Inundação costeira por elevação do nível do mar em Imbé e Tramandaí - RS

One of the consequences of sea level rise is the predisposition of the population and the ecosystem to coastal flooding. The vulnerability can cause distinct impacts depending on the elevation of the terrain and the extent of the occupied area. Imbé and Tramandaí located on the northern coast of RS are two municipalities that present low elevation and densely occuppied area. A bathtub model was created from topographic data to determine flood levels. Seven sea level rise scenarios were considered, based on a set of extreme marine events recorded in the study area, resulting from the sum of the following variables: Tidal and sub-tidal oscillation, and wave run-up. In addition to the current sea conditions, future projections of sea level variation were incorporated in this analysis according to the IPCC. The lowest level of elevation of the level was 2.07 m and the highest of 4.33 m. The maps generated made it possible to describe the vulnerability to sea level rise, as well as to recognize the sites with the largest flood levels. The analysis of the results showed that the extent of vulnerable areas will increase with time and that the coastal management plans of the municipalities should address this in order to mitigate the consequences of possible flooding.