Response of soil erosion and sediment sorting to the transport mechanism on a steep rocky slope

doi:10.1002/esp.4675

	Response of soil erosion and sediment sorting to the transport mechanism on a steep rocky slope
	Han, Zhen 2; Wang, Xiaoyan 2; Song, Dandan 2; Li, Xinxin 2; Huang, Ping1 ; Ma, Maohua1
刊名	EARTH SURFACE PROCESSES AND LANDFORMS
	2019-08-13
页码	12
关键词	rock fragment eroded sediment effective ultimate ratio enrichment ratio particle size distribution transport mechanisms
ISSN号	0197-9337
DOI	10.1002/esp.4675
通讯作者	Wang, Xiaoyan(wxy8388@gmail.com)
英文摘要	A deeper understanding of the sediment characteristics associated with rock fragment content can improve our knowledge of the erosional processes and transport mechanisms of sediments on steep rocky slopes. This research used simulated rainfall experiments lasting for 1 h at a rate of 90 mm h(-1) and employed 5 x 1 x 0.4 m parallel troughs filled with purple soils with different rock fragment volumetric contents (0, 5, 10, 20, 30 and 40%) on a 15 degrees slope gradient. For each simulated event, runoff and sediment were sampled at 1- and 3-min intervals, respectively, to study, in detail, the temporal changes in the size distributions of the eroded sediments. The results show that sediment concentrations, soil erosion rates and soil loss ratios significantly decreased as rock fragment content increased for rock fragment contents from 0 to 40% in purple soils. During the transportation process, clay particles often formed aggregates and were then transported as larger particles. Silt particles were more likely to be transported as primary particles with a low degree of sediment aggregation. Sand-sized particles, which constituted a greater proportion of the original soil than the eroded sediments, were formed from other fine particles and transported as aggregates rather than as primary particles. Suspension-saltation, which mainly transports fine particles of 0.02-0.05 mm and coarse particles larger than 0.5 mm in size, was the most important transport mechanism on steep rocky slopes. The results of this study can help to explain the inherent laws of erosional processes on steep rocky slopes and can provide a foundation for improving physical models of soil erosion. (c) 2019 John Wiley & Sons, Ltd.
资助项目	Fundamental Research Funds for the Central Universities[XDJK2017B025] ; Chongqing Research Programme of Basic Research and Frontier Technology[cstc2017jcyjAX0296] ; Foundation of Graduate Research and Innovation in Chongqing[CYB18089] ; Key Laboratory of Reservoir Aquatic Environment of CAS
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	WILEY
WOS记录号	WOS:000482156400001
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/9524]
专题	中国科学院重庆绿色智能技术研究院
通讯作者	Wang, Xiaoyan
作者单位	1.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm CAS, Chongqing 400714, Peoples R China 2.Southwest Univ, Minist Educ, Key Lab Ecoenvironm Three Gorges Reg, Coll Resources & Environm, 2 Tiansheng Rd, Chongqing 400715, Peoples R China
推荐引用方式 GB/T 7714	Han, Zhen,Wang, Xiaoyan,Song, Dandan,et al. Response of soil erosion and sediment sorting to the transport mechanism on a steep rocky slope[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2019:12.
APA	Han, Zhen,Wang, Xiaoyan,Song, Dandan,Li, Xinxin,Huang, Ping,&Ma, Maohua.(2019).Response of soil erosion and sediment sorting to the transport mechanism on a steep rocky slope.EARTH SURFACE PROCESSES AND LANDFORMS,12.
MLA	Han, Zhen,et al."Response of soil erosion and sediment sorting to the transport mechanism on a steep rocky slope".EARTH SURFACE PROCESSES AND LANDFORMS (2019):12.