Time Dependent Shear Stress Beneath a Shoaling Wave
NAVAL ACADEMY ANNAPOLIS MD ANNAPOLIS United States
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The celerity of a shoaling wave was measured and plotted as a function of the parameter dLo and compared to linear wave theory. A noticeably higher celerity was measured in the free stream than was measured by hot film shear sensors in the boundary layer. Hot film shear sensors were also used to determine the phase relationship between shear stress and free stream particle velocity. Data results indicate that the maximum shear stress in an oscillatory flow field leads the maximum particle velocity by approximately 30 degrees - 35 degrees and that this has increased with distance from the bottom. The phase difference was also found to be dependent upon the length of the incident wave.