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(Article of periodic en Anglais - 2013)

Document title

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

Authors(s) and Affiliation(s)

CHEN A. (1) ; ZHANG D. (2) ; PENG H. (3) ; FAN J. (4) ; XIONG D. (4) ; LIU G. (4) ;
(1) Inst. of Agricultural Environment and Resources, Yunnan Academy of Agricultural Science, Kunming, CHINE
(2) College of Resources and Environment, Yunnan Agricultural Univ., Kunming, CHINE
(3) Research Inst. of Tropical Eco-agricultural Science, Yunnan Academy of Agricultural Sciences, Yuanmou, CHINE
(4) Key Lab. of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, CHINE

Abstract

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. 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.

Source

Article of periodic

published at : Catena / ISSN 0341-8162

Editor : Catena, Cremlingen-Destedt - ALLEMAGNE (1973)

Millesime : 2013, vol. 109 [pp. 177-185]

Bibliographic references : 1 p.

Collation : 8 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2013.04.002

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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