2004 UC Proceedings Abstract
GIS-Based Assessment of Post-Wildfire Debris-Flow Hazards, Southern California Track: Water Resources Author(s): Susan Cannon, John Michael Debris flows can be one of the most hazardous consequences of rainfall on recently burned hillslopes. Empirical models developed to estimate the probability of post-wildfire debris-flow activity and the magnitude of the response are implemented on a GIS platform to generate a series of debris-flow hazard maps following the extensive wildfires in October 2003 in Southern California. The probability maps are based on the application of a logistic multiple regression model that describes the percent chance of debris-flow production from an individual basin as a function of burned extent, soil properties, basin gradients, and storm rainfall. The peak discharge maps are based on application of a multiple-regression model that estimates debris-flow peak discharge at a basin outlet as a function of basin gradient, burn extent, and storm rainfall. These maps identify those basins that are most prone to the largest debris-flow events and provide information for evacuation planning. Susan Cannon U.S. Geological Survey Geologic Hazards Team Box 25046 DFC, MS 966 Denver , CO 80225 US Phone: 303.273.8604 E-mail: cannon@usgs.gov John Michael U.S. Geological Survey Box 25046, DFC, MS 966 Denver , CO 80225 US Phone: 303.273.8562 E-mail: jmichael@usgs.gov |
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