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A model for spatially and temporally distributed shallow landslide initiation by rainfall infiltration

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, , and
Edited by:
Rickenmann D.Chen C.L.

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Abstract

We describe a model for regional initiation of shallow landslides based on an approximate analytic solution to Richards equation combined with an infinite-slope calculation. The model applied over digital topography computes pressure heads and factors of safety as functions of depth for geographic information system (GIS) grid cells at any time during and after rainfall events. An example is presented that simulates the progressive development of shallow landslides on steep slopes during a rainfall event. This example shows how this modeling provides insights into transient rainfall-caused processes that trigger shallow slope instability and consequent regionally distributed debris-flow events. Specifically, we infer that the spatial pattern of instability is primarily controlled by topography, while intensity and duration of rainfall, and the subsequent pore-pressure responses control the temporal pattern of instability. ?? 2003 Millpress.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
A model for spatially and temporally distributed shallow landslide initiation by rainfall infiltration
Volume
1
Year Published:
2003
Language:
English
Larger Work Title:
International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings
First page:
179
Last page:
187
Conference Title:
3rd International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment
Conference Location:
Davos
Conference Date:
10 September 2003 through 12 September 2003