干旱区生态环境知识资源中心(Arid): Rock surface flow accelerates rill erosion of excavated slopes in karst mining areas

Arid

DOI	10.1016/j.catena.2023.107739
	Rock surface flow accelerates rill erosion of excavated slopes in karst mining areas
	Ao, Liman; Xu, Qinxue; Zhou, Yangchi; Wu, Yaoqin; Zhang, Shuaipu; Fu, Zhiyong; Chen, Hongsong
通讯作者	Xu, QX
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2024
卷号	236
英文摘要	Rock surface flow is the secondary distribution of precipitation and inflow on the rock surface, an essential runoff generation mode in karst areas. The effects of rock surface flow on soil erosion in karst regions cannot be ignored. However, its impact on rill erosion in karst slopes remains unclear. The objectives of this study were to investigate the impact of rock surface flow on rill erosion, rill morphological characteristics, rill flow hydraulic characteristics, and hydrodynamic mechanisms. A field runoff plot (3 m long, 1 m wide and 0.3 m deep) with three inflow rates (2, 3, and 4 L/min) was subjected to runoff simulation experiments under two typical rock surface morphologies in karst areas: smooth rock surface (SRS) and karren rock surface (KRS), with bare slope (BS) as the control group. The results revealed that rock surface flow aggravated the soil and water loss of the excavated slope. Compared to BS, the runoff yield for SRS and KRS increased by 81.49 % and 61.91 %, respectively. Meanwhile, the soil loss of SRS and KRS were 2.50 times and 5.56 times greater. The rills below the rock outcrops didn't develop into a rill network after formation, owing to the rock surface morphology. Rill depth was the best indicator of rill morphology for evaluating rill erosion on slopes below rock outcrops. The Reynolds number and Darcy-Weisbach resistance coefficient were the optimal hydraulic parameters to predict the rill erosion of the SRS and KRS, respectively. At the same time, the runoff power and flow shear stress were the best hydrodynamic parameters to describe the rill erosion mechanism of SRS and KRS. These results provide a scientific basis for further understanding the mechanism of soil erosion on karst slopes and for preventing soil erosion on karst slopes in mining areas.
英文关键词	Karst Rock outcrops Rill erosion Rill morphology Hydrodynamic mechanism
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001139863000001
WOS关键词	SOIL-EROSION ; HYDROLOGICAL PROCESSES ; RAINFALL SIMULATION ; FRAGMENT COVER ; RUNOFF ; WATER ; DESERTIFICATION ; INFLOW ; SEDIMENT ; GRADIENT
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/2XILL650/403130
推荐引用方式 GB/T 7714	Ao, Liman,Xu, Qinxue,Zhou, Yangchi,et al. Rock surface flow accelerates rill erosion of excavated slopes in karst mining areas[J],2024,236.
APA	Ao, Liman.,Xu, Qinxue.,Zhou, Yangchi.,Wu, Yaoqin.,Zhang, Shuaipu.,...&Chen, Hongsong.(2024).Rock surface flow accelerates rill erosion of excavated slopes in karst mining areas.CATENA,236.
MLA	Ao, Liman,et al."Rock surface flow accelerates rill erosion of excavated slopes in karst mining areas".CATENA 236(2024).