| Revista: | Revista brasileira de geofisica |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000338725 |
| ISSN: | 0102-261X |
| Autores: | Taioli, Fabio1 Gallas, Jose Domingos Faraco1 Ribeiro, Vilmondes2 Iezzi, Patricia Braga Toledo1 Nascimento, Diego Potomati Vaccaro1 |
| Instituciones: | 1Universidade de Sao Paulo, Instituto de Geociencias, Sao Paulo. Brasil 2Instituto de Pesquisas Tecnologicas do Estado de Sao Paulo, Sao Paulo. Brasil |
| Año: | 2006 |
| Periodo: | Oct-Dic |
| Volumen: | 24 |
| Número: | 4 |
| Paginación: | P-P |
| País: | Brasil |
| Idioma: | Portugués |
| Tipo de documento: | Artículo |
| Enfoque: | Aplicado, descriptivo |
| Resumen en inglés | The evaluation of soil and groundwater contamination has been an important task in the geosciences field and pushing on the methodological improvement. The contamination extension is normally investigated using geophysical methods or boreholes and chemical analysis. Otherwise, several contamination problems are at low depths (less than 0.5m) allowing the easy access to the contaminated region. Therefore, a low-cost and simple system (mini-probe Wenner) was developed and tested and it is aimed at low depth resistivity measurements. The system is formed by a current source (AC) and a PVC probe which contains a Wenner array with a electrode spacing of 1 cm. Laboratory tests show that the current source works adequately in the resistance range normally associated with contaminated materials while the system tests (including the current source and probe) indicated apparent resistivity values very similar to the resistivity values calculated using the equation proposed by Archie, in the 1.5 to 57 m interval. Preliminary field tests showed that the mini-probe is easily applicable in sandy and sand-silty soils while in clayey or hard soils is difficult its introduction. Therefore, interesting applications to the proposed system are the study of agricultural areas or the study of contamination in predominantly sandy lithologies |
| Resumen en portugués | O estudo e avaliacao de contaminacoes do solo e/ou agua subterranea tem sido uma das grandes preocupacoes na area de geociencias, exigindo constante desenvolvimento metodologico. A definicao da extensao da contaminacao e normalmente efetuada por metodos indiretos, particularmente os geofısicos (eletroresistividade, eletromagnetico e GPR), e por metodos diretos (sondagens, pocos de monitoramento, analises quımicas etc.). No entanto, muitos dos problemas de contaminac¸ao sao bastante rasos (menos de 0,5 metro de profundidade) permitindo o facil acesso a regiao contaminada. Neste sentido foi desenvolvido e testado um sistema simples (mini-sonda Wenner) e de baixo custo para medidas de resistividade in-situ a pequenas profundidades |
| Disciplinas: | Geociencias |
| Palabras clave: | Geofísica, Electrorresistividad, Contaminación, Minisonda, Salinización |
| Keyword: | Earth sciences, Geophysics, Electroresistivity, Contamination, Mini-probe, Salinization |
| Texto completo: | Texto completo (Ver PDF) |
