A numerical study of the wave response of the proposed small-boat harbor to be located on the west coast of Guam, near Agat, is escribed. The base plan considered consists of a basin dredged in the coral reef at the site, connected at its south end to the ocean by a 900-ft channel. Protective structures include revetments along the shore, a 190-ft stub breakwater and revetment at the south end of the harbor, and an 885-ft detached breakwater seaward of the harbor basin. The HARBS finite element wave model is used to determine the wave response of the base plan (Plan 1) and the following four alternative plans: -a. A plan suggested by the US Army Engineer Waterways Experiment Station's Coastal Engineering Research Center (Plan 2) in which the detached breakwater is extended by 180 ft on the south and 100 ft on the north, the stub breakwater is extended seaward by 60 ft, and the channel is shifted to the south. -b. Plan 3, in which a 150-ft jetty extends seaward from the shore at the north end of the harbor. -c. Plan 4, in which the north end of the detached breakwater is extended by 150 ft. -d. Plan 5, in which a second detached breakwater, 150 ft long, protects the north end of the basin. The harbor plans are tested with waves ranging in period from 8 to 20 sec and with approach directions of 270 deg (from due east), 248.1 deg, and 315 deg. Water levels used are 2.4, 4.8, and 7.2 ft above mean lower low water, corresponding to high tide and two different storm surge levels. Wave generation to the north in Agat Bay is considered and found to be less important as a wave source than wave generation in deep water to the west. The study found that Plan 4 best meets the best meets the requirements of the project. It is determined that this plan will keep the wave height in most of the harbor interior at 1 ft or lower 90 percent of the time. Plan 4 also gives the best wave protection for high water levels (as in storm surges). This plan provides the best overall wave protection for the smallest increase in construction cost over Plan I.
Wave Response of the Proposed Habor at Agat, Guam
Technical Report ; TR-CERC-87-4
1987
3598321
Report
Electronic Resource
English
Results of monitoring study of Agat Harbor, Guam
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