Migração do campo de dunas transgressivas da localidade Tatus, Ilha Grande - PI

Abstract

The dunes play an important role in the coastal environment in terms of preserving the coastal zone, protecting against storm waves and undertows. The present research that has as study area the dunes located in the locality Tatus, located in the municipality of Ilha Grande PI, which are included in the APA Delta do Parnaíba, and through the use of geotechnologies, geoprocessing and remote sensing, it has the general objective of quantifying the dune movement rate between the period of 1990 and 2022 on water resources, urban areas and vegetation, making it possible to define prohibition zones subjected to burials by dunes. The transgressive dunes of the Tatus locality present a set of eolian forms and features with varied morphologies, which move according to the prevailing wind direction, composing the beach dynamics as a support of sediment that feeds this system to control erosions through waves and tides. Through the Hysplit program - online version, the trajectories and frequencies of the winds were calculated, in which the prevailing wind direction was found, NE/SW direction, and after mapping the dune fields for the years 1990, 2000, 2010 and 2022, the migration rates for three dune fronts were calculated, obtaining in section A 11.20 m/year, in section B 20.45 m/year year and in section C 18.65 m/year. In the end, a map was generated identifying the evolution of the dunes and outlining their front, indicating areas that are at risk of burial due to sediment transport.