A New Formula Of The Long shore Sediment Transport Rate For Predicting Long-Term Beach Evolution
A new formula of long shore sediment transport rate for predicts long-term beach evolution is proposed and
compared with previous long shore sediment transport rate formulas. The new formula is developed based on interaction of
the long shore current and characteristic of sediment assuming that the long shore current due to wave breaking induced the
sediment migration. Besides depend on the long shore current, the migration of the sediment also depends on the
characteristic of the sediment that is permeability of the sediment. Sediment with high permeability will be easier to move
than sediment with low permeability. This new formula here has some clear advantages compared the Inman-Bagnold
formula and the two others formula existing. This formula has the smallest error in the simulation and contains a physically
based derivation of the sediment permeability dependence and indirectly through the mean long shore current velocity it
includes effect of beach profile shape such as slope. In addition, the new formula can be used to estimate beach changes not
only due to breaking waves, but also from currents generated by other mechanism such wind and sediment characteristic.
Keywords - Beach Evolution, Breaking Wave, Long shore Sediment Transport, Permeability And Sediment Characteristic.