Made available in DSpace on 2015-03-13T17:08:15Z (GMT). No. of bitstreams: 1 IracemaMS_ate_cap2.pdf: 1884738 bytes, checksum: 04a372407b9d63ca84991f620a13d93b (MD5) Previous issue date: 2002-04-30 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The work concerns on the evolutionary study of the environmental conditions of the coastal area of Guamar?-RN, where was investigated the geo-environmental transformation occourred in this region, whose primordial purpose was to diagnose the changes verified in the temporary space of five decades (1950 to 2001). With the objective of evaluanting the action of the active coastal processes (currents, waves, tides and winds), in order to understand the generating mechanisms of the erosion/sedimentation, evidenced by constant morphologic changes. The adopted methodological procedure consisted of a succession of stages, involving bibliographical and cartographic study, aereal photographs study, digital treatment of images, field work (sample collection, beaches profiles, characterization of the beach environment and morfodynamics), mapping correction and laboratory analyses (granulometry). The evolutionary study of the morphologic features indicated significant variations in the studied period, mainly, in the dunes, sea terraces, variation of the shore line and tidal flat, evidencing the largest transformations in the temporary space between 1988 and 2001. The analyses of the beach profiles showed a sedimentation tendency in the area of the profiles P1, P2 and P3, however in the monitored pediod, it was observed in the referred profiles, erosive and depositionals intervals evidencing a need of more effective monitoring. The results of the granulometric analyses indicate a predominance of mean to coarse sand in the backshore and estirancy area, as in the shoreface, the analyses indicated medium to fine sand. The morfodynamic state, showed that beach of Minhoto is intermediate state, with alternancy to reflective. The areas of larger vulnerability and sensibility are the tidal flat, shore line, barrier island and mobile dunes, that actually is suffering great environmental impact with expansion of the carcinoculture, urban presence and natural impacts (erosion of the shoreline) / O trabalho versa sobre o estudo evolutivo das condi??es ambientais da regi?o costeira de Guamar?-RN, onde foi investigada a transforma??o geoambiental ocorrida nesta regi?o, cuja finalidade primordial foi diagnosticar as mudan?as verificadas no espa?o temporal de cinco d?cadas (1950 a 2000). Com objetivo de avaliar a a??o dos processos costeiros atuantes (correntes, ondas, mar?s e ventos), a fim de compreender os mecanismos geradores da eros?o e sedimenta??o, evidenciadas por constantes mudan?as morfol?gicas. O procedimento metodol?gico adotado consistiu em uma sucess?o de etapas envolvendo levantamento bibliogr?fico e cartogr?fico, fotointerpreta??o, tratamento digital de imagens, levantamento de campo (coleta de amostra, perfis praiais, caracteriza??o do ambiente praial e hidrodin?mica), corre??o de mapeamento e an?lises laboratoriais (granulometria). O estudo evolutivo das fei??es morfol?gicas indicou varia??es significativas no per?odo estudado, principalmente, nas dunas, terra?os marinhos, varia??o da linha de praia e plan?cie de mar?, evidenciando as maiores transforma??es no espa?o temporal entre 1988 e 2001. As an?lises dos perfis de praia mostraram uma tend?ncia sedimenta??o na ?rea dos perfis P1, P2 e P3, entretanto, no per?odo monitorado, observou-se nos referidos perfis, intervalos erosivos e deposicionais evidenciando uma necessidade de monitoramento por um per?odo maior. Os resultados das an?lises granulom?tricas indicam uma predomin?ncia de areia m?dia a grossa no p?s-praia e zona de estir?ncio, quanto na antepraia, as an?lises indicaram areia media a fina. O estado morfodin?mico, mostrou que a praia do Minhoto encontra-se em estado intermedi?rio, com altern?ncia a reflectivo. As ?reas de maior vulnerabilidade e sensibilidade s?o as plan?cies de mar?, linha de praia, ilha barreira e dunas m?veis, que atualmente v?m sofrendo grande impacto ambiental com expans?o da carcinicultura, presen?a urbana e impacto natural (eros?o da linha de praia)