GPR Data Processing Workflow for River Bridge Column Measurement Gunawan Handayani
1Laboratory of Earth Physics and Complex Systems Bandung Institute of Technology
Abstract
The dimension of a column of a river bridge is very important in Civil Engineering evaluation. But for an old bridge of a deep river, the Musi River of Palembang, the measurement of dimension columns became a problem. The built-in drawing was not available. The columns and the pile caps are under the water surface, which required the nondestructive test to determine the dimensions. We selected the Ground Penetrating Radar to carry out the measurements. After the measurements, we processed the GPR data. It needed trial and error to implement a data processing workflow to obtain an optimum image of sub-water surface columns. We start with: Move start time, Subtract-DC-shift. Subtract-mean (Dewow), Bandpass frequency filtering, and Background removal. Later we apply the multiple reflection suppression process, which dominates the image.
Keywords: Ground Penetrating Radar, river, old bridge
