Inundação E Erosão Na Costa Norte Do Rio Grande Do Sul - Brasil. Estudo De Caso: A Maré Meteorológica De Outubro De 2016

Abstract

m³/m no balneário planejado e 3,54 m³/m no sem planejamento, ambos distantes cerca de 22 km. A altitude média de 2,00 m foi inundada, e as águas ultrapassaram os 200 m além das dunas frontais. A reconstrução do evento demonstrou que os balneários adjacentes às desembocaduras foram os mais impactados.

Coastal Erosion and Flood Susceptibility in Paraty, Southeast Brazil

“…Values (Table 1) and classes for susceptibility mapping were assigned to each category: low (7 to 11), medium (12 to 16), and high (17 to 21). the event and identify the most susceptible areas, as per Vianna et al (2020). This tool enables the simulation of flooded areas, based on the knowledge of the increase in mean sea level or the maximum altitude flooded during a given event (Vianna et al, 2020).…”

“…the event and identify the most susceptible areas, as per Vianna et al (2020). This tool enables the simulation of flooded areas, based on the knowledge of the increase in mean sea level or the maximum altitude flooded during a given event (Vianna et al, 2020). From the simulation, the flooded area was vectored on ArcGis 10.7 and placed on the orthomosaic corresponding to the year 2019, for better identification of places susceptible to flooding.…”

“…Many of these buildings were destroyed or damaged during the extreme events that took place in 2016 (Figure 4D, E, and L). The greatest damage caused by coastal flooding generally occurs in areas with the highest concentration of buildings, as observed by Vianna et al (2020) and Maia et al (2016) on the Rio Grande do Sul coast and by Höffken, et al (2020) on the German coast. Among the areas studied in Paraty, Jabaquara Beach, the central area of Paraty, and Ranchos Beach (Trindade) were considered the most vulnerable, due to their greater susceptibility to flooding and the high concentration of urban structures at risk of damage.…”

“…The knowledge of the maximum altitude flooded during an extreme event (according to each mapped area), when superimposed on the digital surface model, enables the identification of areas potentially susceptible to flooding, based on simulations (Vianna et al, 2020). The areas identified here as more susceptible to flood events (Jabaquara and Centro, with emphasis on Terra Nova) are frequently flooded during periods of high syzygy, combined with storm waves.…”

“…The area south of the Perequê-Açu river is the most susceptible to flooding. Areas close to the mouth, inside estuaries and at low altitudes areas not protected by frontal dunes, are generally susceptible to flooding (Vianna et al, 2020). Even though they are sheltered areas with low energy waves (not exceeding 1 m in height), during extreme events, the water level covers the entire beach and invades sidewalks and streets parallel to the beach (Figure 4F to K; Figure 8 A and B).…”