Processamento de dados de GPR em barras fluviais do Rio Camaquã, e sua influência na geração de imagem

Abstract

During the last decades GPR has been an important geophysical method to assist sedimentological studies in order to reconstruct the depositional environments of the past and the nature of the sedimentary processes in a variety of environments. With adequate data acquisition and processing, in view of the peculiarity of each problem, it is possible to obtain a coherent image, making easier the understanding of the depositional geometry of fluvial rods. This work aimed to implement a GPR data processing routine in a river bar of the Camaquã River in order to obtain an improvement of the images, thus contributing to an improvement in interpretation. For this procedure was used data collected in the locality of Passo do Cação the banks of the Camaquã River natural border between the municipalities of Bagé and Caçapava do Sul For the processing steps of the radar data, the Reflex® and Prism® sotwares were used. The results of the processing routine implemented for the radar lines showed a substantial improvement in the reflection data visualization as well as the interpretation of the main subsurface depositional features and geometries. From the recognition and interpretation of the lines, it was possible to characterize five radarfacies for the lines: clinoforms, subparalelas, chaotic channel filling, high vertical fill angle and hyperboles.