深圳市石岩街道洪涝风险分析  

Flood risk analysis in Shiyan subdistrict of Shenzhen City

作　　者：吴秋琴 刘训平 肖志明 黄志文 王志超 WU Qiuqin;LIU Xunping;XIAO Zhiming;HUANG Zhiwen;WANG Zhichao(Jiangxi Academy of Water Sciences and Engineering,Nanchang 330029;Shenzhen Guanghuiyuan Environmental Water Co.,Ltd.,Shenzhen 518021)

机构地区：[1]江西省水利科学院,南昌330029 [2]深圳市广汇源环境水务有限公司,深圳518021

出　　处：《中国防汛抗旱》2023年第2期46-52,共7页China Flood & Drought Management

基　　金：江西省重点研发计划项目(S2020ZPYFB2222、20203BBGL73224);长江水利委员会长江科学院开放研究基金资助项目(CKWV2021865/KY)。

摘　　要：基于MIKE flood平台,进行MIKE 11、MIKE URBAN和MIKE 21三模型耦合,构建城市洪涝模型,对深圳市石岩街道洪涝问题进行分析,包括河道防洪能力评估、管道排水能力评估、内涝风险分析及内涝发生的降雨量阈值确定。模拟结果表明:水田支流防洪能力不足2年一遇,上排河防洪能力不足5年一遇。石岩街道管道排水能力不到1年一遇的占比34.24%,满足1年一遇至5年一遇的管道占比17.59%,超5年一遇的占比48.17%,当管网标准提升至3年一遇以上就可大大提升城市排涝能力。历史上报易涝点内涝形成原因主要有:局部为低洼区,汇流面积大;管道自身排水能力不足,主要有大管接小管问题、倒坡问题、管径太小等问题;受下游河水水位顶托。分析石岩街道已上报易涝点内涝风险降雨量阈值,当3 h降雨量达20 mm时,石龙大道龙大高速出口为低风险点,降雨量达40 mm时,则变为高风险点;降雨量达60 mm时,祝龙田路龙大高速桥涵为高风险点;降雨量达70 mm时,青年路为高风险点;降雨量达80 mm时,光明路与爱群路交会口为高风险点。Based on the MIKE flood,the MIKE11, MIKE URBAN and MIKE21 are coupled to analyze the flood problem of Shiyan subdistrict in Shenzhen, including the evaluation of riverine flood control capacity, pipeline drainage capacity,flood risk analysis and the determination of rainfall threshold for waterlogging. The simulation results show that the flood control capacity of Shuitian Tributaries is less than 2 year return period, and the flood control capacity of Shangpai River is less than 5 year return period. The 34.24% of Shiyan subdistrict’s pipelines have a drainage capacity of less than once in a year, 17.59% have a return period of 1~5 years, and 48.17% have a drainage capacity of more than once in 5 years. When the pipe network standard is raised to more than once in three years, the urban drainage capacity can be greatly improved.The main causes of waterlogging at waterlogging prone points reported in history are as follows: local low-lying areas with large catchment area;insufficient drainage capacity of the pipeline itself including mainly the problems such as connecting large pipes with small pipes, adverse slope, too small pipe diameter, etc.;jacking by downstream river water level.According to the analysis, the rainfall threshold of flood is evaluated in Shiyan subdistrict. When the rainfall reaches 20 mm in 3 hours, the exit of Longda Expressway on Shilong Avenue is a low risk point, when the rainfall reaches 40 mm in3 hours, it becomes a high risk point;When the rainfall reaches 60 mm in 3 hours, the flood point at the bridge and culvert of Longda Expressway on Zhulongtian Road is a high risk point;When the rainfall reaches 70 mm in 3 hours, Qingnian Road is a high risk point;When the rainfall reaches 80 mm in 3 hours, the intersection of Guangming Road and Aiqun Road is a high risk point.

关 键 词：城市洪涝 MIKE模型 河道防洪能力评估 管道排水能力评估 内涝风险 降雨量阈值 深圳市 

分 类 号：TU998.4[建筑科学—市政工程]