Plot-based experimental study of raindrop detachment, interrill wash and erosion-limiting degree on a clayey loessal soil

doi:10.1016/j.jhydrol.2019.06.004

	Plot-based experimental study of raindrop detachment, interrill wash and erosion-limiting degree on a clayey loessal soil
	Zhang, Qingwei 2; Wang, Zhanli 2,5; Guo, Qi 1,5; Tian, Naling 2; Shen, Nan 2; Wu, Bing 3; Liu, Jun'e 4
刊名	JOURNAL OF HYDROLOGY
	2019-08-01
卷号	575 页码:1280-1287
关键词	Simulated rainfall Soil erosion pan Rainfall intensity Slope gradient Interrill erosion process
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2019.06.004
通讯作者	Wang, Zhanli(zwang@nwsuaf.edu.cn)
英文摘要	Better understanding of raindrop detachment, interrill wash and erosion-limiting degree in interrill processes is critical for accurately modelling interrill erosion and implementing proper anti-erosion strategies. Simulated rainfall experiments were conducted on a clayey loessal soil at three rainfall intensities (42, 60 and 90 mm h(-1)), five slope gradients (7 degrees, 10 degrees, 15 degrees, 20 degrees and 25 degrees) and rainfall duration of 40 min. Results showed that raindrop detachment rate initially decreased rapidly within a few minutes and then reached a relative steady state during rainfall. The initial and steady raindrop detachment rate increased with increased rainfall intensity. Interrill wash rate peaked early and then decreased to a relative constant rate during the rainfall. The initial, maximum and steady interrill wash rate increased with increased rainfall intensity and slope gradient. Erosion-limiting degree (ELD), defined as the ratio of interrill wash rate to raindrop detachment rate, ranged from 10.99% to 35.70% under experimental conditions, indicating that interrill erosion system was transport-limited. The ELD decreased with rainfall intensity and increased linearly (R-2 = 0.90) with slope gradient. The higher the rainfall intensity, the stronger the transport-limiting in interrill erosion processes; the steeper the slope gradient, the weaker the transport-limiting in interrill erosion processes. Raindrop detachment is the dominant process in detaching soil particles, whereas interrill flow contributes to washing out detached sediments. The findings of this study, especially ELD, largely improved the understanding of interrill erosion processes.
资助项目	National Key Research and Development Program of China[2017YFD0800502] ; National Natural Science Foundation of China[41830758] ; National Natural Science Foundation of China[41601282] ; National Natural Science Foundation of China[41471230] ; National Natural Science Foundation of China[41171227] ; Special-Funds of Scientific Research Programs of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau[A314021403-C2]
WOS关键词	PARTICLE-SIZE DISTRIBUTION ; SLOPE GRADIENT ; RAINFALL INTENSITY ; SEDIMENT SIZE ; STEEP SLOPES ; DROP-SIZE ; SPLASH ; TRANSPORT ; DYNAMICS ; IMPACT
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000488143000100
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Special-Funds of Scientific Research Programs of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/129854]
专题	中国科学院地理科学与资源研究所
通讯作者	Wang, Zhanli
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, 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.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Dept Civil Engn, Xian 710049, Shaanxi, Peoples R China 4.Shaanxi Normal Univ, Sch Geog & Tourism, Xian 710119, Shaanxi, Peoples R China 5.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qingwei,Wang, Zhanli,Guo, Qi,et al. Plot-based experimental study of raindrop detachment, interrill wash and erosion-limiting degree on a clayey loessal soil[J]. JOURNAL OF HYDROLOGY,2019,575:1280-1287.
APA	Zhang, Qingwei.,Wang, Zhanli.,Guo, Qi.,Tian, Naling.,Shen, Nan.,...&Liu, Jun'e.(2019).Plot-based experimental study of raindrop detachment, interrill wash and erosion-limiting degree on a clayey loessal soil.JOURNAL OF HYDROLOGY,575,1280-1287.
MLA	Zhang, Qingwei,et al."Plot-based experimental study of raindrop detachment, interrill wash and erosion-limiting degree on a clayey loessal soil".JOURNAL OF HYDROLOGY 575(2019):1280-1287.