Experimental study on the development of collapse of overhanging layers of gully in Yuanmou Valley, China

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Experimental study on the development of collapse of overhanging layers of gully in Yuanmou Valley, China
	Chen, Anqiang 1; Zhang, Dan2 ; Peng, Hui 3; Fan, Jianrong4 ; Xiong, Donghong4 ; Liu, Gangcai4
刊名	CATENA
	2013-10-01
卷号	109 页码:177-185
关键词	Scour hole Collapse of overhanging layers Gully head Dry hot valley
ISSN号	0341-8162
通讯作者	Liu, Gangcai
英文摘要	The collapse of overhanging layers of the heads and sidewalls of gullies accelerates gully development. Thus, the development features of the collapse of overhanging layers must be understood. In this study, the process of collapse of overhanging layers in man-made soil bodies containing different soil layers was investigated by flow scouring experiments. A soil body composed of a lower sandy layer and an upper layer of clay soil was evaluated, and a field soil profile was modelled in a test tank with an open side. The results revealed that the occurrence of the collapse of overhanging layers could be attributed to the development of a scour hole in the open side; the greater the flow rate, the lower the proportion of on-wall runoff. On-wall runoff played a more important role in the development of scour holes than off-wall runoff. The shape of scour holes formed under different flow conditions was similar. Also, the scour hole is not apparently related to the flow rate, implicating that the collapse is more dependent on rainfall (runoff) time rather than rainfall (runoff) intensity in the studied region; this is substantially different from other soil erosion types that are closely related to rainfall intensity. Moreover, the maximum length (S-L) and height (S-H) of the scour holes increased gradually with accumulated flow and scouring time; in addition, the height of the hanging soil body (H-D) gradually decreased, and a linear relationship between SL and HD was observed (H-D = -0.359; S-L + 117.3; R-2 =0.861; P = 0.003). After the seventh scour test, the scour hole triggered the collapse of the upper clay layer. The cantilever model was modified to predict the stability of the overhanging soil body. It provided a satisfactory explanation of the static balance of the weight of the soil as well as the tensile strength. After the seventh scour test, the measured and predicted threshold values of H-D, S-L, and T-C were nearly equal, and a stable balance state was attained. However, when a 10 cm tension crack appeared in the overhanging soil body, a stable balance state was obtained during the sixth scour test. (C) 2013 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences ; Life Sciences & Biomedicine
类目[WOS]	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
研究领域[WOS]	Geology ; Agriculture ; Water Resources
关键词[WOS]	UPLAND CONCENTRATED FLOWS ; SCOUR DOWNSTREAM ; HEADCUT ADVANCE ; RAINFALL INTENSITY ; STRATIFIED SOILS ; EROSION ; MIGRATION ; PRESSURE ; OVERFALL ; STRESS
收录类别	SCI
原文出处	http://ac.els-cdn.com/S0341816213000829/1-s2.0-S0341816213000829-main.pdf?_tid=9a6fdaba-fe94-11e4-8163-00000aacb362&acdnat=1432087672_0b5697109315ada6fbf621a70a6b0c11
语种	英语
WOS记录号	WOS:000321729400018
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/8310]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室成都山地灾害与环境研究所_数字山地与遥感应用中心
作者单位	1.Yunnan Acad Agr Sci, Inst Agr Environm & Resources, Kunming 650205, Peoples R China 2.Yunnan Agr Univ, Coll Resources & Environm, Kunming 650205, Peoples R China 3.Yunnan Acad Agr Sci, Res Inst Trop Ecoagr Sci, Yuanmou 651300, Peoples R China 4.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Chen, Anqiang,Zhang, Dan,Peng, Hui,et al. Experimental study on the development of collapse of overhanging layers of gully in Yuanmou Valley, China[J]. CATENA,2013,109:177-185.
APA	Chen, Anqiang,Zhang, Dan,Peng, Hui,Fan, Jianrong,Xiong, Donghong,&Liu, Gangcai.(2013).Experimental study on the development of collapse of overhanging layers of gully in Yuanmou Valley, China.CATENA,109,177-185.
MLA	Chen, Anqiang,et al."Experimental study on the development of collapse of overhanging layers of gully in Yuanmou Valley, China".CATENA 109(2013):177-185.