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Experimental study on the development of collapse of overhanging layers of gully in Yuanmou Valley, China Original Research Article
Anqiang Chen; Dan Zhang; Hui Peng; Jianrong Fan; Donghong Xiong; Gangcai Liu
Corresponding AuthorGangcai Liu
2013
Source PublicationCATENA
Volume109Pages:177-185
AbstractThe 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.
KeywordScour Hole Collapse Of Overhanging Layers Gully Head Dry Hot Valley
DOI10.1016/j.catena.2013.04.002
Indexed BySCI
Language英语
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/6556
Collection山地灾害与地表过程重点实验室
山地表生过程与生态调控重点实验室
数字山地与遥感应用中心
Recommended Citation
GB/T 7714
Anqiang Chen,Dan Zhang,Hui Peng,et al. Experimental study on the development of collapse of overhanging layers of gully in Yuanmou Valley, China Original Research Article[J]. CATENA,2013,109:177-185.
APA Anqiang Chen,Dan Zhang,Hui Peng,Jianrong Fan,Donghong Xiong,&Gangcai Liu.(2013).Experimental study on the development of collapse of overhanging layers of gully in Yuanmou Valley, China Original Research Article.CATENA,109,177-185.
MLA Anqiang Chen,et al."Experimental study on the development of collapse of overhanging layers of gully in Yuanmou Valley, China Original Research Article".CATENA 109(2013):177-185.
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