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A beach morphology model based on sediment suspension and settlement is applied to a system of seven submerged groins, which have a function of reducing the speed of longshore currents and controlling beach erosion. Nearshore currents are computed with the PEGBIS model by Goda (2004) for directional random wave transformation, and beach morphology is estimated with the suspended sediment transport model by Katayama and Goda (2003) with a new suspension coefficient by Goda (2010). The computation indicates the efficacy of a submerged groin system for beach erosion control. Discussions are made on some aspects of the submerged groin system to be clarified through further investigations.

SUSPENDED-SEDIMENT-BASED BEACH MORPHOLOGY MODEL APPLIED TO SUBMERGED GROIN SYSTEM