RECENT COASTLINE TRENDS ON THE EAST MARGIN OF THE MIDDLE PARÁ ESTUARY

TENDÊNCIAS RECENTES DA LINHA DE COSTA NA MARGEM LESTE DO ESTUÁRIO MÉDIO DO RIO PARÁ

TENDENCIAS DE LA COSTA (1987-2019) EN LA MARGEN ESTE DEL ESTUARIO MEDIO DEL RÍO PARÁ

Abstract

The main objective of this article is to quantify the erosion and accretion rates on the eastern margin of the middle Pará Estuary within 32 years (1987, 1993, 1999, 2004, 2008, 2013, and 2019) with the use of remote sensing and data Digital Shoreline Analysis System (DSAS) extension. These methodological procedures recently applied in the Amazon region are effective in the search for intended results. To calculate with significant accuracy the rates of CL changes, select the parameters Net Shoreline Movement (NSM), Linear Regression Rate (LRR), and End Point Rate (EPR) to obtain the variations. In the middle estuary, the rates showed a tendency towards CL retreat in the onshore direction, with an average rate of −38 m and an average accretion rate of 22.97 m prevailing on Mosqueiro Island, related to average rates of variation of −0.58 m/ year (EPR) and −0.54 m/year (LRR) and in Santo Antônio do Tauá with LRR and EPR parameters identifying average rates of variation of −1.67 m/year (LRR) and −1.55 m/year (EPR). Only on Colares island, there was a tendency to accretion, with an average erosion rate of −96.29 m and an average accretion rate of 116.49 m, where the maximum accretion and erosion rates are 405.61 m and −396.87 m, respectively.

Keywords:
Eastern Amazon; Coastal Dynamics; Estuarine Environment; LANDSAT