The Impact and Control of Atmospheric Precipitation on the Formation of Loess Landslides——An Example of Longxi Loess Plateau in Gansu Province
详细信息
- 责任者：Ding Hongwei (Institute of Hydrogeoloical and Engineering Geology ; Gansu Provincical Bureau of Geology and Mineral Exploitation and Development ; Zhangye 734000 ; China) ; Li Li
- 刊名：Gansu Geology
- 出版年：2013
- 卷期：22(1)
- 关键词：滑坡 ; landslides ; 甘肃 ; Gansu Province
- 页码：p.55-60
- 图表：illus., 12 refs.
- 分类号：1800
- issnNo：ISSN1004-4116
- isbnNo：CN 62-1191/P
摘要
This article based on field survey data and summary analysis the landslide type and characteristics of the Longxi Loess Plateau in Gansu Province,to elaborate the formation mechanism of loess landslides from four aspects which include precipitation(mainly referring to the heavy rain or overcast and rainy) change the topography,change the landslide composition、change the landslide soil structure、change the landslide mechanical strength.Precipitation has a greater influence and control on loess landslide in time and space distribution;In fact,there has a good correlation between the strength of landslide frequency and years of precipitation in the same area,in wet years,the number of landslide is more and the scale is larger than dry years.In the same years,the landslide concentrated in March and June to September,the former case is due to seasonal freezing-melting role,while the latter case is the concentration of precipitation in a short time to determine the occurrence of landslide frequency is intensive.In different regions,If there has a similar condition of topography,stratigraphy of lithology and vegetation coverage,the more the rainfall,the higher the landslide frequency occurs,and vice versa.
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