基于TELEMAC-2D模型的城区水库溃坝洪水数值模拟——以广州市龙洞水库为例  

Numerical Simulation of Dam-break Flood in Urban Area Based on TELEMAC-2D Model—A Case Study for Longdong Reservoir in Guangzhou,China

作　　者：都利亚 王兆礼[1,2] 祁旭阳 赖成光[1,2,3] DU Li-ya;WANG Zhao-li;QI Xu-yang;LAI Cheng-guang(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510641,Guangdong,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510641,Guangdong,China;Guangdong Engineering Technology Research Center of Safety and Greenization for Water Conservancy Project,Guangzhou 510641,Guangdong,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641 [3]广东省水利工程安全与绿色水利工程技术研究中心,广东广州510641

出　　处：《地球科学与环境学报》2022年第5期850-859,共10页Journal of Earth Sciences and Environment

基　　金：国家重点研发计划项目(2021YFC3001002);广东省水利科技创新项目(2020-28)。

摘　　要：针对城市水库下游地区地形复杂、建筑物密集的特点,以广州市天河区龙洞水库为例,采用基于不规则网格的TELEMAC-2D模型,构建二维溃坝洪水演进模型并开展数值模拟,将模拟结果与LISFLOOD-FP、WCA-2D模型的模拟结果进行综合对比。结果表明:当模拟历时大于15 min后,TELEMAC-2D模型模拟的下游淹没区内淹没总水量与溃口流量过程线所计算的累积洪水量基本相等,二者相对误差仅为0.26%,在3种模型中误差最小;3种模型模拟的洪水演进规律基本一致,且模拟的最大水深空间分布相关性均不小于0.92,表明模拟结果科学合理;TELEMAC-2D模型可对建筑物密集区域的地形进行局部网格加密处理,能更精细地表征城区的复杂地形情况,模拟效果较LISFLOOD-FP和WCA-2D模型更好。研究结果可为城区水库溃坝洪水数值模拟、溃坝洪水预警预报以及相关防洪减灾等工作提供科学的参考依据。Considering the characteristics of complex terrain and dense buildings in the downstream of urban reservoirs,TELEMAC-2D model,which is a hydrodynamic model based on irregular triangular grid,was adopted to construct a 2D dam-break flood evolution model.Taking Longdong reservoir in Tianhe district of Guangzhou city as a case,the numerical simulation of dam-break flood was conducted,and the simulated results were comprehensively compared with LISFLOOD-FP and WCA-2D models.The results show that when the simulation duration is more than 15 minutes,the inundation volume simulated by TELEMAC-2D model is basically equal to the accumulated outflow of the dam breach based on theoretical computation results,and the relative error is merely 0.26%,which is the smallest among the three models;the flood evolution rule simulated by the three models is basically similar,and the correlation coefficients are not less than 0.92 in the spatial distribution of the simulated maximum water depth,indicating that the simulation results are scientific and reasonable;TELEMAC-2D model can carry out local mesh encryption in built-up areas,considering more details of the complex terrain and showing better performance than LISFLOOD-FP and WCA-2D models.This study can provide reference for numerical simulation,early-warning and prediction,and related work on flood control and disaster reduction of dam-break flood in urban area.

关 键 词：溃坝洪水 二维数值模拟 城区水库 TELEMAC-2D模型 LISFLOOD-FP模型 WCA-2D模型 淹没水深 

分 类 号：TV122.4[水利工程—水文学及水资源]