Geofísica elétrica na caracterização da hidrologia subterrânea na região do Aterro Metropolitano Centro, Salvador, Bahia

Cavalcanti, Susana Silva; Sato, Hédison Kiuity; Lima, Olivar A. L. de

doi:10.1590/s0102-261x2001000200004

Cited by 5 publications

(2 citation statements)

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“…The resistivity values between 1 and 40 Ωm might be related to high salinity in acid mine drainage flows, caused by sulfides oxidation and acidification and dissolution of metals within the rock mass. The increase in salinity in aquifers due to contribution of pollutants is characterized by expressive decrease in the resistivity values when compared to natural streams [60][61][62][63].…”

Section: Resultsmentioning

confidence: 99%

Structural analysis and geophysical survey for hydrogeological diagnosis in uranium mine, Poços de Caldas (Brazil)

et al. 2019

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The implementation of open pit mines promotes alterations on geological and hydrogeological processes, mainly on natural streamflow patterns. Drainage system tries to reach its equilibrium due to modification on slope profiling water flows through new pathways contributing to erosion and leaching processes. One of the impacts related to mining is the generation of acid mine drainage (AMD), which occurs as a product of sulfide minerals exposure to oxidizing environment and, in contact to water, favors the formation of sulfuric acid. Thus, a low pH promotes a higher mobility of heavy metals and radionuclides, which become a source of contamination. In order to understand the hydrogeological dynamic in rock masses that contribute to AMD production, this paper aimed to subsidize mitigation programs in fractured aquifers using a structural analysis and geophysical survey for the reduction of acid drainage generation. The study was carried at the four mining fronts that compose the mine pit of Osamu Utsumi Mine, named according to its cardinal position (NE, SE, SW and NW). Local structural survey indicated that fractures attitudes are mainly N20E/80NW and N55 W/75NE, with intersections between them. Evidence of water flows, like whitish kaolinite stains and small vegetation growth, was identified in fronts NE, SW and NW, in addition to water springs at the base of the slopes. The flows arise mainly in areas that coincide to intersection between fracture systems in an orthogonal arrangement and the fracturing pattern indicated that at all fronts most of the fracture planes project into the open pit area, which favor the water channeling to the center of the mine as a water catchment basin. Moreover, the relationship between the persistence and spacing among the discontinuities enables a good hydraulic conductivity within the rock masses and the water upwelling on the slopes surface. The geophysical data corroborated with the structural survey, which identified the fracture planes as linear structures associated with low resistivity zones. DC resistivity method showed a strong contrast between saturated zones, differing natural from acidic water. Delimitation of linear features in the inversion models indicated that water flows are channeled through fracture planes and promote an expressive weathering process inside the rock masses, observed at depths of up to 70 m.

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Section: Resultsmentioning

confidence: 99%

Structural analysis and geophysical survey for hydrogeological diagnosis in uranium mine, Poços de Caldas (Brazil)

et al. 2019

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“…Estudos Geofísicos As investigações geofísicas são métodos de estudo indiretos, onde a partir de medições de grandezas físicas na superfície ou acima da superfície do terreno, é possível a obtenção de informações das condições geológicas e hidrológicas subsuperficiais de forma rápida e a custos reduzidos (Cavalcanti et al 2001).…”

Section: Figura 3 -Ilustrações De Casos De Assimetria Entre Bacias Hiunclassified

Proposição de critérios para avaliação e delimitação de bacias hidrogeológicas

Arraes

Campos

2007

RBG

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Resumo A designação de "bacia hidrogeológica" ainda necessita ser complementada com relação aos aspectos de sua conceituação e aplicação. Um dos enfoques desprovidos de embasamento teórico e conceitual diz respeito aos critérios para definição dos limites das bacias hidrogeológicas e as relações com as bacias hidrográficas sobrepostas. A literatura técnica atualmente disponível a esse respeito é muito restrita e incompleta. Assim o objetivo do presente trabalho é contribuir com o conhecimento sobre as bacias hidrogeológicas, bem como caracterizar uma terminologia a ser utilizada para futuros estudos hidrogeológicos em áreas específicas. Dentre as principais técnicas aplicadas à delimitação das bacias hidrogeológicas destacam-se os estudos de piezometria, hidrologia, hidroquímica, ensaios de traçadores e geofísica, e, dentre suas principais aplicações e implicações podem ser citadas a gestão integrada dos recursos hídricos, o estudo de aqüíferos transfronteiriços, a definição do perímetro de proteção dos poços e o estudo de remediação de aqüíferos contaminados.Palavras-chave: bacias hidrográficas, bacias hidrogeológicas/subterrâneas, delimitação, gestão. Abstract Criteria to the determination and evaluation of hydrogeologic basinThe designation of the "hydrogeologic basin" terminology still needs to be complemented regarding the definition and application aspects. One of the approaches without theoretical and conceptual basement is related to the criteria for definition the boundaries of the hydrogeologic basins and the relationships with the overland watersheds. The available technical literature is very restricted and incomplete. Because of this, the objective of the present paper is to contribute with the knowledge on the hydrogeologic basins, as well as to characterize a terminology to be used for futures hydrogeologic studies. Potenciometric surfaces mapping, hydrology, hidrochemistry, tracing tests and geophysics are among the main applied techniques to the delimitation of the hydrogeologic basins. The integrated wate resource management, the study of borders aquifers, the definition of well protection perimeter and the remediation study on polluted aquifers are some of the cases where the knowledge of the hydrogeologic boundaries is very important.Keywords: watershed, hydrogeologic/groundwater basin, delimitation, management.1 -Instituto Geociências, Universidade de Brasília, Brasília, DF. E-mail: tassia.arraes@gmail.com 2 -Instituto Geociências, Universidade de Brasília, Brasília, DF. E-mail: eloi@unb.br INTRODUÇÃO Em estudos hidrológicos e de demais fenômenos do fluxo superficial, a unidade principal de investigação é a bacia hidrográfica (Rennó 2004). Dessa forma, muitos dos critérios utilizados para a delimitação da unidade hidrográfica são bem conhecidos e contam inclusive com modelos digitais já desenvolvidos que permitem, a partir da existência de curvas de nível, a delimitação automática das bacias e do sentido do escoamento superficial em qualquer ponto da poligonal da bacia (Rennó & Soares 2001)....

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Monitoramento temporal de contaminação por chorume usando métodos geoelétricos

Bortolin

Filho

2011

12th International Congress of the Brazilian Geophysical Society &Amp; EXPOGEF, Rio De Janeiro, Brazil, 15–18 August 2011

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Geofísica elétrica na caracterização da hidrologia subterrânea na região do Aterro Metropolitano Centro, Salvador, Bahia

Cited by 5 publications

References 3 publications

Structural analysis and geophysical survey for hydrogeological diagnosis in uranium mine, Poços de Caldas (Brazil)

Structural analysis and geophysical survey for hydrogeological diagnosis in uranium mine, Poços de Caldas (Brazil)

Proposição de critérios para avaliação e delimitação de bacias hidrogeológicas

Monitoramento temporal de contaminação por chorume usando métodos geoelétricos

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