影响黄土高原集水面积阈值的地形因子主成分分析

发布时间：2018-03-17 06:12

本文选题：集水面积阈值　切入点：地形因子　出处：《武汉大学学报(信息科学版)》2017年05期 　论文类型：期刊论文

【摘要】：以ASTER GDEM为信息源、22个典型小流域为样区,分析黄土高原集水面积阈值与沟谷密度的关系,利用均值变点法确定最佳阈值,探讨了影响阈值的数字高程模型(digital elevation model,DEM)地形因子主成分。结果表明,集水面积阈值由北向南、自东向西逐步增大,宏观上受黄土高原地貌类型制约,地形因子对其的影响成分归纳为坡面、起伏及高程变异因子。坡面因子的最大值与阈值正相关,坡度粗糙度地形曲率平面曲率剖面曲率。起伏因子的均值与阈值正相关,起伏度切割深度。高程变异因子与阈值负相关。三者的主成分贡献率依次为58.754%、18.915%、11.388%,权重为0.527、0.229、-0.569。研究表明,坡面特征是影响黄土沟谷发育的重要因子。
[Abstract]:Using ASTER GDEM as information source and 22 typical small watersheds as sample areas, the relationship between watershed density and catchment area threshold of Loess Plateau is analyzed, and the optimum threshold is determined by means of mean value variation point method. The principal components of topographic factors of digital elevation model digital elevation model are discussed. The results show that the threshold value of catchment area increases gradually from north to south, from east to west, and is restricted by the geomorphological type of Loess Plateau macroscopically. The effects of topographic factors on them are summed up as slope surface, fluctuation and elevation variation factors. The maximum value of slope factor is positively correlated with threshold value, and the slope roughness topography curvature plane curvature profile curvature. The mean value of relief factor is positively correlated with threshold value. The variation factor of elevation is negatively correlated with the threshold value. The contribution rate of the three principal components is in turn 58.754 and 18.915 and 11.388, and the weight is 0.527 / 0.229- 0.569. the study shows that the slope characteristics are the important factors affecting the development of loess gully.
【作者单位】：中国科学院水利部水土保持研究所;南京师范大学虚拟地理环境教育部重点实验室;西华师范大学国土资源学院;
【基金】：国家自然科学基金(41101348,41101360) 中国科学院知识创新工程重点部属项目(KZZD-EW-04);中国科学院“西部之光”人才培养计划联合学者([2013]165) 西华师范大学教学改革项目(403265)~~
【分类号】：P208

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