Hydraulic Characteristics of Mobile Breakwaters Composed of Tires Or Spheres: Hydraulic Laboratory InvestigationTwo new types of mobile breakwaters consisting of tire and sphere assemblies, respectively, were tested. Tests covered a wide range of wave conditions, water depths, and breakwater dimensions. Experimental measurements were made to determine the wave reflection and wave transmission coefficients, the power dissipated by the breakwaters, and the forces in the mooring lines of the breakwaters. It was found that for these types of floating breakwaters to be effective their length should be on the order of one-half to one wavelength, their depth on the order of half the water depth, and the wave steepness equal to or greater than about 0.04. The effectiveness of these breakwaters can be improved by decreasing their porosity and flexibility; however, this would cause an increase in the mooring forces and the drift, the drift being the result of the difference between the forces in the seaward and shoreward mooring lines. (Author). |
Contents
PART | 19 |
Variation of Force in Mooring Lines with wL Tire | 27 |
LITERATURE CITED | 31 |
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Calif Chief of Engineers Civil Engineering decreases for increasing different values direction of wave Division 1 ATTN effect of y/d Engineering Division equation fc/ftmax floating breakwaters H/L for different H₁/L Hi/L SPHERE ASSEMBLY Hi/L TIRE ASSEMBLY horizontal force exerted Hydraulics incident wave increasing values LEGEND W/L Library 1 ATTN line of breakwater Maximum force mobile breakwaters consisting mooring line forces order of one-half porosity presented in plate Project Planning Branch reflected waves reflection and transmission reflection coefficient seaward and shoreward shoreward mooring lines shown in fig shown in plates SPHERE ASSEMBLY y/d tire and sphere TIRE ASSEMBLY 1.2 TIRE ASSEMBLY y/d Tomales Bay type of breakwater U. S. Army Univ values of w/L VERSUS Hi/L SPHERE VERSUS Hi/L TIRE vertical wall water depth Waterways Experiment Station wave conditions wave period wave power wave propagation wave reflection wave steepness wave transmission coefficient wavelength Δ Δ