摘要
城市超标准洪水严重威胁区域经济社会和生命财产的安全,该研究以经济发达、人口密度高的广州市黄埔区为研究对象,通过构建区域二维水动力数学模型,分别计算了50年一遇重现期下,主要河道及水库出现漫堤、溃堤、溃坝等情况下区域的洪水淹没情况,确定了主要受灾区域,并针对性地提出了防御对策。研究成果表明,堤防漫堤导致南岗河淹没最严重,需要对等级在5级以下的4.4 km堤防进行达标加固;平岗河是堤防溃决风险最大的河流,其次是细陂河和凤凰河,需要重点防御;水库溃坝导致距离溃口近和地势低洼地区的淹没水深大,风险等级高,需从监测预警、应急响应、避险转移以及救援保障等方面对该区域加强防御,研究成果可为区域应对超标准洪水提供技术支撑。
Urban floods exceeding the standard pose a serious threat to the economic,social,and life safety as well as property.This study focuses on Huangpu District,a developed area with a high population density in Guangzhou City.By constructing a regional two-dimensional hydrodynamic model,the flood inundation in the region under the condition of a 50-year return period was calculated when major rivers and reservoirs experienced situations such as dike overtopping,dike break,and dam break.The main affected areas were identified,and targeted defense measures were proposed.The research findings indicate that the most severe inundation due to dike overflow occurs in Nangang River,where dike with grades below 5 should be reinforced to meet the standard.Pinggang River poses the highest risk of dike failure,followed by Xibei River and Fenghuang River,requiring focused defense efforts.Dam break result in significant flooding in areas close to the dam and with low-lying terrain,indicating a high risk level.Strengthening defense capabilities in terms of monitoring and early warning,emergency response,evacuation,and rescue support is crucial for the region.The research findings provide technical support for the region s response to the super-standard floods.
作者
杨举
王艺浩
YANG Ju;WANG Yihao(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,China;Guangdong Key Laboratory of Hydrodynamic Research,Guangzhou 510635,China)
出处
《广东水利水电》
2024年第9期113-118,126,共7页
Guangdong Water Resources and Hydropower
基金
国家自然科学基金地区科学基金项目(编号:42161055)。
关键词
超标准洪水
洪水演进
风险评估
防御对策
super-standard flood
flood routing
risk assessment
defense countermeasures
