基于不同DEM数据源的胶东半岛流域特征提取对比与分析

Extracton Comparision and Analysis on Characteristics of Drainage Basin in Jiaodong Peninsula Based on Different DEM Datas

摘要:

基于SRTM和ASTER GDEM两种DEM数据源，以胶东半岛为研究区，应用ArcMap水文分析（Arc Hydro Tools）扩展模块和 “burn in”算法，提取河网及流域范围。结果显示，集水面积阈值变化直接影响数字河网密集度。对胶东半岛而言，采用分辨率为90m×90m的SRTM数据可较好地提取河网水系及划分流域；提取的11个主要流域，充分体现了胶东半岛地区的流域特征。

Abstract:

Based on SRTM and ASTER GDEM data, setting JIaodong Perninsula as the studying area, by using ArcHydro Tools Model and “burn-in” algorithm, river network and the range have been extracted. As showed by the result, the closeness of drainage network turned out to be sensitive to the threshold. For Jiaodong Peninsula, the SRTM data with resolution of 90m×90m was preferable to pick up river network and drainage basin, and the extaction results of 11 major rivers presented more reliable than the anthentic drainage area.