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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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基于DEM的黄土高原面积高程积分研究
, PP. 921-932
Keywords: 面积高程积分,空间分异,黄土高原,地貌分区
Abstract:
面积高程积分(HypsometricIntegral,HI)是通过统计流域地表的高程组合信息,从而揭示流域地貌形态与发育特征的重要指标。本文以110000比例尺5m分辨率DEM数据分析流域面积高程积分计算时的影响因素,以SRTM数字高程模型数据为基本信息源,研究黄土高原重点水土流失区的面积高程积分空间分异特征。研究工作首先讨论并总结了面积高程积分的地学含义,明确了DEM分辨率以及分析面积对于面积高程积分计算的影响,并分析各地貌对象面积高程积分的相关性;然后,面向黄土高原重点水土流失区,采用面向多尺度分割的方法,基于小流域面积高程积分,实现了黄土高原重点水土流失区地貌分区。研究结果表明,DEM分辨率对于小流域面积高程积分计算影响较小,当小流域面积阈值达到10km2时,面积高程积分趋于稳定;各地貌对象中,流域面—正地形—沟沿线、山顶点—山脊线—流域边界这两组组内面积高程积分值相关性非常强;基于面积高程积分的地貌分区,与黄土高原地区水土流失分区图和输沙模数分区图具有相当程度的耦合关系,并细化了原有分区结果。
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