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Automated, reproducible delineation of zones at risk from inundation by large volcanic debris flows

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Abstract

Large debris flows can pose hazards to people and property downstream from volcanoes. We have developed a rapid, reproducible, objective, and inexpensive method to delineate distal debris-flow hazard zones. Our method employs the results of scaling and statistical analyses of the geometry of volcanic debris flows (lahars) to predict inundated valley cross-sectional areas (A) and planimetric areas (B) as functions of lahar volume. We use a range of specified lahar volumes to evaluate A and B. In a Geographic Information System (GIS) we employ the resulting range of predicted A and B to delineate gradations in inundation hazard, which is highest near the volcano and along valley thalwegs and diminishes as distances from the volcano and elevations above valley floors increase. Comparison of our computer-generated hazard maps with those constructed using traditional, field-based methods indicates that our method can provide an accurate means of delineating lahar hazard zones.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Automated, reproducible delineation of zones at risk from inundation by large volcanic debris flows
Year Published:
1997
Language:
English
Publisher:
ASCE
Publisher location:
New York, NY, United States
First page:
176
Last page:
186
Number of Pages:
11
Conference Title:
Proceedings of the 1997 1st International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment
Conference Location:
San Francisco, CA, USA
Conference Date:
7 August 1997 through 9 August 1997