**2. Methodology**

The data displayed are the result of bibliographic research, analysis of maps and satellite images, and fieldwork on the studied areas. In relation to Fortaleza, Brazil, data of direction and velocity of currents were also collected from the Brazilian Ministry of Navy. Data of bathymetry and sea level rise were digitized from the Brazilian navigation charts. Finally, measurements were made on satellite images on Google Earth, in order to define volumes of sediments available and accumulated on the shoreline. In relation to Canoa Quebrada beach, Brazil, topographic profiles covering a 300 m stretch were made in six distinct points, using a total station. Highresolution satellite images were analyzed in a 2004, 2008, and 2017 time series, in order to define the behavior of the cliff break line and determine its retreat speed. For the analysis and georeferencing of the images, the software QGIS, version 2.12, developed by the Open Source Geospatial Foundation—OSGeo, was used with DATUM SIRGAS 2000, projection UTM zone 24 S.

For northern Colombia, beach profiles along 600 km and bathymetry survey were conducted. The beach profiles were made using a total station. The bathymetry survey (10 m water depth) was conducted using a precision echo sounder and a GPS (Global Positioning System) mounted on a vessel. The bathymetry beyond 10 m water depth was digitized from the south Caribbean navigation charts. A total of 270 sediment samples were also collected. The up-to-date nearshore bathymetry data were used in the modeling of nearshore wave field. Finally, time-series aerial photos available from Google Earth were analyzed to depict beach/dune changes at various locations.
