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影响黄土高原集水面积阈值的地形因子主成分分析
苟娇娇
2017-05
Source Publication武汉大学学报(信息科学版)
Volume42Issue:5Pages:704-710
Abstract

黄土高原重点流失区沟谷密度大,土壤侵蚀强烈。以ASTER GDEM为信息源、22个典型小流域为样区,分析集水面积阈值与沟谷密度的关系,基于均值变点法确定最佳阈值,探讨了影响阈值的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。主成分贡献率依次为58.754%、18.915%、11.388%;权重为0.527、0.229、-0.569。研究暗示坡面特征是影响黄土沟谷发育的重要因子。

Other Abstract

This study tris to reveal the relationship between DEM terrain attributes and flow accumulation threshold (abbreviated in FAT) used to extracted gullies in a severe soil erosion region(abbreviated in SSER) of Loess Plateau of China based on PCA, which will help to pick out the main influence factors in the initiation and development process of Loess gullies. The study region is formed by 22 typical watershed. A series of gullies density produced by different FAT is obtained, and then mean change-point is used to identity a best threshold in every watershed. After the terrain attributes are calculated based on ArcGIS, a PCA methods is used to study the relationship between them and FAT. The results show that the FAT increases from north to sorth, or from east to west in the SSER of Loess Plateau in large scale, which is consistent with the geomorphological types of Loess Plateau. The Effect of composition of the terrain Factors can be concluded into three groups, namely slope group, relief group and elevation variation group. The maximum of slope group shows a positive correlation with FAT, and the order can be described as gradient > roughness> terrain curvature> plan curvature > profile curvature. The average of relief group also shows a positive correlation with FAT, and the order as relief degree of terrain>dissection index of terrain. While elevation variation group has a negative correlation with FAT. The contribution rates of principal component are 58.754%, 18.915%, 11.388% respectively with the weights of 0.527,0.229, -0.569. The research implies that the slope characteristics are important factors affecting the development of loess gullies.

Keyword集水面积阈值 地形因子 主成分分析 黄土高原重点流失区 数字高程模型(dem)
DOI:10.13203/j.whugis20140783
Language中文
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8101
Collection水保所知识产出(1956---)
Affiliation中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
苟娇娇. 影响黄土高原集水面积阈值的地形因子主成分分析[J]. 武汉大学学报(信息科学版),2017,42(5):704-710.
APA 苟娇娇.(2017).影响黄土高原集水面积阈值的地形因子主成分分析.武汉大学学报(信息科学版),42(5),704-710.
MLA 苟娇娇."影响黄土高原集水面积阈值的地形因子主成分分析".武汉大学学报(信息科学版) 42.5(2017):704-710.
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