Experiment on the Bottom Shear Stress of Sand Ripple Bed Under Wave Action

When the strength of wave traveling over sandy bed reaches a certain condition, the bed form will be changed, to form the sand ripple bed. The formation mechanism of the bottom shear stress on ripple bed differs from that on plane bed. However investigation on the bottom shear stress on ripple bed is foundation of the investigation on the wave damping with traveling and the sediment transport. Therefor, this investigation is significant. The present paper measured the bottom shear stress directly and gave formulas to calculate the bottom friction factor and shear stress on the ripple bed.