浙江永康市棠溪流域洪涝风险分析  

Flood risk analysis of Tangxi Watershed in Yongkang City of Zhejiang Province

作　　者：刘越 黄志文 王志超 许小华 吴秋琴 LIU Yue;HUANG Zhiwen;WANG Zhichao;XU Xiaohua;WU Qiuqin(Jiangxi Academy of Water Resources Sciences,Nanchang 330000;Jiangxi Poyang Lake Basin Ecological Water Conservancy Technology Innovation Center,Nanchang 330000)

机构地区：[1]江西省水利科学院,南昌330000 [2]江西省鄱阳湖流域生态水利技术创新中心,南昌330000

出　　处：《中国防汛抗旱》2023年第10期7-12,共6页China Flood & Drought Management

基　　金：江西省重点研发计划项目(20203BBGL73224、20203BBGL73221);长江科学院开放研究基金(CKWV2021865/KY);江西省水利厅科技项目(202124ZDKT02)。

摘　　要：基于新安江模型和环境流体动力学模型(Environmental Fluid Dynamics Code,EFDC)构建山区城镇耦合洪涝模型,对浙江永康市棠溪流域洪涝问题进行分析,包括河道防洪能力评估、村落洪涝风险分析,以及洪涝村落降雨阈值分析。结果表明,棠溪流域干流防洪能力不足,部分河道较窄且过流能力不足,暴雨后易发生河道溢流,溢流洪水会淹没沿河附近房屋和农田形成洪涝灾害。其中,上弄口村河段防洪能力不足5年一遇,尚黄桥村和包坑村河段防洪能力不足10年一遇,当3 h降雨量达60 mm时,上弄口村为高风险村落,当3 h降雨量达100 mm时,尚黄桥村和包坑村为高风险村落,将这3个村落附近河道防洪标准提升至10年一遇可大大减少棠溪流域城镇的洪涝危害。Based on Xin'anjiang Model and EFDC Model,the coupled flood model of mountainous towns was constructed to analyze the flood problem of Tangxi Watershed in Yongkang City,including the assessment of river flood capacity,flood risk analysis of villages and rainfall threshold analysis of flooding villages.The results show that the flood capacity of Tangxi main stream is insufficient,some river channels are narrow and have insufficient flow capacity,which is easy to produce river overflow after rainstorm,and overflow flood will inundate houses and farmland near the river channels,resulting in flood disasters.Among them,the flood control capacity of the river reach near Shanglongkou Village is less than once every five years,and the flood control capacity near Shanghuangqiao and Baokeng villages is less than once every 10 years.When the rainfall reaches 60 mm in 3 h,Shangnongkou Village are high-risk villages,and when the rainfall reaches 100 mm in 3 h,Shanghuangqiao Village and Baokeng Village are high-risk villages.The flood standard of the river near these three villages is improved to once every 10 years.It can greatly reduce the flood hazard of the towns in the Tangxi Watershed.

关 键 词：城镇洪涝 新安江模型 EFDC模型 防洪能力 洪涝风险 降雨量阈值 

分 类 号：TU992[建筑科学—市政工程]