Variações temporais da linha de costa do município de Acaraú – Ceará – Brasil

Abstract

This research was carried out by using and application of Landsat 5TM digital images, including different periods of analysis (july 7 1987, june 10 1991, july 2 1999 and august 11 2008) of the east littoral of Acaraú district, in Ceará State. After the use of the image processing techniques (the composition RGB color, bands, analysis of the main components, index methods, among others), was possible develop morphodynamic multi-temporal maps of the area. The propose of this study was the multi-temporal monitoring of the environment through the identification and analysis of the environments elements in the field, and analyzing images of orbital sensors of different years, including the last two decades. In this way was possible the identification of the principal elements in the surface of the studied area, associating the spectral characteristics of each elements that was presented by the image products resulting of the digital processing. Therefore, was possible identify the sea/land limit, shallow submersed areas and suspended sediments. The multi-temporal maps of the coastal morphologic showed the identification and evaluation of the erosion and deposition process in the last two decades.