期刊
ENGINEERING GEOLOGY
卷 195, 期 -, 页码 122-134出版社
ELSEVIER
DOI: 10.1016/j.enggeo.2015.05.027
关键词
Landslide; Risk analysis; Slope stability; Earthquake; Rainfall infiltration; Runout analysis
资金
- Sichuan Department of Transportation and Communications
- National Natural Science Foundation of China [51129902]
- Research Grants Council of Hong Kong SAR [16212514]
A storm can trigger numerous shallow landslides on hilly terrains. This paper presents a distributed cell model for presenting regional shallow landslide movement on a three-dimensional digital terrain. The model consists of five components; namely, a digital terrain module, a spatial rainfall distribution module, an infiltration analysis module, a slope stability evaluation module, and a movement prediction module. The locations and volumes of landslides are analyzed first through rainfall infiltration and slope stability analyses. The detached material is assumed to move along the steepest path from one cell to a lower cell. Empirical equations that are developed based on local landslide inventories are adopted as a landslide movement cessation criterion. The effect of landslide size on travel distance is considered by grouping unstable cells that are bounded at least at one side or corner. The uncertainties in soil shear strength parameters and the landslide movement process are considered in determining the possible bounds of travel distance. The movement analysis method is applied to a 164.5 km(2) hilly terrain in the Wenchuan earthquake zone to test its performance in presenting regional shallow landslide movement. The method predicts the volume of landslides reasonably well. The observed and computed movement traces and deposition locations of the detached material also agree reasonably well. The volume of individual landslide and travel distance may be substantially underestimated if the size effect is not considered. (C) 2015 Elsevier B.V. All rights reserved.
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