American Society of Civil Engineers


Coastal Evolution and Sediment Budget at the Mouth of the Columbia River, USA


by Guy Gelfenbaum, (U.S. Geological Survey, 345 Middlefield Road, MS999, Menlo Park, CA 94025 E-mail: ggelfenbaum@usgs.gov), Maarten C. Buijsman, (Washington State Department of Ecology, Coastal Monitoring and Analysis Program, P.O. Box 47600, Olympia, WA 98504 E-mail: mbui461@ecy.wa.gov), Christopher R. Sherwood, (U.S. Geological Survey, 345 Middlefield Road, MS999, Menlo Park, CA 94025 E-mail: csherwood@usgs.gov), Hans R. Moritz, (U.S. Army Corps of Engineers, Portland District, P.O. Box 2946, Portland, OR 97208 E-mail: hans.r.moritz@usace.army.mil), and Ann E. Gibbs, (U.S. Geological Survey, 345 Middlefield Road, MS999, Menlo Park, CA 94025 E-mail: agibbs@usgs.gov)

pp. 818-827, (doi:  http://dx.doi.org/10.1061/40566(260)84)

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Document type: Conference Proceeding Paper
Part of: Coastal Dynamics ’01
Abstract: The coastal morphology of the Mouth of the Columbia River (MCR) has changed dramatically over the past century. Since the construction of jetties in 1914 and 1917, the inlet deepened and stabilized, the outer ebb delta migrated northward and offshore several kilometers, and the adjacent shorelines to the north and south prograded several hundreds of meters. Recently, high rates of erosion along these adjacent shorelines affecting parklands have raised questions about the cause of the erosion. The purpose of the sediment budget analysis presented here is to address these questions by quantitatively examining the links between the morphology change of the shoreline and the ebb delta and historical changes in local and regional sediment supply.


ASCE Subject Headings:
Budgets
Coastal environment
Columbia River
Sediment
Shoreline changes