Abstract
The bottom shear stress under skew waves can be used in a sediment transport modeling under rapid acceleration occurring in the surf zone. The bottom shear stress in a rough turbulent bottom boundary layer under sawtooth waves has been examined through two methods by Suntoyo and Tanaka 1) . One is to fit logarithmic velocity profile to the measured velocity in an oscillating wind tunnel, another is a calculation method incorporating acceleration effect. However, an investigation of a more reliable calculation method to estimate the time-variation of bottom shear stress has not been fully dealt with. In the present study, the bottom shear stress of experimental result will be examined with a new calculation method of bottom shear stress based on incorporating velocity and acceleration terms all at once. A new coefficient is proposed to express a wave skewness effect on bottom shear stress under skew waves.
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