DEGEO - Departamento de Geologia
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/8
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Resultados da Pesquisa
Item Estimating groundwater resources of the Içá-Solimões Aquifer System in the Urucu Oil Province Central Amazon Region, Brazil, focused on a balance between availability and water demand.(2020) Galvão, Paulo Henrique Ferreira; Faria, Eliene Lopes; Demetrio, José Geilson Alves; Baessa, Marcus Paulus MartinsHydrogeologic information is still scarce in the Amazon region being required more studies for improving the understanding of local hydrogeologic contexts. The goal of this paper, focused on the Urucu Oil Province, Brazilian Central Amazon, is to quantitatively estimate groundwater resources of the Içá-Solimões Aquifer System (ISAS) in the region. The work focuses on a balance between availability and water demand, considering current and future uses, contributing to a sustainable and integrated use of groundwater. Cartographic, lithologic and geophysical logs were analyzed coupled with ISAS hydraulic data (transmissivity, hydraulic conductivity, and storativity) and its local aquifer geometries, as well as the potentiometric surface map to estimate values of total and renewable groundwater resources, sustainable yields, and well-field facility capacities. Results showed the portion of the Içá-Solimões Aquifer System has a total groundwater resource of 0.45 km3. As there is a groundwater consumptive projection to 2050 close to 2.7 x 10-3 km3 yr–1 and the aquifer system has a sustainable yield of 3 x 10-3 km3 yr–1, the current resource allocation for future consumption rate appears to be sustainable.Item Geometry and water quality of the unconfined aquifer near the Piracicaba river, Ipatinga/MG, Brazil.(2019) Oliveira, Débora Almeida de; Galvão, Paulo Henrique FerreiraGroundwater is the main source of drinking water for the city of Ipatinga/MG, Brazil. However, there is a lack of study about hydrogeology in the region, as well as indications of quality alterations of water resources. The goal is to understand the hydrogeology surrounding the COPASA's Water Treatment Plant and the Piracicaba river areas, where the main water supply wells are located. Maps of potentiometric surface, isobaths and isopachs, hydrogeological cross-section, aquifer pumping tests, and physicochemical analysis interpretations were performed. Results indicate the aquifer is unconfined, with high transmissivity and hydraulic conductivity values, which explain the high values of discharge in the wells. The Piracicaba river can be considered as influent, with its water flow converging to the aquifer. Groundwater shows chemical parameters at low levels, according to Brazilian drinking-water quality guidelines, with local presence of aluminum, iron, and manganese, requiring only conventional treatment processes before distributionItem Recharge sources and hydrochemical evolution of an urban karst aquifer, Sete Lagoas, MG, Brazil.(2017) Galvão, Paulo Henrique Ferreira; Hirata, Ricardo; Halihan, Todd; Terada, RafaelThe current water supply for the city of Sete Lagoas, Brazil, is almost entirely groundwater from the Sete Lagoas Karst Aquifer, with a small contribution from a fractured-basement rock aquifer. Characterizing the hydrogeologic processes is important for proper water resource management, avoiding contamination and other future issues. The main goal of this study is to identify active hydrogeological processes, such as possible surface– ground water interactions, sources of recharge, and the hydrochemical evolution of groundwater through the use of stable isotopes 18O and 2H and major ion data. The groundwater samples were collected from the karst aquifer (central urban area) and from the fractured aquifer (southern part of the city). Surface water samples were collected from the seven main lakes, and rainwater was sampled over a period of one year. The stable isotope results indicated the groundwater origin is directly from local precipitation, having a limited recharge period, and locally receiving surface water contributions. Groundwater quality in the central urban area may be influenced by surface water infiltration where the karst aquifer is in contact with overlying unconsolidated sediments. Some samples with nitrate concentration of 10 mg/L or higher indicates the natural composition of the groundwater has been altered by urban sewage contamination. The highest concentrations of major ions were found in the central region, where the most karstified area from the Sete Lagoas Formation is located. These data suggest a longer residence time for this water, indicating more mineralization, in accordance with the geological information.Item Hydrographic and hydrogeological Basin of Entre-Ribeiros : probable recharge zone delimitation and environmental impact assessment.(2012) Vasconcelos, Vitor Vieira; Martins Júnior, Paulo Pereira; Hadad, Renato MoreiraApresenta-se uma proposta de delimitação das prováveis zonas de recarga da Bacia Hidrográfica de Entre-Ribeiros (Noroeste de Minas Gerais/Brasil). A delimitação teve como subsídio estudos de litoestratigrafia, geomorfologia, unidades geoambientais e hidrogeologia. A partir da delimitação proposta, e conjugando-se à análise da ocupação do solo entre o período de 1975 a 2008, procura-se identificar as tendências de ocupação das zonas prováveis de recarga. Por fim, tecem-se comentários sobre os impactos ambientais decorrentes da ocupação dessas áreas.Item Aquifer recharge : epistemology and interdisciplinarity.(2013) Vasconcelos, Vitor Vieira; Martins Júnior, Paulo Pereira; Hadad, Renato Moreira; Koontanakulvong, SucharitThe environmental issues related to aquifer recharge and discharge present challenges that require an interdisciplinary approach. This paper reports an epistemological study on the contribution of different fields of knowledge to the research on hydrogeological processes. The study is based on the hypothesis that this dialog is essential to the resolution of current and future environmental problems, including those related to water use. The first proposition is to discuss epistemological and information management approaches that may contribute to a better spatial, qualitative and quantitative characterization of aquifer recharge. Preliminary conceptual models are developed to demonstrate the possibilities of interdisciplinary collaboration to solve the environmental issues presented here. The paper concludes with a discussion of the possibilities of incorporating knowledge on aquifer recharge into environmental and water resources policies.