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      Observations and Analyses of the 9 January 2018 Debris-Flow Disaster, Santa Barbara County, California

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          ABSTRACT

          The post–Thomas Fire debris flows of 9 January 2018 killed 23 people, damaged 558 structures, and caused severe damage to infrastructure in Montecito and Carpinteria, CA. U.S. Highway 101 was closed for 13 days, significantly impacting transportation and commerce in the region. A narrow cold frontal rain band generated extreme rainfall rates within the western burn area, triggering runoff-driven debris flows that inundated 5.6 km2 of coastal land in eastern Santa Barbara County. Collectively, this series of debris flows is comparable in magnitude to the largest documented post-fire debris flows in the state and cost over a billion dollars in debris removal and damages to homes and infrastructure. This study summarizes observations and analyses on the extent and magnitude of inundation areas, debris-flow velocity and volume, and sources of debris-flow material on the south flank of the Santa Ynez Mountains. Additionally, we describe the atmospheric conditions that generated intense rainfall and use precipitation data to compare debris-flow source areas with spatially associated peak 15 minute rainfall amounts. We then couple the physical characterization of the event with a compilation of debris-flow damages to summarize economic impacts.

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          Observed impacts of anthropogenic climate change on wildfire in California

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            The physics of debris flows

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              Initial hydrologic and geomorphic response following a wildfire in the Colorado Front Range

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                Author and article information

                Journal
                Environmental and Engineering Geoscience
                GeoScienceWorld
                1078-7275
                February 01 2021
                February 01 2021
                : 27
                : 1
                : 3-27
                Affiliations
                [1 ]California Geological Survey, 801 K Street, Sacramento, CA 95820
                [2 ]California Geological Survey, 320 West 4th Street, Suite 850, Los Angeles, CA 90013
                [3 ]Center for Western Weather and Water Extremes, Scripps Institution of Oceanography, 9500 Gilman Drive, La Jolla, CA 92093
                [4 ]California Geological Survey, 6105 Airport Road, Redding, CA 96002
                [5 ]U.S. Forest Service, 1190 East Ojai Avenue, Ojai, CA 93023
                Article
                10.2113/EEG-D-20-00015
                ea6dd0a8-f0f9-41fe-8e7f-123541c1412c
                © 2021
                History

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