Performance of a Berm Roundhead in the St. George Breakwater System

by Jeffrey F. Gilman, Peratrovich, Nottingham & Drage Inc, United States,

Document Type: Proceeding Paper

Part of: Berm Breakwaters: Unconventional Rubble-Mound Breakwaters


A new harbor under construction on St. George Island in Alaska's Bering Sea is using the berm breakwater concept for protection from wave attack. Three breakwaters are included in the system, two outer breakwaters to protect an entrance channel, and an inner breakwater to protect an 8-acre moorage basin. In late 1986 the designers were faced with a shutdown in construction with the North Breakwater roundhead only half finished. There was a question as to the capacity of the structure to withstand wave attack. The purpose of this paper is to demonstrate that during the winter of 1986-87 storms occurred which approached the design storm in intensity and that, even with the half-complete nature of the structure, the berm roundhead performed very well and suffered only minor berm profile modification.

Subject Headings: Breakwaters | Coastal protection structures | Berms | Water waves | Seas and oceans | Storms | Ports and harbors | Construction management | Bering Sea

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