Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-02-20T22:47:57Z No. of bitstreams: 1 AryaneLeonidioDoCarmoAssuncao_DISSERT.pdf: 6383259 bytes, checksum: 56d6226f2aa40df6803e5e997583ffab (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-02-24T19:48:01Z (GMT) No. of bitstreams: 1 AryaneLeonidioDoCarmoAssuncao_DISSERT.pdf: 6383259 bytes, checksum: 56d6226f2aa40df6803e5e997583ffab (MD5) / Made available in DSpace on 2017-02-24T19:48:01Z (GMT). No. of bitstreams: 1 AryaneLeonidioDoCarmoAssuncao_DISSERT.pdf: 6383259 bytes, checksum: 56d6226f2aa40df6803e5e997583ffab (MD5) Previous issue date: 2016-08-29 / A ?rea de estudo est? inserida na bacia hidrogr?fica do rio Pirangi, localizada no litoral Oriental do Estado do Rio Grande do Norte, e abrangendo 370 km? na regi?o do munic?pio de Parnamirim. Essa ?rea apresenta um alto potencial hidrogeol?gico, cujos recursos h?dricos j? vem sendo bastante explotados no decorrer dos anos. O objetivo principal do trabalho, tendo em vista a import?ncia e crescente utiliza??o desse recurso, ? caracterizar a qualidade dessas ?guas subterr?neas e diagnosticar modifica??es hidroqu?micas ocorridas a partir do desenvolvimento de atividades urbanas e agr?colas na regi?o. Nesse sentido, foi desenvolvida inicialmente uma avalia??o de uso e ocupa??o do solo em toda a ?rea, identificando as atividades existentes e que possam influenciar na contamina??o das ?guas. A partir dessas caracter?sticas dividiu-se a ?rea de estudo em tr?s sub?reas, de modo a comparar a situa??o hidroqu?micas das ?guas entre elas. Para o reconhecimento hidrogeoqu?mico, a partir de rede de monitoramento definida, foram realizadas visitas de campo para coleta de amostras para an?lise qu?mica, a fim de interpretar a situa??o do Sistema Aqu?fero Dunas-Barreiras. Com isso, obtiveram-se dados de condutividade el?trica, STD, c?tions principais (s?dio, c?lcio, magn?sio e pot?ssio), ?nions principais (cloreto, sulfato e bicarbonato), ferro, pot?ssio, carbonato, nitrato, am?nia, boro, pH, e dureza total; interpretou-se os resultados das an?lises atrav?s de m?todos estat?sticos, mapas hidroqu?micos e diagramas de Piper e Durov Expandido; e foi realizado um estudo de qualidade das ?guas subterr?neas para determinados usos. A f?cies hidroqu?mica que predomina na ?rea de estudo foi reconhecida como cloretada s?dica. Os resultados obtidos indicam que as ?guas subterr?neas apresentam, em geral, uma boa qualidade, com baixa salinidade. Contudo, identifica-se uma tend?ncia ? contamina??o oriunda da por??o norte da ?rea, mais pr?xima ao centro do munic?pio de Parnamirim, e que vem passando por processos de expans?o urbana nos ?ltimos anos. Ocorre tamb?m essa tend?ncia nas por??es em que h? cultivo de lavouras e pecu?ria, a oeste da ?rea. A por??o leste da ?rea, sub?rea que engloba sistemas de lagoas e dunas, ? a que possui as ?guas subterr?neas com menores salinidades e, consequentemente, qualidade mais preservada. Essas constata??es indicam que a dire??o de diminui??o de salinidade das ?guas (em dire??o a leste) segue a dire??o do fluxo subterr?neo. / The study area is inserted in the hydrographic basin of Pirangi river, located in the west coast of Rio Grande do Norte state, covering 370 km? in the Parnamirim region. The area presents a high hydrogeological potential, whose water resources has been widely exploited over the years. The main objective of this dissertation, considering the importance and increasing use of this resource, is characterize the groundwater quality and diagnose hydrochemical changes due the urban development and agriculture in the region. In this sense, it was initially made an assessment of use and land occupation in the whole area, identifying existing activities and the might influence water contamination. Based on these characteristics, the study area was divided in three subareas, to compare the hydrochemical situation between them. For the hydrogeochemical recognition in the defined monitoring network, it was performed field work to collect samples for chemical analysis, in order to interpret the situation of the Dunas-Barreiras Aquifer System. Therewith, many measurements were obtained such as electrical conductivity, total dissolved solids, major cations (sodium, calcium and magnesium), major anions (chloride, sulfate and bicarbonate), iron, potassium, carbonate, nitrate, ammonia, boron, pH, and total hardness; the analysis results were interpreted using statistical methods, hydrochemical maps and Piper and Expanded Durov diagrams; and a study of groundwater quality was conducted for certain uses. The hydrochemical facies that prevails in the study area is sodium chlorinated. The results indicate that the groundwater have generally good quality with low salinity. However, there is a tendency to contamination originating from the northern part of the area, closer to the center of Parnamirim city, which has been undergoing urban expansion processes in the last years. The same tendency is seen in the portions which are agricultural crops and livestock, in the western area. The east portion of the area, subarea which comprises ponds and dunes systems, is the one with lower salinity levels and, therefore, more preserved quality. These findings indicate that the direction in the decreasing of water salinity (towards east) follows the direction of the groundwater flow.