干旱区生态环境知识资源中心(Arid): Temporal variations in rainfall, runoff and sediment yield in small karst watersheds

Arid

DOI	10.1016/j.catena.2023.107292
	Temporal variations in rainfall, runoff and sediment yield in small karst watersheds
	Sun, Mingwei; Wang, Zhongcheng; Li, Zhenwei; Xu, Xianli; Qin, Li; Song, Tao
通讯作者	Li, ZW
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2023
卷号	231
英文摘要	As one of the largest and most typical continuous karst distribution belts in the world, Southwest China is vulnerable to soil erosion and rocky desertification because of its unique geological conditions and heterogeneous landscapes. Understanding the rainfall-runoff-sediment transport relationships is critical to effectively controlling soil erosion in karst watersheds. This study aims to evaluate the sediment yield variability at different temporal scales (daily, monthly/seasonal, and annual) from 2014 to 2019 and to further identify the rainfall and runoff variables most associated with sediment yield in the selected Mahuangtian (2.26 km2) and Muzhaihe (0.09 km2) karst watersheds. Since rainfall and runoff variables were highly codependent, the partial least squares regression (PLSR) model was used to quantify the relative importance of rainfall and runoff variables to sediment yield. The variable importance of the projection (VIP) scores>1 was considered to be the most influential predictor of the PLSR model. Results showed that sediment yield was greatly influenced by rainfall and runoff, which can explain 70% and 85% of the variation of sediment yield in the Mahuangtian and Muzhaihe watersheds, respectively. For rainfall variables, three-day antecedent precipitation (VIP = 1.41) and five-day antecedent precipitation (VIP = 1.28) were the main first-order factors controlling sediment yield in the Mahuangtian watershed. In contrast, the rainfall amount (VIP = 1.35) was the dominant factor influencing sediment yield in the Muzhaihe watershed. For runoff variables, runoff amount, runoff coefficient, and maximum discharge were the primary variables controlling the sediment yield in these two karst watersheds. By partially eliminating the co-dependency of the variables, the PLSR approach can conveniently determine the dominant factors controlling sediment yield in heterogeneous karst watersheds.
英文关键词	Soil erosion Rainfall Runoff Sediment transport Partial least squares regression
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001023060000001
WOS关键词	SOIL-EROSION ; HYDROLOGICAL RESPONSE ; TOTAL PHOSPHORUS ; LAND-USE ; RIVER ; CATCHMENT ; TRANSPORT ; DISCHARGE ; INTENSITY ; LITHOLOGY
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/2XILL650/395703
推荐引用方式 GB/T 7714	Sun, Mingwei,Wang, Zhongcheng,Li, Zhenwei,et al. Temporal variations in rainfall, runoff and sediment yield in small karst watersheds[J],2023,231.
APA	Sun, Mingwei,Wang, Zhongcheng,Li, Zhenwei,Xu, Xianli,Qin, Li,&Song, Tao.(2023).Temporal variations in rainfall, runoff and sediment yield in small karst watersheds.CATENA,231.
MLA	Sun, Mingwei,et al."Temporal variations in rainfall, runoff and sediment yield in small karst watersheds".CATENA 231(2023).