Siltation of the Port of Astoria

by Larry S. Slotta, Slotta Engineering Associates Inc, Corvallis, OR, USA,
William G. McDougal, Slotta Engineering Associates Inc, Corvallis, OR, USA,
Carlos R. Cobos, Slotta Engineering Associates Inc, Corvallis, OR, USA,
Jennifer M. Milbrat, Slotta Engineering Associates Inc, Corvallis, OR, USA,



Document Type: Proceeding Paper

Part of: Ports '86

Abstract: Sedimentation rates suddenly increased in the Port of Astoria, Oregon, immediately following the May 18, 1980 ash eruption of Mt. St. Helens. This ash was transported down the Columbia river and resulted in nearly two meters of siltation in the Port of Astoria the first storm season after the eruption. A goal of this research conducted during 1981-1982 was to determine the origin of the sediment found in the Port of Astoria slips. Another significant concern was whether the severe sedimentation would prove to be a relatively short-term problem or could lead to chronic additional dredging. Hydraulic modeling and field studies resulted in a sediment budget.

Subject Headings: Sediment | Ports and harbors | Silt | Volcanic deposits | Hydraulic models | Hydrologic models | Model analysis | Volcanic eruption | Ashes | Oregon | Washington | North America | United States

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