SfM-MVS and GIS analysis of shoreline changes in a coastal wetland, Parque Costero del Sur biosphere reserve, Argentina

Abstract

Two aerial surveys were processed with Structure from Motion - Multiview-Stereo with a Co-Alignment approach in two sectors of a wetland: El Picaflor (EP) and El Sarandí (ES). Shoreline changes were analysed with Digital Shoreline Analysis System (DSAS) using high-resolution orthophotos and change detection was calculated with M3C2. In EP the shoreline changes rate averages −0.71 m/yr and the M3C2 comparison shows that the coast is mainly erosional. In ES the shoreline rates of change averages 0.59 m/yr and the M3C2 comparison shows both erosion and deposition. When EP and ES were compared, the main differences are land use, orientation of the coast, and the presence of intertidal vegetation. The use of the Co-Alignment approach together with DSAS proves to be a valuable technique for monitoring shoreline changes at a high spatial and temporal resolution in this wetland and can be applied to study other coastal wetlands worldwide.