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基于DEM的格尔木河流域水系分维分析

DOI: 10.6046/gtzyyg.2013.01.20, PP. 111-116

Keywords: DEM,格尔木河流域,分维,汇流累积量阈值

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Abstract:

分形理论为流域的复杂地貌形态及其发育过程等方面提供了定量依据,为进一步深化流域水系的分形研究,以ASTER-GDEM数据为基础资料,运用GIS水文分析工具提取了格尔木河流域在不同汇流累积量阈值下的水系河网;并用盒维数法计算了相应的水系分维数,以此来描述流域的地貌形态特征;并进一步预测流域地貌的发育演化趋势。研究结果表明:在一定无标区间范围内,汇流累积量阈值和分维数拟合较好;计算得到格尔木河流域的水系分维值处于1.6~1.8之间,据此可以判断出该流域处于地貌侵蚀发育壮年期,并向壮年晚期发展,流域地势起伏大,地面切割得支离破碎、崎岖不平,河流以侧蚀为主,下切作用相对较弱,与流域高程面积积分值计算所得结论一致。

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