Average rates of shoreline change are key indicators for assessing coastal evolution. The study area is located in

Salinópolis, on the northeastern coast of Pará, Brazil, covering urban, estuarine, and natural zones, including Corvina, Maçarico, Farol

Velho, and Atalaia beaches. Between 1984 and 2024, despite an overall trend of shoreline accretion, areas with growing human

occupation experienced significant coastal erosion, causing building retreat, partial home loss, and damage to beach access roads. Using the

Digital Shoreline Analysis System and dense satellite image time series processed in Google Earth Engine, the coastline was analyzed

in four sectors (A, B, C and D). The sector B with the greatest erosion showed an average linear retreat of –1076.31 m, while another sector

reached a maximum advance of +1079.78 m, indicating a spatially alternating pattern between erosion and accretion. The average linear

rate of change showed a slight overall shoreline retreat, accompanied by high morphodynamic variability and low statistical consistency in

linear trends. Urbanized sectors exposed to ocean forces were most vulnerable to erosion, whereas estuarine and mangrove areas were

more stable. The high sediment supply from estuaries contributed positively to shoreline accretion in several regions. Projections for

2034 and 2044 suggest the shoreline will mostly retain its current shape within uncertainty margins. However, sector C faces a potential

pronounced retreat, threatening frontal dunes and coastal infrastructure. These findings emphasize the importance of strategic

coastal management considering natural and human influences on shoreline dynamics.