Aplicação da metodologia de GPR (Radar de Penetração no Solo) com tratamento no programa Reflexw dos cordões cenozóicos da planície costeira de Itaguaí, Rio de Janeiro

Abstract

This research investigated the formation of sandstones located in the coastal plain region of Sepetiba, in Itaguaí, Rio de Janeiro State. The deposition sedimentary and the evolution of the coastal plain Sepetiba has been studied in the last three decades, mainly because it is an ancient environment of sandy deposits formed during the Holocene. In addition, diverse authors define the sediments as deposited at beaches originated with transgressive and/or regressive that peaked during the Quaternary. The methodology of Ground Penetrating Radar (GPR) was here used to study the coastal sandy environment. This geophysical technique has been used to examine characteristics such as: thickness of the sand deposits, the detection of the bedrock and to determinate the direction of progradation. This research also used the technique of ground penetrating radar to analyze the structures in the subsurface since the environment studied can be defined as the shoreline, the margins of lagoon, called Sepetiba Bay. In this work we realized a total of eleven (11) profiles, which have been processed with the software Reflex win. During data processing apply some filters, such as: subtract mean (dewow), bandpassfrequency and gains. And the much better images of radargramas have been realized using a 200 MHz antenna (channel 1) and an antenna 80 MHz In this case, obtained images of radargramas with high resolution to 25 meters depth. The results were used to build sections and their interpretations allowed to conclude that the studied sedimentary sequence was deposited in delta and shorelines Quaternary environments.