Avaliação da erosão costeira da praia de Palane-Madal, Provincia da Zambézia

Abstract

The problem of coastal erosion is one of the paradigms for most of the coastal region. Palane Beach has been showing a progressive advance of erosion since before. Some homes have already been reopened to some places once thought to be safe. Lately the erosion has advanced at a rate already seen more. In order to evaluate this advance were used images of Landat Satellite 7 in the period from 2011 to 2016 were measured the velocities of the current, the height and energy of the waves, the wind intensity was measured, a topographic survey of the slope of the beach was made, were collected samples of sediment on the beach and, in addition, an inquiry was made to local inhabitants about coastal erosion. Results indicate that in the period from 2011 to 2016 erosion has increased by 105m and is currently advancing at a rate of 0.25m/ month. From the various agents analyzed it was noted that the major contributor to erosion in this region are the energy waves of 302J/m) associated with the size of the sediments 2 ϕ to 4ϕ and the slope of the beach of 50º. From the results it was also observed that this region is influenced by winds from 3.2m/s to 4.9m/s that contribute to waves reaching 1m high. In projections made with a model of 80% of the level of confidence, it is noted that if no reduction measures are taken, this erosion could reach new homes by 2066.