EFFECT OF NET CROSS-SHORE SAND TRANSPORT ON BEACH PROFILES
AbstractThe concept of an equilibrium beach profile is convenient and widely adopted for long-term simulations of shoreline changes and beach profile evolutions. The equilibrium profile is regarded as a profile with net cross-shore sediment transport rate qn = 0. Kobayashi et al. (2008) proposed formulas for offshore suspended sediment transport rate qs and onshore bedload transport rate qb and derived the equilibrium profile equation of Dean (1991) for the case of qn = (qs+ qb) = 0. Their model is extended to equilibrium profiles with net offshore (qn<0) and onshore (qn>0) sediment transport rates. The equilibrium profile with qn=0 is modified by periodic beach nourishment (qn<0) and frequent sediment overwash (qn>0). The extended model predicts the degree and location of profile modifications as a function of qn and it can be used to improve beach nourishment design and devise barrier beach overwash countermeasures.
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