The main problem that occurs on gravel beaches is certainly erosion caused by wind waves. In Croatia, due to growing tourist demand, systematic coastal monitoring is becoming an important part of existing coastal management actions, in order to efficiently maintain the shape and improve capacity of beaches. For these purposes, digital elevation models of examined areas are being developed, and SfM (Structure from Motion) photogrammetry is increasingly used, since it is a low-cost, fast and simple method for data collection. This technology allows the creation od three-dimensional point clouds of the observed areas with high precision and resolution, from a series of photographs. This paper describes the application of this procedure to the research of erosion of the Beach Ploče in Rijeka. After 7 terrain surveys, the corresponding point clouds were compared in CloudCompare. The results show that in 50 days after nourishment, the beach lost approximately 50 m³ of material, as a result od wave activity during strong winds from the south. In the eastern cell of the beach, where the movement of material is mainly perpendicular to the shoreline, a comparison of the shape of the beach with the theoretical Shingle model was performed.