Abstract
Bottom shear stress estimation is the crucial step, which is required as an input to most of sediment transport model. Acceleration effect in waves with a bit of saw-tooth asymmetry causes the higher bottom shear stress occurs at higher acceleration and hence a higher probability for sediment transport. The acceleration effect on turbulent bottom boundary layer is investigated with the experiments in oscillating wind tunnel over rough bed under saw-tooth wave by Laser Doppler Velocimeter (LDV) to measure velocity distribution. Bottom shear stress will be estimated by fitting the logarithmic velocity profile to the measured velocity. Furthermore, the experimental results will be examined with the bottom shear stress calculation method incorporating acceleration effects.
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