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基于多源DEM的数字流域特征提取对比分析 预览

Comparative analysis of digital watershed feature extraction based on multi-source dem
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摘要 为探讨不同DEM数据源在提取流域特征方面的优劣,本文采用HYDRO1K、SRTM3-DEM和ASTERGDEM数据,以金沙江下游干流小黄瓜园流域为研究区,详细对比了3种DEM数据源在提取流域数字特征等方面的差异。结果表明:洼地填充后,各数据的高程累积频率曲线都近似一条“S”形曲线;当DEM水平分辨率达到一定精度后,水系提取效果不会随着数据精度的提高而改善;三种DEM数据提取的子流域的平均高程相差不大,随着水平分辨率的提高,子流域平均地形起伏度和平均坡度呈增大趋势。该研究可为流域水文模拟及水资源管理等方面提供科学参考。 In order to discuss the advantages and disadvantages of different DEM data sources in extracting watershed features, this paper uses HYDRO1K, SRTM3-DEM and ASTER GDEM data, taking the Xiaohuangguayuan watershed in the lower reaches of Jinsha River as the research area, and compares the differences of three DEM data sources in extracting watershed digital features in detail. The results show that the elevation cumulative percentage curve of each data is approximately an “S” curve ,after the depression is filled. When the horizontal resolution of DEM reaches a certain accuracy, the water system extraction effect will not improve with the improvement of data accuracy. The average elevations of the sub-basins extracted from the three DEM data are not much different. With the improvement of horizontal resolution, the average topographic relief and average slope of the sub-basins show an increasing trend. This study provides scientific reference for watershed hydrological simulation and water resources management.
作者 李世有 LI Shiyou(Lüchun County Water Affairs Bureau,Lüchun 662500,China)
机构地区 绿春县水务局
出处 《水资源开发与管理》 2019年第7期17-23,共7页 Water Resources Development & Management
关键词 DEM 数字流域 水文特征 DEM digital watershed hydrological characteristics
作者简介 李世有(1976-),男,高级工程师,学士,主要从事水文计算、水利规划等工作.
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