A 1:100 scale (undistorted) hydraulic model of Los Angeles Outer Harbor, California, was used to investigate short-period storm wave conditions for proposed harbor development located near the IS Gate entrance. The model reproduced the proposed harbor expansion, Angel's Gate entrance, portions of the existing breakwaters, and sufficient bathymetry in San Pedro Bay to permit generation of the required test waves. An SO-ft-1ong electrohydraulic, unidirectional spectral wave generator and an automated data acquisition and control system were utilized in model operation. It was concluded from the model investigation that: -a. The originally proposed outer harbor expansion plan (Plan 1) will result in wave heights that will exceed the established criteria of 6.0 ft in the tanker terminal and 1.5 ft in the container terminal a small percentage of the time. Maximum wave heights obtained were greater than 10 and 4 ft in the tanker and container terminals, respectively. The criterion will be exceeded on an average of 7.35 hours per year in the tanker terminal and 21.45 hours per year in the container terminal. -b. Sealing of the Middle Breakwater (Plan 5) will result in slightly improved wave conditions in the container terminal of the outer slip for test waves from 209 and 154 deg. -c. A 200-ft westerly extension of the Middle Breakwater (used for several test plans) will slightly, but not significantly, reduce wave heights in vessel terminal areas. -d. Decreasing the navigation width between the proposed landfill and Middle Breakwater from 1,200 to 1,000 ft (Plan 8) will not significantly reduce wave heights at the terminals; however, an .increase of the navigation opening to 1,400 ft (Plan 22) will substantially increase wave conditions in these areas. -e. The 1,800-ft-long San Pedro Breakwater spur in conjunction with a 200-ft westerly extension of the Middle Breakwater (Plan 14) will result in wave heights that exceed the established criterion in the container terminal and that meet the criterion in the tanker terminal areas. Maximum wave heights obtained in the container terminal were about 3 ft, but the criterion at this location will be exceeded on an average of only about 4.65 hours per year. -f. The installation of vertical walls in the southern slip (Plan 19) will result in very rough and confused wave conditions in the container terminal due to wave reflections with wave heights up to 9 ft at this locatipn. -g. Reducing the southern slip width from 1,000 to BOO ft (Plan 20) will result in wave heights that exceed the established criterion in the container and tanker terminals; however, wave heights were of less magnitude than the original Plan 1 expansion configuration and the criteria would be exceeded a smaller percentage of the time. Maximum wave heights were 8.2 and 2.6 ft in the tanker and container terminals, respectively. It is estimated the established 1.5-ft criterion in the container terminal would be exceeded on an average of 3.45 hours per year, and the 6.0-ft criterion in the tanker terminal exceeded about 4.2 hours per year. -h. The revetted/vertical wall northern slip configuration (Plan 24) will result in the established 1.5-ft wave-height criterion being exceeded by only 0.2 ft at one mooring location for only one wave condition. This condition will occur on an average of only 0.15 hour per year.
Wave Conditions for Proposed Harbor Development in Los Angeles Outer Habor, Los Angeles, California
Technical Report ; CERC-89-13
1989
8328411
Report
Electronic Resource
English
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