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| Bourotte,Christine; Bertolo,Reginaldo; Almodovar,Marta; Hirata,Ricardo. |
| Anomalous concentrations of hexavalent chromium have been detected in ground-water of the Adamantina Aquifer inat least 54 municipalities located in the northwestern region of the State of São Paulo, southeast Brazil, occasionallyexceeding the permitted limit for human consumption (0.05 mg.L-1). An investigation was conducted in the municipality of Urânia, where the highest concentrations of chromium were detected regionally. It was defined that the originof this contamination is natural, since high concentrations of chromium were detected in aquifer sandstones (averageof 221 ppm) and also in pyroxenes (6000 ppm), one of the main heavy minerals found in the sediments. Besides, noother possible diffuse or point sources of contamination were observed in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chromium; Ground-water; Aquifer; Natural contamination. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000200009 |
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| Luque Rodríguez, Rosa Imelda. |
| El monitoreo del nivel de las aguas subterráneas, provee de importante información para la caracterización del abatimiento, incremento o estabilización de los volúmenes del agua subterránea en una región. Los cambios en los niveles de agua subterránea son provocados por los patrones de consumo de agua, las afectaciones en la recarga y los factores climáticos; la identificación y cuantificación de estos cambios son indispensables para el manejo sustentable de este recurso. En este estudio se evaluó el comportamiento del nivel y la distribución de él agua subterránea en el área del distrito de riego 038 rio Mayo, Sonora, México, para el periodo del año 1997 a 2011; mediante la construcción e integración de mapas de isolineas del cambio y la distribución de... |
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Palavras-chave: Monitoreo de nivel estático; SIG; Mapa de isolíneas; Acuífero; Static level monitoring; GIS; Maps of isolines; Aquifer; Hidrociencias; Maestría Tecnológica. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1850 |
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| Tapsuwan, Sorada; Ingram, Gordon; Brennan, Donna C.. |
| Up to 60% of potable water supplied to Perth in Western Australia is extracted from the Gnangara mound. Many of the urban wetlands above the Mound are groundwater-dependent. Excessive groundwater extraction and climate change have resulted in a decline in water levels in the wetlands. This study estimates the value of urban wetlands in three local government districts in the Perth metropolitan region using the hedonic property price approach. Preliminary results found that proximity to wetlands influences the sales prices of properties. The marginal implicit price of reducing the distance to the nearest wetland by 1 metre, evaluated at the mean sales value, is AU$463. If there is more than one wetland within 1.5 kilometres of a property, the second wetland... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Groundwater; Housing development; Aquifer; Marginal implicit price; Land Economics/Use. |
| Ano: 2007 |
URL: http://purl.umn.edu/10418 |
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| Souza,Eliana de; Pontes,Lucas Machado; Fernandes Filho,Elpídio Inácio; Schaefer,Carlos Ernesto Goncalves Reynaud; Santos,Eliana Elizabet dos. |
| ABSTRACT: Little is known about the groundwater recharge potential of weathered tropical catchments, where increasing water uptake is widespread to meet various water demands. This study aimed to estimate the volume of groundwater recharge of the Doce River Basin, Minas Gerais, Brazil. The BALSEQ model was applied to calculate the water balance over a period of two years (2007-2009). Evapotranspiration, runoff, and potential groundwater recharge (PGR) were calculated, using daily data on rainfall, potential evapotranspiration, and plant-available water. A soil survey was undertaken for all major soils occurring in the basin. Soils samples were used to determine hydraulic conductivity, bulk density, and water content at field capacity and at the permanent... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquifer; Infiltration; Potential recharge; Random Forests Model; Water balance. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100501 |
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