干旱区生态环境知识资源中心(Arid): Suspended sediment dynamics and linking with watershed surface characteristics in a karst region

Arid

DOI	10.1016/j.jhydrol.2024.130719
	Suspended sediment dynamics and linking with watershed surface characteristics in a karst region
	Xiao, Linlv; Li, Rui; Jing, Jun; Yuan, Jiang; Tang, Zhengyi
通讯作者	Li, R
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2024
卷号	630
英文摘要	The source and transport processes of suspended sediment are issues that require further study. The complex relationship between the integrated surface characteristics and the mechanisms of sediment sources and transport in heterogeneous karst watersheds remains unclear. This study proposes a comprehensive assessment framework for sediment sources that combines the surface characteristics of karst watersheds, such as exposed rock and shallow topsoil in karst areas. Additionally, the Karst Surface Characteristic Index (KSCI) is developed to evaluate the potential supply capacity of sediment in karst watersheds. The hysteresis index (HImid) is calculated using a long series of hydrological data to study runoff and sediment relationships in eight watersheds in the karst region of southern China. Results indicated that plan curvature, terrain relief, NDVI, and rock exposure contributed most to KSCI, with these four factors contributing 65%. The Q -SSC hysteresis analysis results based on 445 hydrological events showed that a clockwise hysteresis pattern was the most frequent and efficient pattern of sediment transport in the studied watershed (clockwise hysteresis pattern accounted for 72.3% of 445 hydrological events) owing to the limited sediment supply in the karst watersheds. The quantitative analysis results of HImid and KSCI showed that HImid was closely related to KSCI. With an increase in KSCI, a clockwise hysteresis pattern was more likely to appear, indicating that watershed characteristics exerted a significant influence on sediment transport velocity and efficiency. In terms of spatial distribution, near the outlet of the watershed or the river channel, high KSCI values were distributed, and clockwise hysteresis was more likely to occur. In contrast, at the far end of the watershed outlet or the river channel, high values of KSCI were distributed, and anticlockwise hysteresis was more likely to occur. Our findings further enrich the theory of soil erosion and the runoff -sediment relationship at the watershed scale in karst areas, and serve as valuable decisionmaking references for integrated water and soil sources management.
英文关键词	Hysteresis index Karst watersheds Sediment source Karst Surface Characteristic Index Karst desertification
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001176617300001
WOS关键词	DISCHARGE HYSTERESIS ; LOESS PLATEAU ; SOIL-EROSION ; PATTERNS ; CATCHMENT ; LANDSCAPE ; LITHOLOGY ; YIELD ; RIVER ; GIS
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404550
推荐引用方式 GB/T 7714	Xiao, Linlv,Li, Rui,Jing, Jun,et al. Suspended sediment dynamics and linking with watershed surface characteristics in a karst region[J],2024,630.
APA	Xiao, Linlv,Li, Rui,Jing, Jun,Yuan, Jiang,&Tang, Zhengyi.(2024).Suspended sediment dynamics and linking with watershed surface characteristics in a karst region.JOURNAL OF HYDROLOGY,630.
MLA	Xiao, Linlv,et al."Suspended sediment dynamics and linking with watershed surface characteristics in a karst region".JOURNAL OF HYDROLOGY 630(2024).