Effect of rock fragment content on erosion processes of disturbed soil accumulation under field scouring conditions

doi:10.1007/s11368-018-2200-3

	Effect of rock fragment content on erosion processes of disturbed soil accumulation under field scouring conditions
	Niu, Yaobin 1; Gao, Zhaoliang 1,2; Li, Yonghong 3; Luo, Ke 4
刊名	JOURNAL OF SOILS AND SEDIMENTS
	2019-04-01
卷号	19 期号:4 页码:1708-1723
关键词	Disturbed soil accumulation Erosion process Hydraulic characteristics Production and construction projects Rock fragment content
ISSN号	1439-0108
DOI	10.1007/s11368-018-2200-3
通讯作者	Gao, Zhaoliang(gzl@ms.iswc.ac.cn)
英文摘要	Purpose Soil and water erosion from high rock fragment content disturbed soil accumulation severely threatens ecological security. Evaluation of the quantitative influence of rock fragment content on soil erosion processes was the basic research for soil and water conservation. Materials and methods Field simulation scouring experiments were conducted on the disturbed soil accumulation experimental plot. A 10x1-m(2) plot with 28 gradients was established on Changwu Experimental Station in the Loess Plateau, China. Tap water was applied at the top of the plot with the four different flow discharge rates of 1.3x10(-4), 1.7x10(-4), 2.1x10(-4) and 2.5x10(-4)m(3)s(-1) to simulate surface runoff processes. The experimental plots underlying surfaces were filled with different rock fragment content of 20%, 40% and 0%. The soil used in these experimental plots was a silty loam from the disturbed soil accumulation formed by expressway construction in the loess plateau areas. The disturbed soil accumulation site was located near the G70 Fujian-Yinchuan expressway and the vegetation cover was very low. The mean diameter of rock fragments was 22 mm in these experiments, and the rock fragments were unsmooth, angular crushed stone taken from the quarry in the Changwu County. Results and discussion The results showed that rock fragment content of 20% and 40% could significantly decreased runoff and sediment (P<0.05), although there was no significantly different between 20 and 40%. The rock fragments decreased mean flow velocity by 43 to 55% in mean flow velocity compared to the pure soil. Furthermore, the flow was laminar flow in the rock fragments slope. The rock fragments significantly decreased flow shear stress (52-89%), stream power (63-89%), unit stream power (41-59%), runoff kinetic energy (67-88%) and unit energy of the water-carrying section (81-89%) compared with the pure soil. With increased rock fragment content, the rill erodibility decreased. The rill erodibility was estimated to be 1.4x10(-3)sm(-1), 0.7x10(-3)sm(-1) and 0.5x10(-3)sm(-1), under the condition of pure soil, rock fragment content of 20% and 40%, respectively. Conclusions Low rock fragment content (<40%) in disturbed soil accumulation significantly decreased runoff and sediment. With the rock fragment content increased, the rill erodibility was decreased. Appropriate rock fragment content could be used to control soil erosion on disturbed soil accumulation in practice. The important parameters from this study will be helpful for disturbed soil accumulation erosion prediction model establishment.
资助项目	National Natural Science Foundation of China[41671283] ; State Key Development Programme for Basic Research of China[2016YFC0501706-02]
WOS关键词	CONCENTRATED FLOW EROSION ; RUNOFF ; WATER ; CONSTRUCTION ; DYNAMICS ; OVERLAND ; RATES ; INFILTRATION ; SURFACES ; VELOCITY
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000462500000010
资助机构	National Natural Science Foundation of China ; State Key Development Programme for Basic Research of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/48677]
专题	中国科学院地理科学与资源研究所
通讯作者	Gao, Zhaoliang
作者单位	1.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 3.Northwest A&F Univ, Coll Water Resources & Architectural Engn, Yangling 712100, Shaanxi, Peoples R China 4.Soil & Water Conservat Control Bur, Jin Shan Meng Adjacent Area, YRCC, Yulin 719000, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Niu, Yaobin,Gao, Zhaoliang,Li, Yonghong,et al. Effect of rock fragment content on erosion processes of disturbed soil accumulation under field scouring conditions[J]. JOURNAL OF SOILS AND SEDIMENTS,2019,19(4):1708-1723.
APA	Niu, Yaobin,Gao, Zhaoliang,Li, Yonghong,&Luo, Ke.(2019).Effect of rock fragment content on erosion processes of disturbed soil accumulation under field scouring conditions.JOURNAL OF SOILS AND SEDIMENTS,19(4),1708-1723.
MLA	Niu, Yaobin,et al."Effect of rock fragment content on erosion processes of disturbed soil accumulation under field scouring conditions".JOURNAL OF SOILS AND SEDIMENTS 19.4(2019):1708-1723.