Campus Units

Geological and Atmospheric Sciences

Document Type

Conference Proceeding

Publication Version

Published Version

Publication Date

2008

Journal or Book Title

Proceedings of the First World Landslide Forum

First Page

497

Last Page

500

Conference Title

The First World Landslide Forum

Conference Date

November 18-21, 2008

City

Tokyo, Japan

Abstract

Landslides can be triggered by a variety of hydrologic events and they can exhibit a wide range of movement dynamics. Effective prediction requires understanding these diverse behaviors. Precise evaluation in the field is difficult; as an alternative we performed a series of landslide initiation experiments in the large-scale, USGS debris-flow flume. We systematically investigated the effects of three different hydrologic triggering mechanisms, including groundwater exfiltration from bedrock, prolonged rainfall infiltration, and intense bursts of rain. We also examined the effects of initial soil porosity (loose or dense) relative to the soil’s critical-state porosity. Results show that all three hydrologic mechanisms can instigate landsliding, but water pathways, sensor response patterns, and times to failure differ. Initial soil porosity has a profound influence on landslide movement behavior. Experiments using loose soil show rapid soil contraction during failure, with elevated pore pressures liquefying the sediment and creating fast-moving debris flows. In contrast, dense soil dilated upon shearing, resulting in slow, gradual, and episodic motion. These results have fundamental implications for forecasting landslide behavior and developing effective warning systems.

Comments

This proceeding is published as Reid, Mark E., Richard M. Iverson, Neal R. Iverson, Richard G. LaHusen, Dianne L. Brien, and Matthew Logan. "Deciphering Landslide Behavior Using Large-scale Flume Experiments."In Proceedings of the First World Landslide Forum. The First World Landslide Forum. Tokyo, Japan. November 18-21, 2008.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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