Análise multitemporal da linha costeira na Costa do Cacau, Bahia

Multi-temporal analysis of the coastline in the Cocoa Coast, Bahia

Abstract

 The Costa do Cacau, located on the southern coast of the state of Bahia, is a very important region from an environmental point of view, as it harbors one of the greatest biodiversity on the planet. In addition to this, the region attracts a lot of tourist activity due to the beauties of its beaches distributed along about 180 km of coastline. However, as in all coastal areas, it suffers from the advance and retreat of the coastline, which constantly changes its position at various time scales, intensifying the need to carry out studies aimed at understanding the dynamics of the coastline, as a subsidy for the maintenance and protection of this environment. In this sense, this work has its relevance highlighted, as it aims to characterize the space-time variations of the coastline in the Costa do Cacau region in the decadal time interval, between the period from 1990 to 2020. A historical analysis of the coastline was carried out through multispectral orbital images with low cloud cover for the study region, from the series of Land Remote Sensing Satellite (LANDSAT) satellites. For the medium-term analysis period, 30 years, four coastlines were used, from the years 1990, 2000, 2010 and 2020. It was concluded that the study provided, in a quantitative and qualitative way, the analysis of the dynamics of the coastline in the region of Costa do Cacau. The total area modified by accretion and erosion processes increased significantly between the first (1990-2000) and the last (2010-2020) period of the investigated decadal interval. It is noteworthy that, considering the social, economic and environmental importance of the Costa do Cacau, continuous monitoring is necessary in order to better understand the coastal dynamics of this region