Soil erosion topographic factor (LS): Accuracy calculated from different data sources

doi:10.1016/j.catena.2019.104334

	Soil erosion topographic factor (LS): Accuracy calculated from different data sources
	Lu, Shaojuan 2,4; Liu, Baoyuan 1,2; Hu, Yaxian 1,2,4; Fu, Suhua 2,3; Cao, Qi 2,4; Shi, Yandong 3; Huang, Tingting 3
刊名	CATENA
	2020-04-01
卷号	187 页码:12
关键词	DEM LS factor Computation error Topographic data source
ISSN号	0341-8162
DOI	10.1016/j.catena.2019.104334
通讯作者	Liu, Baoyuan(baoyuan@bnu.edu.cn) ; Hu, Yaxian(huyaxian@nwafu.edu.cn)
英文摘要	The availability and precision of topographic data determines the reliability of the calculated slope length and slope gradient (LS) factor, which limits the use of the universal soil loss equation (USLE) and its adapted versions in region-scale soil erosion risk assessment. One of the common complications is the effectiveness of topographic data with different resolutions or the compatibility of topographic data originated from different sources. In this study, the topographic data from five common sources, 5-m digital elevation model (DEM) based on 1:10,000 topographic maps (5-m topo DEM of 1:10,000), 25-m DEM derived from 1:50,000 topographic maps (25-m topo DEM of 1:50,000), 30-m ASTER GDEM, 30-m and 90-m SRTM DEMs, were individually applied to calculate the IS factors of five catchments with distinct terrain characteristics. Our results show that the computation accuracy of the IS factors in the five study catchments decreased with greater grid sizes derived from the five topographic data sources. Compared to the most precision 5-m topo DEM of 1:10,000, the relative computation error of the mean LS factors was less than 10% when calculated from the 25-m topo DEM of 1:50,000, and that was less than 25% from the 30-m ASTER and 30-m SRTM DEMs. For scenarios in gently rolling areas, the 90-m SRTM DEM with the relative computation error less than 15% could be recommended when there are noises on the open sources DEMs surface. Therefore, depending on the requirements of data accuracy, different data sources can be applied individually or in combined to obtain the optimal predictions of the LS factors. However, such recommendations on data sources proposed in this study appeared to be more applicable for regions with complex terrains. Further studies over a range of terrain features and spatial scales are required to validate the effectiveness of different topographic data sources in calculating the LS factor.
资助项目	National Natural Sciences Foundation of China[41701318] ; National Key Research and Development Program of China[2018YFC0507001] ; Chinese Academy of Sciences (CAS) light of West China' program
WOS关键词	DIGITAL ELEVATION MODELS ; ASTER GDEM V2 ; LOSS EQUATION ; SLOPE ; UNCERTAINTY ; RESOLUTION ; DEM ; GEOMORPHOMETRY ; SUITABILITY ; SCALES
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000514020400040
资助机构	National Natural Sciences Foundation of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences (CAS) light of West China' program
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/132657]
专题	中国科学院地理科学与资源研究所
通讯作者	Liu, Baoyuan; Hu, Yaxian
作者单位	1.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Beijing Normal Univ, Fac Geog Sci, Beijing 100875, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Lu, Shaojuan,Liu, Baoyuan,Hu, Yaxian,et al. Soil erosion topographic factor (LS): Accuracy calculated from different data sources[J]. CATENA,2020,187:12.
APA	Lu, Shaojuan.,Liu, Baoyuan.,Hu, Yaxian.,Fu, Suhua.,Cao, Qi.,...&Huang, Tingting.(2020).Soil erosion topographic factor (LS): Accuracy calculated from different data sources.CATENA,187,12.
MLA	Lu, Shaojuan,et al."Soil erosion topographic factor (LS): Accuracy calculated from different data sources".CATENA 187(2020):12.