CHAPTER 145 LONGSHORE SEDIMENT TRANSPORT RATE vs. CROSS- SHORE DISTRIBUTION OF SEDIMENT GRAIN SIZES

Existing models for longshore sediment transport rate computations assume the sediment grain size and grain size-related parameters to be uniform in both the cross-shore and longshore directions. Field results from tideless beaches, which are briefly described in the paper, show that the lat-ter change in both directions due to changing wave energy-levels. The sensitivity analysis described in the paper shows that both longshore current and transport rate computations are sensitive to the cross-shore changes in grain size.Final-ly, a modified linearity coefficient for the wave power equa-tion is proposed based upon the cross-shore distributions of grain size as found in nature. 1