周举,彭光敏,王绍旭,聂远雄,陈炼钢,施勇

• 1:南京水利科学研究院水灾害防御全国重点实验室
• 2:河海大学水文水资源学院
• 3:四川省水利规划研究院
• 4:桂林市水利电力勘测设计研究院

摘要(Abstract)：

【目的】为研究不同数字高程模型(DEM)在平原区提取河网时的适用性，【方法】收集ALOS DEM、ASTER GDEM、SRTM DEM 3种DEM数据源，选择7个代表性平原河网流域进行研究。通过河网套合差计算，分析各DEM在平原流域的河网提取精度。【结果】结果显示：各个DEM数据在地势较平坦区、湖泊区和城市区提取河网结果均存在较大误差；基于ALOS DEM提取的数字河网精度最高；使用Arc Hydro Tools的DEM修正功能，可明显提高数字河网的精度，修正后套合差均小于3%;ASTER GDEM在丘陵区的精度高于SRTM DEM,SRTM DEM在湖泊、农田、城市等地形情况下精度高于ASTER GDEM;ALOS DEM提取河网的最佳集水面积阈值为50 000,ASTER GDEM最佳集水面积阈值则为20 000,SRTM DEM提取河网的最佳集水面积阈值则为5 000。【结论】研究选取多源DEM,从多角度分析提取数字河网的影响，可以为平原区数字河网提取提供参考。

关键词(KeyWords)： DEM数据;多源;ArcGIS;河网提取;DEM修正;河网精度;影响因素

Abstract:

Keywords:

基金项目(Foundation): 广西重点研发计划(AB22080093,AB22035075);; 江苏省水利科技项目(2021033);; 国家重点研发计划课题(2023YFC320900001)

作者(Author): 周举,彭光敏,王绍旭,聂远雄,陈炼钢,施勇

DOI: 10.13928/j.cnki.wrahe.2025.01.011

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