논문 상세보기
pp.126-129
Flood and scour are one of the major causes of bridge collapse. However, maintenance and inspection techniques still need improvements especially for underwater structures like bridge piers. Conventionally, manual inspection by divers has been carried out for underwater structures of bridges. This has difficulties in gathering accurate and reliable field data under severe environmental conditions. For this reason, underwater inspection is carried out using Side Scan Sonar(SSS) recently. The underwater structure image can be obtained by observing the reflected beam signal from underwater riverbed and surface. Signal and image processing techniques are employed in order to produce a clearer 2D image. Conventional inspection using one Side Scan Sonar is carried out to obtain river bed and underwater structure image. In order to reduce the inspection time, two Side Scan Sonar are used to obtain river bed and underwater structure image simultaneously. Two Side Scan Sonar were used to confirm the usability of the interference effects, which can occur by using the same frequency as the image at the time of collection, through indoor experiment for verification.
