Prevention of Shoaling at Port Orford, Oregon

by C. E. Chatham, Hydr. Research Engr. and Chief, Wave Processes Branch; Wave Dynamics Div., Hydrs. Lab., U.S. Army Engr. Waterways Experiment Station, P.O. Box 631, Vicksburg, Miss. 39180,

Serial Information: Journal of the Hydraulics Division, 1981, Vol. 107, Issue 11, Pg. 1303-1316

Document Type: Journal Paper


A 1:100-scale undistorted hydraulic model of Port Orford, Oregon, and sufficient offshore area to permit generation of the required test waves were used to develop and test several plans of improvement proposed to eliminate harbor shoaling without adversely affecting wave heights at the existing pier. Improvement plans consisted of removal of portions of the existing breakwater, realignment or lengthening of the existing breakwater, and construction of new breakwater structures in the vicinity of Fort Point and Battle Rock. A 54-ft-long wave machine, electrical wave height measuring and recording apparatus, and coal and nylon tracer materials were used in the model. Tests were conducted with prebreakwater and existing breakwater conditions, and the results were compared to determine the causes and sources of harbor shoaling. Improvement plans were then tested and compared with existing prototype conditions. Of the plans tested, the optimum configuration appeared to be an 1100-ft-long angled breakwater extending from Fort Point.

Subject Headings: Breakwaters | Wave shoaling | Shoals | Ports and harbors | Hydraulic models | Wave generation | Existing buildings | Permits | Oregon | United States

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