干旱区生态环境知识资源中心(Arid): Morphological development of drying shrinkage cracks at the rock-soil - soil interface in a karst rocky desertification area

Arid

DOI	10.1016/j.ejrh.2024.101894
	Morphological development of drying shrinkage cracks at the rock-soil - soil interface in a karst rocky desertification area
	Peng, Xudong; Li, Changlan; Dai, Quanhou; Xu, Shengbing; Zang, Jun
通讯作者	Peng, XD
来源期刊	JOURNAL OF HYDROLOGY-REGIONAL STUDIES
EISSN	2214-5818
出版年	2024
卷号	54
英文摘要	Study region: karst rocky desertification area, China Study focus: The rock-soil interface, where exposed bedrock is in abrupt contact with the soil, is prevalent in rocky desertification areas. As a constraining boundary condition of soils, drying shrinkage cracks are easily developed at the rock-soil interface of outcrops with weak or unweathered bedrock, but the shrinkage crack development under these conditions is still unknown, which seriously restricts a profound understanding of the hydrological processes on karst slopes with exposed bedrocks. This study aims to quantify the geometric morphological characteristics of these shrinkage cracks and the block areas cut by the crack network during the crack development, as well as to explore the development of drying shrinkage cracks at the rock-soil interface of outcrops. New hydrological insights: When the soil moisture content was between 24.1 % and 28.6 %, shrinkage cracks at the rock-soil interface (CRSI) first formed along the border between rocks and soils and then at the soil surface perpendicular to the former, most of the cracks intersected vertically in shapes of T or +. The geometric parameters of shrinkage cracks initially increased before stabilizing and reached a stabilization stage as soon as the moisture content decreased. However, all of them finally shrank slightly in the later stages of soil water loss in thicker soils. Soil thickness was not a crucial factor affecting the CRSI formation. The CRSI were 1.2 times wider than all other cracks, while being infrequent and making up just 40 % of the total length and area of all cracks. As a result, the CRSI may grow into a key pathway for the establishment of preferred flow at the rock-soil interface, which should be paid attention in the hydrological processes in the karst rocky desertification region.
英文关键词	Shrinkage cracks Rock-soil interface Image processing Outcrops Rocky desertification
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001274598200001
WOS关键词	PREFERENTIAL FLOW ; CLAY SOIL ; INFILTRATION ; WATER ; BEHAVIOR ; EPIKARST ; SIMULATION ; TRANSPORT ; MOISTURE ; IMPACTS
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404633
推荐引用方式 GB/T 7714	Peng, Xudong,Li, Changlan,Dai, Quanhou,et al. Morphological development of drying shrinkage cracks at the rock-soil - soil interface in a karst rocky desertification area[J],2024,54.
APA	Peng, Xudong,Li, Changlan,Dai, Quanhou,Xu, Shengbing,&Zang, Jun.(2024).Morphological development of drying shrinkage cracks at the rock-soil - soil interface in a karst rocky desertification area.JOURNAL OF HYDROLOGY-REGIONAL STUDIES,54.
MLA	Peng, Xudong,et al."Morphological development of drying shrinkage cracks at the rock-soil - soil interface in a karst rocky desertification area".JOURNAL OF HYDROLOGY-REGIONAL STUDIES 54(2024).