Caracterização morfológica da praia da Atalaia/Pa

Abstract

Atalaia Beach, located in the municipality of Salinópolis/PA, was monitored for eight months (August 2004 to March 2005) with the objective of characterizing the morphological and textural variations that occur mainly on the beach face. The methodology used for the topographic surveys was the Stadia Method. For the textural characterization samples were collected every 50 m, along the profiles that were later submitted to granulometric analysis. The analysis of the profiles highlighted the dissipative character of the beach during the months studied, as well as the record of well-developed ridge-ridge systems laid parallel to the coastline, which are very dynamic, migrating towards the post-beach zone. The "runnels" have considerable dimensions (on average, 10 meters wide) and occur along a practically continuous strip. During the studied period an erosive trend was evidenced in all the monitored profiles. The preliminary textural analysis of the beach sediments shows the predominance of very fine sand, quartz, moderately selected, with positive asymmetry and mesocrustic character. The beach sediments are being processed to define the presence of grain diameter granocrescence or granodecrescence along the profiles. At the end of the monitoring, planned for 12 months, the sediment balance will be performed in the profiles for the quantitative characterization of the erosional and/or depositional character.