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Measuring historical flooding and erosion in Goodnews Bay using datasets commonly available to Alaska communities

Richard M. Buzard, Christopher V. Maio, David Verbyla, Nicole E.M. Kinsman, and Jacquelyn R. Overbeck, 2020. “Measuring historical flooding and erosion in Goodnews Bay using datasets commonly available to Alaska communities”, Shore & Beach, 88(3), 3-13

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http://doi.org/10.34237/1008831

Measuring historical flooding and erosion in Goodnews Bay using datasets commonly available to Alaska communities
Richard M. Buzard*(1), Christopher V. Maio(1), David Verbyla(2), Nicole E.M. Kinsman (3), and Jacquelyn R. Overbeck (4)
1) University of Alaska Fairbanks, Department of Geosciences, P.O. Box 755940, Fairbanks, AK 99775, USA; rmbuzard@alaska.edu
2) University of Alaska Fairbanks, School of Natural Resources and Extension, P.O. Box 757200, Fairbanks, AK 99775
3) National Oceanic and Atmospheric Administration, National Geodetic Survey, 222 West 7th Avenue, Suite 23, Anchorage, AK 99513
4) Department of Natural Resources, Alaska Division of Geological & Geophysical Surveys, Coastal Hazards Program, 3651 Penland Parkway, Anchorage, AK 99508

Coastal hazards are of increasing concern to many of Alaska’s rural communities, yet quantitative assessments remain absent over much of the coast. To demonstrate how to fill this critical information gap, an erosion and flood analysis was conducted for Goodnews Bay using an assortment of datasets that are commonly available to Alaska coastal communities. Measurements made from orthorectified aerial imagery from 1957 to 2016 show the shoreline eroded 0 to 15.6 m at a rate that posed no immediate risk to current infrastructure. Storm surge flood risk was assessed using a combination of written accounts, photographs of storm impacts, GNSS measurements, hindcast weather models, and a digital surface model. Eight past storms caused minor to major flooding. Wave impact hour calculations showed that the record storm in 2011 doubled the typical annual wave impact hours. Areas at risk of erosion and flooding in Goodnews Bay were identified using publicly available datasets common to Alaska coastal communities; this work demonstrates that the data and tools exist to perform quantitative analyses of coastal hazards across Alaska.

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