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中文摘要：
DEM为水文分析提供了更加多样化的研究分析途径。研究以ASTER GDEM为数据源,利用均值变点和水道分叉比综合对比分析不同区域的水文特征和流域地貌特征,对比不同区域在最佳阈值提取的河网差异及彼此间流域河道分叉比的特征。试验结果表明：清溪河样区和杏子河样区的最佳汇流阈值分别为1500和1300,其所对应的河网密度分别为0.63和0.68;不同的流域内取相同的汇流阈值时河道的分叉能力相同或相近,但河道的数目上有较大的区别。这两者的结合可以在今后的地形分析中提供必要的理论依据。
英文摘要：
Digital Elevation Model provides more diversified techniques for the hydrological analysis. Theauthors made use of mean change-point and bifurcation ratio to synthetically analyze hydrologicalcharacteristics and geomorphic features in different areas, meanwhile, compared the difference of river networkextraction through the optimal threshold and the characteristics of bifurcation ratio based on ASTER GDEM.The results indicated that the optimal convergence threshold of Qingxi river area and Xingzi river area was1500 and 1300, respectively, the drainage density was 0.63 and 0.68, respectively; the ability of branch of riverthrough the identical convergence threshold in different basin was the same or similar, but the number of thechannel had great difference. The combination of the two factors may provide a theoretical basis for the futureresearch.
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