzes the nonlinear response law of rainfall-runoff and builds a TVGM-urban model to simulate and analyze the measured rainfall and storm scenarios designed under different recurrence periods by taking the Baolitongjifu neighborhood in Chancheng District,Foshan as the research object.The results are as follows.There is a power function correlation between rainfall and runoff in the city.The non-linear relationship between maximum rainfall intensity and peak flood flow can be verified by eight selected flood data in the neighborhood with the fitting effect of the power function(R^(2)=0.6207,p<0.05)better than that of the linear relationship(R^(2)=0.5629,p<0.05).Based on the identification of the catchment area and the subsurface classification,the TVGM-urban model is built in the Baolitongjifu neighborhood,and the model accuracy is verified by the measured rainfall and runoff data.Generally,the simulation results ensure that the Nash efficiency coefficient is greater than 0.7,and the simulation error of the water volume and peak value is within 20%,which can well meet the urban stormwater simulation requirements.The results can provide support and references for analyzing urban rainfall and runoff response laws and studying urban stormwater simulation.

关 键 词：城市内涝 城市雨洪模拟 非线性关系 TVGM-urban模型 重现期 

分 类 号：P333.2[天文地球—水文科学]