The study area is the Urucu Oil Province, Municipality of Coari, State of Amazonas, Brazil. This research represents a contribution to the hydrogeological knowledge in the northern region of Brazil, particularly in the central part of the Amazon rainforest, where researches on isotopic are still incipient. The primary goal was to determine, by stable isotopes 18 O and 2 H measurements, interrelationships between surface water and groundwater, in order to understand the origin and mechanisms of groundwater recharge and discharge. For this, samples of rainwater, superficial water and groundwater were collected between June 2008 and May 2009 for stable isotopic analyzes. This understanding is important in cases of eventual contaminations of the area, which could degrade the water resources. The results show that the superficial waters are typically light waters and have meteoric origin, and the groundwater recharge is by direct rainfall infiltration with primary evaporation before reaching the groundwater table in the Içá-Solimões Aquifer System. The isotopic signatures similarities between groundwater and superficial waters indicate both waters' contributions in the streams and, therefore, in the Urucu river.
ResumoAs águas subterrâneas desempenham um papel fundamental no ciclo da água na região Amazônica e constituem uma reserva expressiva de boa qualidade, podendo ser utilizadas para diversos fins. As informações hidrogeológicas em tal região são ainda muito escassas, restringindo-se apenas aos aquíferos dos depósitos do Cenozoico (formações Solimões e Alter do Chão), com estudos concentrados particularmente nas regiões de Manaus, no Amazonas, e de Belém, no Pará. Dessa forma, são necessários estudos hidrogeológicos sistemáticos que permitam caracterizar os aquíferos quanto à geometria, à produtividade, às condições de recarga, entre outros, possibilitando aperfeiçoar a explotação e o uso da água subterrânea, de modo a garantir sua sustentabilidade. O presente trabalho, desenvolvido na Província Petrolífera de Urucu, município de Coari, estado do Amazonas, teve como objetivo a caracterização hidrogeológica do Sistema Aquífero Içá-Solimões. O estudo revelou que este sistema possui espessura média de 50 m, com superfície convexa, revelada por meio do mapa de isóbatas. O fluxo da água subterrânea é em direção ao Rio Urucu (SSE/NNW), concordante com a superfície topográfica. Os valores médios de transmissividade, coeficiente de armazenamento e condutividade hidráulica foram de 3 x 10 -3 m 2 /s, 5 x 10 -4 e 1 x 10 -4 m/s, respectivamente. Concluiu-se que se trata de um aquífero do tipo livre-confinado, apresentando um bom potencial de explotação, sendo utilizado para abastecimento da província.Palavras-chave: caracterização hidrogeológica; Sistema Aquífero Içá-Solimões; água subterrânea. Abstract Hydrogeological and geometric characterization of the Iça and Solimões Formations in Urucu area, Amazonas state.Groundwater has a fundamental role in the water cycle in the Amazon region and constitutes a significant good-quality reserve of water, which can be used for various purposes. The hydrogeological information of this region are still very scarce, being restricted only to the aquifers of the Cenozoic deposits (Solimões and Alter do Chão Formations), with studies particularly concentrated in the region of Manaus, Amazonas State, and Belém, in Pará State. Thus, systematic studies are needed for analysis of the hydrogeological conditions, in order to optimize the exploitation and use of groundwater to ensure sustainability, as well as to characterize the aquifer geometry, productivity, recharge conditions, among others. This research was performed in Urucu Oil Province, Coari county, State of Amazonas, Brazil. The main objective was the hydrogeological characterization of the Içá-Solimões Aquifer System. The study showed that this system has a 50-meter average thickness, with a convex shaped geometry as revealed by isobaths mapping. The potentiometry showed that the behavior of the groundwater flow is consistent with the topographic surface, coming toward the river Urucu. The following average values of hydrogeological parameters were observed: transmissivity = 3 x 10 -3 m 2 /s, storage coefficient = 5 x 10 -4 , and hydrau...
Resumo -A área de estudo é a Província Petrolífera de Urucu, município de Coari/AM. A pesquisa contribui para o conhecimento hidrogeológico da região norte do Brasil, onde pesquisas sobre isotópos ainda são incipientes. O objetivo foi determinar, via isótopos estáveis
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