北江流域城市防护区超标准洪水演进模拟  

Simulation of extraordinary flood routing in urban protection zones of Beijiang River Basin

作　　者：王睿璞 练伟航[1,2,3] 蔡素芳 何书琴[1,2,3] 黄东 WANG Ruipu;LIAN Weihang;CAI Sufang;HE Shuqin;HUANG Dong(Guangdong Research Institute of Water Resources and Water Resources Hydropower,Guangzhou 510635,China;Guangdong Key Laboratory of Hydrodynamic Research,Guangdong 510635,China;State and Local Joint Engineering Laboratory of Estuarine Hydraulic Technology,Guangzhou 510635,China)

机构地区：[1]广东省水利水电科学研究院,广东广州510635 [2]广东省水动力学应用研究重点实验室,广东广州510635 [3]河口水利技术国家地方联合工程实验室,广东广州510635

出　　处：《水利水电快报》2024年第8期10-16,共7页Express Water Resources & Hydropower Information

基　　金：广东省水利科技创新项目(2023-06);广州市科技计划项目基础与应用研究项目(202201011165)。

摘　　要：在气候变化和人类活动共同影响下,极端水文事件发生概率增大,城市面临超标准洪水风险日益增加。为分析超标准洪水对北江流域城市防护区影响,以广东省英德市英城防护区为例,建立一、二维耦合数学模型,分析漫溢和溃堤情况下超标准洪水演进特征及其对防护区重要地物的影响。结果表明:超标准洪水条件下英城防护区主要洪水风险为堤防决口;洪水重现期由50 a增至200 a,漫溢条件下淹没面积由2.46 km^(2)增至5.52 km^(2);溃堤后,淹没面积由7.18 km^(2)增至14.24 km^(2),淹没水深最大值超过3.5 m,洪水由溃口向英城防护区演进,总体上最大流速为0.05~3.00 m/s,但溃口附近最大流速超过6 m/s。Under the combined influence of climate change and human activities,the probability of extreme hydrological events and the risk of over-standard flooding are increasing.In order to analyze the impact of the extraordinary flood on the protection area of Beijiang River Basin,taking Yingcheng protection area of Yingde City as an example,1D-2D coupled hydrodynamic model was established to analyze the extraordinary flood evolution characteristics and its impact on the important features of the protection area under the condition of overflow and embankment break.The results showed that the main flood risk in Yingcheng protection area was embankment break.When the flood recurrence period increased from 50 years to 200 years,the inundated area would increase from 2.46 km^(2)to 5.52 km^(2)under the overflow condition.When the embankment broke,the inundation area would increase from 7.18 km^(2)to 14.24 km^(2),the maximum inundation depth exceed 3.5 m,and the flood rapidly evolved from the breach to the Yingcheng protection area,with the overall maximum flow velocity ranging from 0.05 m/s to 3 m/s,but the flow velocity near the breach exceeded 6 m/s.The research results can provide a reference for flood control and disaster reduction in Beijiang River Basin.

关 键 词：洪水演进 堤防溃决 一、二维耦和数学模型 超标准洪水 北江流域 

分 类 号：TV122[水利工程—水文学及水资源]