干旱区生态环境知识资源中心(Arid): Effects of concentrated flow changes on runoff conversion and sediment yield in gently sloping farmland in a karst area of SW China

Arid

DOI	10.1016/j.catena.2022.106331
	Effects of concentrated flow changes on runoff conversion and sediment yield in gently sloping farmland in a karst area of SW China
	Yi, Xingsong; Dai, Quanhou; Yan, Youjin; Yao, Yiwen; Lu, Yonghuan; Zhang, You; Zhu, Liekun; Xu, Xiaojin; Wang, Yong; Zhang, Yin; Du, Yue; Xu, Yusuo
通讯作者	Dai, QH
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2022
卷号	215
英文摘要	Exposed bedrock in karst areas considerably alters runoff paths causing partial runoff to converge into a concentrated flow, which is a potential source of soil erosion risk. However, research is lacking on how concentrated flow affects regional soil erosion. In this study, the surface and underground dual structure in karst areas was simulated in a steel tank. Combined with runoff plot monitoring, the runoff conversion process and erosion characteristics of gently sloping farmland in karst areas under different water discharge rates were examined through indoor concentrated flow discharge scouring tests, and the influence of concentrated flow changes on the runoff spatial distribution and sediment yield in gently sloping farmland was clarified. The results demonstrated the following: (i) there existed a significant positive correlation between surface runoff and the water discharge rate (p < 0.01); the partial correlation coefficient value reached 0.87. The higher the water discharge rate, the more surface runoff formation was facilitated. (ii) When the slope remained the same, the underground runoff was relatively high at 3 L/min. Given the same discharge, a significant negative correlation between underground runoff and slope was found (p < 0.05); the partial correlation coefficient value reached -0.71. (iii) In response to a water discharge rate of 5 L/min, surface soil erosion was serious, and the maximum sediment transport modulus was 174.088 g/min.m(2). A significant cubic function relationship existed between the scouring time and surface sediment yield. Overall, a critical flow rate occurred between 3 and 5 L/min, which controlled changes in surface runoff, subsurface runoff and surface sediment yield. Under highly concentrated flow, drastic soil erosion could occur. These results can provide a scientific basis for the control and prevention of concentrated flow-induced erosion in karst areas.
英文关键词	Concentrated flow Gently sloping farmland Abandoned farmland Simulation Karst
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000798078800002
WOS关键词	RAINFALL KINETIC-ENERGY ; ROCKY DESERTIFICATION ; SOIL-EROSION ; LOESS PLATEAU ; NORTHWEST GUANGXI ; GUIZHOU PROVINCE ; STEEP HILLSLOPES ; DRIVING FORCES ; LAND-USE ; REGION
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/2XILL650/392106
推荐引用方式 GB/T 7714	Yi, Xingsong,Dai, Quanhou,Yan, Youjin,et al. Effects of concentrated flow changes on runoff conversion and sediment yield in gently sloping farmland in a karst area of SW China[J],2022,215.
APA	Yi, Xingsong.,Dai, Quanhou.,Yan, Youjin.,Yao, Yiwen.,Lu, Yonghuan.,...&Xu, Yusuo.(2022).Effects of concentrated flow changes on runoff conversion and sediment yield in gently sloping farmland in a karst area of SW China.CATENA,215.
MLA	Yi, Xingsong,et al."Effects of concentrated flow changes on runoff conversion and sediment yield in gently sloping farmland in a karst area of SW China".CATENA 215(2022).