Made available in DSpace on 2015-03-13T17:08:22Z (GMT). No. of bitstreams: 1 AdrianoLAM_Introducao_ate_Cap3.pdf: 1542020 bytes, checksum: acc2a954ad78e8e953630472a4fb07e5 (MD5) Previous issue date: 2001-04-25 / This work embraces the application of Landsat 5-TM digital images, comprising August 2 1989 and September 22 1998, for temporal mapping and geoenvironmental analysis of the dynamic of Piranhas-A?u river mouth, situated in the Macau (RN) region. After treatment using several digital processing techniques (e.g. colour composition in RGB, ratio of bands, principal component analysis, index methods, among others), it was possible to generate several image products and multitemporal maps of the coastal morphodynamics of the studied area. Using the image products it was possible the identification and characterization of the principal elements of interest (vegetation, soil, geology and water) in the surface of the studied area, associating the spectral characteristics of these elements to that presented by the image products resulting of the digital processing. Thus, it was possible to define different types of soils: Amd, AQd6, SK1 and LVe4; vegetation grouping: open arboreal-shrubby caatinga, closed arborealshrubby caatinga, closed arboreal caatinga, mangrove vegetation, dune vegetation and areas predominately constituted by juremas; geological units: quaternary units beach sediments, sand banks, dune flats, barrier island, mobile dunes, fixed dunes, alluvium, tidal and inundation flats, and sandy facies of the Potengi Formation; tertiary-quaternary units Barreiras Formation grouped to the clayey facies of the Potengi Formation, Macau Formation grouped to the sediments of the Tibau Formation; Cretaceous units Janda?ra Formation; moreover it was to identify the sea/land limit, shallow submersed areas and suspended sediments. The multitemporal maps of the coastal morphodynamics allowed the identification and a semi-quantitative evoluation of regions which were submitted to erosive and constructive processes in the last decade. This semi-quantitative evoluation in association with an geoenvironmental characterization of the studied area are important data to the elaboration of actions that may minimize the possible/probable impacts caused by the implantation of the Polo Gas/Sal and to the monitoring of areas explorated by the petroleum and salt industries / Este trabalho trata da aplica??o dos dados das imagens digitais do Landsat 5-TM, dos per?odos de 02/08/1989 e 22/09/1998, na cartografia temporal e an?lise geoambiental da din?mica da Foz do Rio Piranhas-A?u, na regi?o de Macau-RN. Essas imagens, ap?s serem submetidas a diversas t?cnicas de processamento digital (composi??o colorida em RGB, raz?o entre bandas, an?lise por principais componentes, m?todos de ?ndices, entre outros) proporcionaram a gera??o de diversos produtos imagem e de mapas multitemporais da morfodin?mica costeira da ?rea de estudo. Por meio dos produtos imagem foi poss?vel realizar a identifica??o e caracteriza??o dos principais elementos de interesse contidos na superf?cie da ?rea estudada (vegeta??o, solo, geologia e ?gua), associando as caracter?sticas espectrais destes ?quelas apresentadas nos produtos imagem resultantes dos processamentos digitais. Desta forma foi poss?vel definir os diferentes tipos de solos: Amd, AQd6, SK1 e LVe4; agrupamentos de vegeta??o: caatinga arbustiva-arb?rea aberta, caatinga arbustiva-arb?rea fechada, caatinga arb?rea fechada, vegeta??o de mangue, vegeta??o de dunas e ?reas constitu?das prodominantemente por juremas; unidades geol?gicas: unidades quatern?rias sedimentos quartzo-arenosos de praias, restingas, pisos de dunas, ilha barreira, dunas m?veis, dunas fixas, aluvi?es, plan?cies de mar? e de inunda??o, f?cies arenosa da Forma??o Potengi - ; unidades t?rcioquatern?rias Forma??o Barreiras agrupada ?s f?cies argilosas dos sedimentos terci?rios da Forma??o Potengi, sedimentos da Forma??o Tibau agrupados aos basaltos e diab?sios terci?rios da Forma??o Macau - ; unidade cret?cea Forma??o Janda?ra; al?m de identificar o limite terra/mar, ?reas submersas rasas e sedimentos em suspens?o. Os mapas multitemporais da morfodin?mica costeira permitiram a identifica??o e uma avalia??o semi-quantitativa das regi?es que foram submetidas a processos erosivos e construtivos nessa ?ltima d?cada. Essa avalia??o semi-quantitativa associada a caracteriza??o geoambiental da ?rea estudada, representam, desta forma, importantes dados para elabora??o de medidas que possam minimizar os poss?veis/prov?veis impactos a serem causados com a implanta??o do P?lo G?s-Sal e para o monitoramento das ?reas de explora??o das ind?strias do petr?leo e do sal