A 1:75-scale three-dimensional hydraulic model was used to investigate the design of proposed modifications in various areas of Redondo Beach King Harbor. The model (originally used to develop plans for wave protection in the southern portion of the harbor in the lee of a low-crested breakwater section) reproduced approximately 8,800 ft of the California shoreline and included the existing harbor and offshore bathymetry in the Pacific Ocean to a depth of -60 ft. Improvements consisted of raising portions of the north and south breakwaters, flattening the slope of the existing north breakwater in the vicinity of an adjacent mole, and installing a spur on the inside of the north breakwater. An 80-ft long unidirectional, spectral wave generator and an automated data acquisition and control system were utilized in model operation. It was concluded from test results that (A.) For test waves from 260 deg, test results for existing conditions indicated severe overtopping of the breakwater adjacent of Mole A and subsequent flooding of the mole. The proposed improvement plan (Plan 1) with additional stone placed on a 100-ft-long section at the outer end of the Galveston seawall (Plan 1A) will minimize overtopping of the breakwater and flooding of the mole. (B.) For test waves from 240 deg, the proposed improvements (Plan 2) required modification to minimize overtopping of the breakwater and subsequent flooding of Mole A. Additional stone placed on a 150-ft-long section of the outer end of the Galveston seawall (Plan 2A) was required. The Plan 2 spur, it appeared, could be reduced in elevation (Plan 2A) and minimize wave energy reaching Mole A due to spilling waves propagating northerly over the breakwater. (C.) For test waves from 220 deg, existing conditions revealed severe overtopping of the south breakwater and Mole D with subsequent flooding of the mole and adverse wave conditions in Basin 3. The proposed improvement plans (Plans 3 and 3A) reduced wave heights in the Mole D/Basin 3 vicinity; however, overtopping of the south breakwater and Mole D still occurred, only not to as great a degree. Data obtained should aid in the design of structures proposed along the waterfront in the Mole D/Basin 3 area.


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    Title :

    Redondo Beach King Harbor, California, Development of Design Data for Harbor Improvements: Coastal Model Investigation



    Published in:

    Technical Report ; CERC-90-6


    Publication date :

    1990


    Size :

    8002967


    Type of media :

    Report


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :


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