干旱区生态环境知识资源中心(Arid): Runoff generation and erosion processes at the rock-soil interface of outcrops with a concave surface in a rocky desertification area

Arid

DOI	10.1016/j.catena.2024.107920
	Runoff generation and erosion processes at the rock-soil interface of outcrops with a concave surface in a rocky desertification area
	Zeng, Xiu; Peng, Xudong; Liu, Tingting; Dai, Quanhou; Chen, Xingya
通讯作者	Peng, XD
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2024
卷号	239
英文摘要	Rock surface flow, originating from outcrop surfaces during rainfall, represents a distinctive form of runoff influencing surface erosion and subsurface soil leakage in karst rocky desertification areas. Despite their significance, the processes governing runoff generation and erosion at the rock-soil interface (RSI) under the influence of rock surface flow remain poorly understood. This study aims to elucidate the generation and transformation of runoff at the RSI, along with their scouring erosion effects influenced by rock surface flow from concave-shaped outcrops. Artificial rainfall experiments were conducted on simulated rock-soil structural units featuring exposed rock surfaces and unexposed RSIs of outcrops with concave shapes. Two driving factors, namely rainfall intensity (R) and the inclination of the rock surface (I-RS), were manipulated to investigate the formation and output processes of runoffs and sediments from the surface, RSI, and non-RSI (a site away from the RSI). The presence of an exposed rock surface altered the distribution pattern of rainfall-infiltration-runoff. An increase in the I-RS led to a significant decrease in surface runoff (p < 0.05). When the I-RS was close to vertical, the rainfall-runoff was primarily in the form of surface runoff; however, for inclinations less than 90 degrees, the primary contributors to rainfall-runoff were the RSI and non-RSI runoffs. Surface soil erosion emerged as the predominant form of soil loss, with runoff yield demonstrating a linear positive correlation with sediment production. Both the I-RS and R were identified as significant factors affecting surface runoff and soil erosion. Notably, when the I-RS was less than 45 degrees, the total soil loss reached its minimum. Therefore, runoff generation at the RSI led to a reduction in surface runoff and an increase in subsurface runoff, contributing to soil leakage at the RSI. Nevertheless, surface erosion remained the primary mechanism of soil loss.
英文关键词	Rock-soil interface flow Rock surface flow Runoff yield Soil erosion Rocky desertification area
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001194118000001
WOS关键词	HYDROLOGICAL PROCESSES ; SPRING DISCHARGE ; BARE SLOPES ; KARST ; RAINFALL ; EPIKARST ; REGIONS ; COVER
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403142
推荐引用方式 GB/T 7714	Zeng, Xiu,Peng, Xudong,Liu, Tingting,et al. Runoff generation and erosion processes at the rock-soil interface of outcrops with a concave surface in a rocky desertification area[J],2024,239.
APA	Zeng, Xiu,Peng, Xudong,Liu, Tingting,Dai, Quanhou,&Chen, Xingya.(2024).Runoff generation and erosion processes at the rock-soil interface of outcrops with a concave surface in a rocky desertification area.CATENA,239.
MLA	Zeng, Xiu,et al."Runoff generation and erosion processes at the rock-soil interface of outcrops with a concave surface in a rocky desertification area".CATENA 239(2024).