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Filho W.S.,Instituto Geologico IG SMA SP | Ferrari J.A.,Instituto Geologico IG SMA SP | Hiruma S.T.,Instituto Geologico IG SMA SP | Sallun A.E.M.,Instituto Geologico IG SMA SP | Karmann I.,Institute Geociencias IGc USP
Revista Escola de Minas | Year: 2010

Located in the valleys of the Ribeira de Iguape and Paranapanema Rivers, where karst features and a large number of caves can be found, the Intervales State Park and its buffer zone lie within an area of Proterozoic carbonate rocks that are of great interest to the mining industry. Based on geomorphological and geological studies, the characterization of the karst was performed in order to develop a management plan for the Intervales State Park and its buffer zone. With this, it was possible to define the degree of vulnerability of the karst aquifer to contamination. The areas of greatest vulnerability are those that facilitate injection of contaminants directly into the aquifer, being characterized by such karst features as caves and sinks. In regions where recharge occurs exclusively via diffuse infiltration, and runoff convergence with surface watercourses, the degree of vulnerability is lower. Considering this analysis, areas with the greatest impact potential were identified and recommendations made regarding management of the park and its buffer zone.

Cardoso D.,HIDROPLAN | Riedel P.S.,Claro | Vedovello R.,Instituto Geologico IG SMA SP | Brollo M.J.,Instituto Geologico IG SMA SP | Tominaga L.K.,Instituto Geologico IG SMA SP
Pesquisas em Geociencias | Year: 2010

This paper presents a method applied to the seacoast town of Peruibe, São Paulo State, Brazil. The method encompasses the application of remote sensing interpretation techniques and field survey to obtain geotechnical data and thus generate cartographic products composed of easily grouped units that work as database objects and can de used to assist geotechnical zoning. The so-called Compartmentalization Basic Units (CBUs) show the smallest land surface analyzed from its physiographic elements and have in their cores the same geotechnical properties, making it easier to analyze the potentialities and the fragilities of the physical environment and its susceptibility to the action of natural and anthropic processes. In the study area, sixty-eight units were individualized in which geotechnical properties were inferred by photo interpretation criteria, using textural properties of the image adjusted with field observations. The method proved to be easily reproducible, and is especially useful in regions where the absence of basic maps makes it impossible to establish homogeneous zones through traditional overlay of different topic informations.

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