Experimental investigations of the evolution of step-pools in rills with heterogeneous soils in Yuanmou Dry-Hot Valley, SW China

doi:10.1016/j.catena.2020.104690

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Experimental investigations of the evolution of step-pools in rills with heterogeneous soils in Yuanmou Dry-Hot Valley, SW China
	Deng Qingchun 1,3; Liu Hui 1,3; Cheng Weihua 1,3; Yang Haiqing 3; Liu Gangcai 2; Luo Jun 1,3; Qin Fachao 3; Yang Dan 1,3; Zhang Bin 1,3
刊名	CATENA
	2020
卷号	194 页码:104690
关键词	Step-pool evolution Geometrical parameters Field-scouring experiment Rill Statistical analysis
ISSN号	0341-8162
DOI	10.1016/j.catena.2020.104690
产权排序	3
文献子类	Article
英文摘要	As a common type of microtopography in rill channels, the formation and dynamics of step-pools are prerequisites for the occurrence of rills. However, the evolution of step-pools in a rill (SPRs) is still unclear. Scouring experiments in field plots were conducted to explore the dynamic evolution of SPRs and the effect of steps on pools under conditions of strong runoff and soil-like materials aggregated with gravels in Yuanmou Dry-Hot Valley (SW China). Using three-dimensional laser scanning, spatial analysis of a GIS (geographic information system), and statistical analysis, 11 parameters were used to characterize step-pool morphology. The results showed that SPRs formed after several scourings at particular locations, and some of them disappeared in the late stage. A diverse range of SPRs formed, with geometrical parameters initially increasing, then stabilizing, and finally decreasing. During scouring, pool shape transformed from a deep V-shape to a shallow V-shape and then to a U-shape. The evolution of a typical pool included initial, active, stable and fading stages. There were 59 oval-shaped pools (88.06% of the total number of pools) in plane form and 37 deep pools (55.22%) in cross-section, and significant differences in the plane form and profile morphology of a pool presented themselves during its evolution. SPRs developed more easily in dry red soil-like materials compared with vertisol-like materials. The geometrical parameters of pools correlated with step size; and pools became deeper with increasing step height, and longer with increasing step height and decreasing step slope. The spatial heterogeneity of soil-like materials, as well as hydraulic conditions, led to complex and nonlinear SPR evolution. It is helpful to further understand the mechanism of rill incision and evolution.
电子版国际标准刊号	1872-6887
语种	英语
WOS记录号	WOS:000566699000026
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/46280]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Zhang Bin
作者单位	1.School of Land and Resources, China West Normal University, Nanchong 637009, PR China; 2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610045, PR China 3.Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion on Dry Valleys, China West Normal University, Nanchong 637009, PR China;
推荐引用方式 GB/T 7714	Deng Qingchun,Liu Hui,Cheng Weihua,et al. Experimental investigations of the evolution of step-pools in rills with heterogeneous soils in Yuanmou Dry-Hot Valley, SW China[J]. CATENA,2020,194:104690.
APA	Deng Qingchun.,Liu Hui.,Cheng Weihua.,Yang Haiqing.,Liu Gangcai.,...&Zhang Bin.(2020).Experimental investigations of the evolution of step-pools in rills with heterogeneous soils in Yuanmou Dry-Hot Valley, SW China.CATENA,194,104690.
MLA	Deng Qingchun,et al."Experimental investigations of the evolution of step-pools in rills with heterogeneous soils in Yuanmou Dry-Hot Valley, SW China".CATENA 194(2020):104690.