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Environmental Earth Sciences

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01.06.2015 | Original Article

Research on loess flow-slides induced by rainfall in July 2013 in Yan’an, NW China

verfasst von: Genlong Wang, Tonglu Li, Xianli Xing, Yu Zou

Erschienen in: Environmental Earth Sciences | Ausgabe 12/2015

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Abstract

The Yan’an area, located on the Loess Plateau in Northern Shaanxi Province, China, experienced heavy and prolonged rainfall in July 2013, which induced 8,135 slope failures (loess landslides and loess flow-slides), destroying approximately 10,000 cave dwellings and killing 45 people. Field investigations have indicated that the occurrence of loess flow-slides is closely related to infiltration depth, slope angle, slope morphology, rainfall intensity, and loess strength. The results from this study showed that (a) most of the loess flow-slides in Yan’an were small scale, ranging in volume from tens of cubic meters to hundreds of cubic meters; (b) the loess flow-slides only occurred at a depth of <2 m, corresponding to a surface layer of completely saturated loess; (c) most slope failures of loess flow-slides occurred on loess slopes with angles between 35° and 50°; and (d) a reduction in the soil strength of saturated loess was a primary cause of the occurrence of loess flow-slides. However, tree roots may reinforce deeper soil mass (>2 m) and can effectively prevent loess flow-slides.

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Titel: Research on loess flow-slides induced by rainfall in July 2013 in Yan’an, NW China
verfasst von: Genlong Wang
Tonglu Li
Xianli Xing
Yu Zou
Publikationsdatum: 01.06.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 12/2015
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-014-3951-9

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