Experimental Study of Wave Attenuation by Quadrangular Hollow-Block Breakwater
In this paper,the wave attenuation performance on different types of sloping beaches is investigated by comparing the wave run-up on three types of beaches,namely,a smooth slope,a quadrangular hollow-blocks covered slope and a plant-blocks covered slope,through a geometric scaling wave flume test.Different wave periods and wave heights have been tested for the hydrodynamic characteristics and maximum run-up.The experimental results reveal that plants within the quadrangular hollow blocks mitigate the direct impact of waves on the hollow blocks.This intervention reduces wave run-up,enhances the wave attenuation of quadrangular hollow blocks.On all three sloping beaches,there is a nearly linear relationship between the wave run-up and wave height for both regular and irregular waves.The roughness permeability coefficients for the smooth and blocks covered beaches obtained in the tests are found to agree well with the design guideline.It is also found that the changing trend is most significant for the smooth slope,followed by the hollow-blocks slope,and the plant-blocks covered slope has the least variation,reflecting the difference in the roughness permeability coefficients of the corresponding surfaces.With a specific wave height,within the range of periods considered in the experiment,wave run-up increases slightly with the wave period for all three sloping beaches,but its increase is not significant.
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