Long-Term Shore Changes
The development of a physics-based coastal morphology model incorporating the cross-shore profile evolution and the alongshore variation at two distinct time-scales is introduced. The new method assumes that frequent bed-level updates due to cross-shore transport gradients are necessary, while the longshore sediment balance can be accumulated numerically over longer times. An initial comparison of 20 years of morphological evolution is conducted for Onslow Beach, NC, a gently-varying contiguous sandy barrier island. The modeled change is in general agreement with well-predicted erosion and accretional regions are predicted within a factor of two.