涪江通口河流域河网提取及唐家山溃流洪水模拟分析  

Simulation of Tangjiashan dam-break flood along Fujiang River based on drainage networks extract from DEM data source

作　　者：李翀[1] 陆吉康[2] 

机构地区：[1]中国水利水电科学研究院水环境研究所,北京100038 [2]中国水利水电科学研究院防洪减灾研究所,北京100038

出　　处：《中国水利水电科学研究院学报》2009年第1期1-6,共6页Journal of China Institute of Water Resources and Hydropower Research

基　　金：中国水利水电科学研究院专项基金;关键生态系统合作基金(CEPF)项目

摘　　要：基于美国Global Land Cover Facility(GLCF)的2004.3 Arc Second SRTM Elevation全球90m精度的DEM数据源,采用作者开发的DEM凹陷区域识别与处理、河网自动生成与流域划分软件,提取了四川省唐家山堰塞湖所在涪江通口河流域河网相关信息。采用具有高分辨率及高稳定性能格式精度的二维水动力学模型,将两种估算的唐家山堰塞湖溃决流量过程作为输入,估算了唐家山堰塞湖以下涪江通口河流域的洪水过程与低洼地的洪水淹没过程。结果表明,从公开的高分辨率全球DEM数据自动提取指定流域信息,采用二维水动力学模型模拟流域尺度突发洪水淹没过程的模型系统,可以快速、便捷地模拟不同流域的洪水演进过程,可为国家的洪水灾害防治分析提供实用和可靠的技术工具和手段。The Digital Elevation Models （DEM） and their extracted river network have laid a strong geological base for simulating flood routine due to rainfall-runoff. Based on the 2004 （3） Arc Second SRTM Elevation, which is a digital elevation data with 90m resolution and published by Global land Cover Facility （GLCF）, USGS, this paper presents extraction of drainage network of Fujiang river basin, where Tangjiashan Quake Lake is located in its middle reaches, by using a software on extracting drainage networks from raster DEM developed by the authors. Using 2 sets of given dam-break flood process at Tangjiashan Quake Lake and extracted drainage network, the authors apply a 2-D hydraulic model to simulate the flood in the Fujiang river basin. The result shows that the maximum flood discharge decreases sharply along the river. The inundated belt mainly stretches along the river with a width of around 2000m. The results imply that the proposed software and approach are capable to simulate dambreak flood with reasonable resolution in mountainous areas based on drainage networks extracted from grid DEM and a 2-D hydraulic model and can be used as a new tool for flood analysis and flood management.

关 键 词：DEM 河网提取 二维水动力学模型 洪水灾害 唐家山 

分 类 号：P333[天文地球—水文科学]