Quantification of upslope and lateral inflow impacts on runoff discharge and soil loss in ephemeral gully systems under laboratory conditions

doi:10.1016/j.jhydrol.2019.124174

	Quantification of upslope and lateral inflow impacts on runoff discharge and soil loss in ephemeral gully systems under laboratory conditions
	Xu, Ximeng 1,2; Zheng, Fenli 2,3,4; Wilson, Glenn V.5; Zhang, Xunchang J.6; Qin, Chao 7; He, Xu 2
刊名	JOURNAL OF HYDROLOGY
	2019-12-01
卷号	579 页码:13
关键词	Ephemeral gully tributaries Flow hydrodynamics Concentrated flow Rill erosion Flow path Soil texture
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2019.124174
通讯作者	Zheng, Fenli(flzh@ms.iswc.ac.cn)
英文摘要	Overland flow through an ephemeral gully (EG) system integrates flow from upslope areas and lateral side slopes. Lateral overland inflow creates tributaries to the main EG channel for runoff and sediment discharge which exacerbates the EG erosion and local soil degradation. However, research concerning tributary formation by overland flow, especially contributions of overland upslope and lateral inflows to EG erosion, are still lacking. Thus, simulated rainfall and inflow experiments under two erosive rainfall intensities (50 and 100 mm h(-1)) and two typical slope gradients (15 degrees and 20 degrees) were conducted under representative lateral and upslope overland inflow conditions using an 8-m long, 2-m wide and 0.6-m deep soil pan. The results showed that upslope and lateral inflow both contributed to the runoff connectivity of the EG channel and lateral rills in the EG system. For these simulated conditions, upslope inflow contributions to total runoff and soil loss were 62-78% and 65-81%, respectively, while lateral inflow only contributed around 10%. The contribution differences could be attributed to flow hydrodynamic characteristics in that shear stress and stream power in the EG channel were 4.9-8.6 times greater than those on the lateral slopes. Lateral inflow was important to lateral rill formation, which contributed to imbricated landform and lateral gradient formation process, and consequently promoted runoff and sediment connectivity of the EG system. Soil erosion induced by concentrated flow in channels and sheet flow in interill areas coarsened soil textures, soil particles lager than 0.02 min increased 12.6% on average, which may contribute to reduction of local soil productivity. This work demonstrates the critical need of preventing both upslope and lateral drainage into EG channels.
资助项目	National Key R&D Program of China[2016YFE0202900] ; National Natural Science Foundation of China[41571263] ; External Cooperation Program of Chinese Academy of Sciences[161461KYSB20170013]
WOS关键词	EROSION PROCESSES ; LOESS PLATEAU ; SIZE-SELECTIVITY ; ERODED SEDIMENT ; DETACHMENT ; FLOW ; HIGHLANDS ; REGION ; DEGRADATION ; HILLSLOPES
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000500371200071
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; External Cooperation Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/130390]
专题	中国科学院地理科学与资源研究所
通讯作者	Zheng, Fenli
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 4.MWR, Yangling 712100, Shaanxi, Peoples R China 5.USDA ARS, Natl Sedimentat Lab, Oxford, MS 38655 USA 6.USDA ARS, Grazinglands Res Lab, El Reno, OK 73036 USA 7.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Xu, Ximeng,Zheng, Fenli,Wilson, Glenn V.,et al. Quantification of upslope and lateral inflow impacts on runoff discharge and soil loss in ephemeral gully systems under laboratory conditions[J]. JOURNAL OF HYDROLOGY,2019,579:13.
APA	Xu, Ximeng,Zheng, Fenli,Wilson, Glenn V.,Zhang, Xunchang J.,Qin, Chao,&He, Xu.(2019).Quantification of upslope and lateral inflow impacts on runoff discharge and soil loss in ephemeral gully systems under laboratory conditions.JOURNAL OF HYDROLOGY,579,13.
MLA	Xu, Ximeng,et al."Quantification of upslope and lateral inflow impacts on runoff discharge and soil loss in ephemeral gully systems under laboratory conditions".JOURNAL OF HYDROLOGY 579(2019):13.