Deciphering Landslide Behavior Using Large-scale Flume Experiments

Date
2008-01-01
Authors
Reid, Mark
Iverson, Neal
Iverson, Richard
Iverson, Neal
LaHusen, Richard
Brien, Dianne
Logan, Matthew
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Altmetrics
Authors
Research Projects
Organizational Units
Journal Issue
Series
Department
Geological and Atmospheric Sciences
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.

Description
Keywords
Citation
DOI
Source