SEDIMENT BUDGET AND EQUILIBRIUM BEACH PROFILES APPLIED TO RENOURISHMENT OF AN EBB TIDAL DELTA ADJACENT BEACH, MT-MAUNGANUI, NEW-ZEALAND

An ebb tidal delta adjacent beach was nourished by placement of dredge d material in water depths of 4-7 m below Chart Datum. The beach and n earshore were subsequently monitored with accurate integrated beach-ne arshore surveys along 7 transects. All the nourishment material could be accounted for by onshore movement resulting in 89 m(3) m(1) of accr etion within 15 months of placement. Application of the Dean's Equilib rium Beach Profile model, before, during and after disposal, indicated that before nourishment the beach-nearshore profiles exhibited a defi cit of sediment throughout their length. After nourishment, the profil es adjusted towards the equilibrium profile predicted by the model.