Erosão costeira em praias adjacentes às desembocaduras fluviais: o caso de Parajuru, município de Beberibe-CE.

Abstract

The study area is within the region of Parajuru, Beberibe County, on the east coast of Ceará State. This region is characterized by the intense action of coastal processes, causing morphoiogical instability in much of the area. The main objective of the research is to analyze coastal erosion, its causes and consequences. The development work was carried out by application of cartographic techniques (aerial photos, multitemporal satellite). The multitemporal images indicate the evolution of sediments in the years 1975, 1987, 2007 and 2010, showing the formation of the sandbar and the dynamics of migration of river mouth Pirangi. Among the highiights are observed causes the decrease of river discharge and consequent increased transport of sediment by longshore drift , forming a sandy bar across the channel by preventing its mouth being moved a few miles from its original position . In this study we sought to survey the environmental characterization of the physical conditions of the area, was also performed analysis of heavy minerais by scanning electron microscope ( SEM) coupled with energy dispersive detector ( EDS ) and analyzes of x-ray diffraction clay . The resuits show a strong erosive character west of the mouth of the river which caused the destruction of tents, roads, inns and hotels.