Estudo da dinâmica da linha de costa na ilha de Xefina 2004 – 2016

Abstract

The problem of changing the coastline in the Xefinas Islands is quite old. There are documental and oral reports that once existed ancient Xefina however, over time was disappearing. Some factors are pointed out as the causal agents of the coastline change for this region, as is the case of erosion and the rise in mean sea level. This problem has worried the local community, since with the floor of the island the island is decreasing its portion and in the near future will be forced to leave this region. The present work has the objective of evaluating the changes in the coast line of the Island of Xefina during the period of 12 years, for which satellite images recorded in the years 2004 and 2016 were used. Results found indicate that of the total area of the current area, 6.2 km² reduced on .. Comparing the area of the island, from 2004 to 2016, 6.2 km² of land (3%) were swallowed by water, and the results of the calculations of the speed of the decrease of the portion of land, reveals that. 5,5 m / year on the North side, 4,8 m / year to the West, 3,2m / year to the South and 2,050 m / year to the East.