A 1:52-scale three-dimensional (3-D) hydraulic model was used to investigate the design of a proposed boat-launching facility at Laupahoehoe Point, Hawaii, with respect to wave action. The model reproduced Laupahoehoe Point, approximately 3,000 ft of the Hawaiian shoreline, and sufficient offshore area in the Pacific Ocean to permit generation of the required test waves. Improvement plans included a rubble-mound breakwater armored with dolosse and stone, a wave absorber, a natural entrance channel, a turning basin, and a boat-launching ramp. A 20-ft-long electrohydraulic wave generator and an automated data acquisition and control system were utilized in model operation. Test results for the 3-D wave action model indicated that for base test conditions, rough and turbulent wave conditions existed in the vicinity of the proposed boat-launching facility not only during periods of severe wave attack but also for conditions when incident waves were in the 4- to 6-ft range. Waves breaking in the area and/or waves reflecting off the rugged shoreline contributed to these adverse conditions. Eleven test plans were tested and results indicated that (a.) 200-ft-long rubble-mound breakwater and a 60-ft-long wave absorber (Plan 10) were optimal considering wave protection provided and construction costs. The established 2.0-ft wave height criterion will be achieved in the turning basin about 67.1 percent of the time and at the new boat ramp approximately 84.7 percent of the time for this plan. Test results for the 3-D breakwater stability model indicated the following: (a.) Two layers of random placed 30-ton dolosse with a special placed and entrenched toe is an adequate design for placement on the slopes of the outer 90 ft of the breakwater. (b.) On a qualitative basis, the 10 ton dolosse, 3- to 5-ton stone, and 1- to 3-ton stone should be adequate designs for the breakwater slopes between sta 1+40 and 1+10, sta 1+10 and 0+30, and sta 0+30 and 0+00, respectively. (c.) The outer end of the modified rib cap should provide better interlocking potential with the dolosse than the original design. (d.) Both the vertical and modified toe trench provide adequate protection against dolosse and stone slippage.
Design for Navigation Improvements, Wave Protection, and Breakwater Stability for Proposed Boat-Launching Facility, Laupahoehoe Point, Hawaii: Coastal Model Investigation
Technical Report ; TR-CERC-87-3
1987
24804062
Report
Elektronische Ressource
Englisch
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