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Numerical computations are made for the nearshore currents and morphology around a system of multiple submerged groins. They function in decreasing the speed of longshore currents and controlling beach erosion. Nearshore currents are computed with the PEGBIS model by Goda (2004) for wave transformation and beach morphology is estimated with the suspended sediment transport model by Katayama and Goda (2000). The computation indicates the efficacy of a submerged groin system for beach erosion control.

The state of beach erosion of the southern unit of the Romanian Black Sea shore is described with explanation of its mechanism. Beaches in the northern part of the study area are composed of terrigenous sand from the Danube, while the sediment in the southern beaches is made of shell fragments. Shoreline changes over years have been well reproduced with the one-line model and the net sediment transport rate is evaluated at several coastal units.