| Journal: | Revista brasileira de geofisica |
| Database: | PERIÓDICA |
| System number: | 000338730 |
| ISSN: | 0102-261X |
| Authors: | Braga, Antonio Celso de Oliveira1 Malagutti-Filho, Walter1 Dourado, Joao Carlos1 |
| Institutions: | 1Universidade Estadual Paulista "Julio de Mesquita Filho", Departamento de Geologia Aplicada, Rio Claro, Sao Paulo. Brasil |
| Year: | 2006 |
| Season: | Oct-Dic |
| Volumen: | 24 |
| Number: | 4 |
| Pages: | 573-581 |
| Country: | Brasil |
| Language: | Portugués |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | Resistivity (DC) method using vertical electrical soundings (Schlumberger array) are conducted in the vicinity of Canoas/RS, applied to environmental studies with the objective of investigating groundwater conditions. The present paper shows a geoelectrical identification of the lithology and an estimate of the relationship between the resistivity and Dar Zarrouk parameters (transverse unit resistance and longitudinal unit conductance) with the properties such as aquifer transmissivity and protection of ground water resources. In the saturated sediments, resistivity values defined the following sequence: clay layers (resistivity< 40 ohm-m) and sand layers (resistivity ≥ 40 ohm-m). Two sand layers were identified; one corresponding to the unconfined aquifer and another to the confined aquifer between two clay layers. In the map of the transverse unit resistance of the unconfined aquifer, the tendencies of high values can be associated with the zones of high transmissivity; hence, these zones are suggested for the installation of monitoring wells. The map of longitudinal conductance illustrates the impermeability of the confining clay layer. Values of S > 1.0 siemens would indicate zones in which the confined aquifer would be protected; in comparison, values of S < 1.0 siemens would indicate zones of probable risks of contamination |
| Portuguese abstract | Ensaios pelo metodo da eletrorresistividade, tecnica de campo da sondagem eletrica vertical (Schlumberger array) foram executados no municıpio de Canoas/RS. Esses ensaios tiveram como objetivo principal obter um diagnostico do lenc¸ol freatico em areas de Refinaria – REFAP/PETROBRAS. Este trabalho apresenta uma identificacao geoeletrica da litologia e uma estimativa da relacao entre a resistividade e parametros de Dar Zarrouk (resistencia transversal unitaria e condutancia longitudinal unitaria) com as propriedades transmissividade e protecao frente a contaminantes dos aquıferos |
| Disciplines: | Geociencias |
| Keyword: | Geofísica, Resistividad, Parámetros Dar Zarrouk, Acuíferos, Brasil |
| Keyword: | Earth sciences, Geophysics, Resistivity, Dar Zarrouk parameters, Aquifers, Brazil |
| Full text: | Texto completo (Ver PDF) |
