干旱区生态环境知识资源中心(Arid): Characteristics and dynamic mechanism of rill erosion driven by extreme rainfall on karst plateau slopes, SW China

Arid

DOI	10.1016/j.catena.2024.107890
	Characteristics and dynamic mechanism of rill erosion driven by extreme rainfall on karst plateau slopes, SW China
	Yan, Youjin; Tu, Na; Cen, Longpei; Gan, Fengling; Dai, Quanhou; Mei, Lina
通讯作者	Mei, LA
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2024
卷号	238
英文摘要	Driven by climate change and increased human activities, the frequency and intensity of extreme rainfall events are increasing, leading to increased risk of water erosion on slopes in karst rocky desertification (KRD) areas. However, the driving factors (rainfall intensity, slope gradient, and the degree of underground fissure pore), characteristics, and dynamic mechanisms of rill erosion on KRD slopes under extreme rainfall have received limited attention. A rainfall simulation experiment was performed to investigate the driving factors of rill erosion on KRD slopes under extreme rainfall events. The experiments were conducted using an erosion flume (4 m long, 1.5 m wide and 0.35 m deep) with five rainfall intensities (50, 105, 115, 125 and 145 mmh(-1)), three-level slope gradients (5 degrees, 15 degrees and 25 degrees), and three typical degrees of underground pore fissure (1 %, 3 % and 5 %). The results showed that extreme rainfall significantly stimulated the formation and development of rill erosion on KRD slopes. In particular, rainfall intensity and slope gradient significantly affected rill erosion (p < 0.05), whereas the degree of underground pore fissure did not have any distinct effect. Increasing rainfall intensity intensified rill erosion by significantly (p < 0.05) promoting the rill density, total rill surface area, and longest of rill length. With increasing slope gradient, the rill density, rill distribution density, and average rill depth significantly increased (p < 0.05). Moreover, extreme rainfall events exacerbated surface soil erosion by enhancing the hydrodynamic characteristics of slope runoff. Rill erosion was most sensitive to the shear stress of runoff, and rill density was found to be the most suitable rill index for describing surface soil erosion on the slope under extreme rainfall. The findings provide valuable insights into the characteristics and mechanisms of soil erosion in karst regions under future climate warming.
英文关键词	Rill erosion Extreme rainfall Hydrodynamic characteristic Dynamic mechanism Karst rocky desertification
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001198046500001
WOS关键词	SOIL-EROSION ; SURFACE-ROUGHNESS ; ROCKY DESERTIFICATION ; GULLY EROSION ; BARE SLOPES ; INTENSITY ; SEDIMENT ; RUNOFF ; DETACHMENT ; FLOW
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/2XILL650/403136
推荐引用方式 GB/T 7714	Yan, Youjin,Tu, Na,Cen, Longpei,et al. Characteristics and dynamic mechanism of rill erosion driven by extreme rainfall on karst plateau slopes, SW China[J],2024,238.
APA	Yan, Youjin,Tu, Na,Cen, Longpei,Gan, Fengling,Dai, Quanhou,&Mei, Lina.(2024).Characteristics and dynamic mechanism of rill erosion driven by extreme rainfall on karst plateau slopes, SW China.CATENA,238.
MLA	Yan, Youjin,et al."Characteristics and dynamic mechanism of rill erosion driven by extreme rainfall on karst plateau slopes, SW China".CATENA 238(2024).