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The mechanical properties of bottom shear stresses in the surf zone is still uncertain. This study has investigated the temporal and spatial distributions of the bottom shear stresses in the surf zone. The experiments have indicated that the temporal and spatial distributions of the bottom shear stresses varies, depending on the water surface level and flow velocity. The time variations of the bottom shear stresses and velocity in the same phase of the water surface level changes. Thus, the water surface level changes in the same phase of the velocity in the surf zone. The maximum bottom shear stresses have shifted from the peak of the water surface level. The bottom shear stresses under the peak of waves tend to be larger than those under the trough of waves.

Experimental Study on Temporal and Spatial Distributions of Bottom Shear Stresses in Surf Zone