현재 K-water의 관리하고 있는 시설물은 그 중요도에 따라서 정밀안전진단 등 법적인 점검뿐만 아니라 자체점검 등을 수행하며 안전관리에 만전을 기하고 있다. 현재는 수중조사장비의 기술적 한계로 육안 조사를 위한 인력잠수에 의존하고 있어 인명사고 위험 및 조사범위의 한계 등의 문제점을 안고 있다. 미국, 일본 등의 해외에서는 이러한 문제점을 극복하기 위해 수중 ROV를 이용한 수중조사 및 점검 기술의 도입을 적극적으로 추진하고 있으며 K-water에서도 수중 ROV를 활용한 댐체 및 보 구조물에 대한 수중점검기술을 도입하고자 연구를 현재 수행 중에 있다.

There are currently using widly and universally underwater inspection of based on SONAR around world. Understand the principles od SONAR’s ultrasonic for disaster prevention of underwater structures and though indoor test it could try consideration with respect to the characteristics of the ultrasonic frequency.

A filming technique using Side Scan SONAR should be varied upon condition in order to obtain high-resolution data. Because the theoretical measurement scope is different from the actual measurement scope. It is possible to obtain the accurate data only after adjusting the water depth, distance from a structure and emission angle. Via the multiple regression analysis of data accumulated through field experiments and relations of 3 variables, and equation was devised.

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.

Damages due to typhoon and floods are increasing as a result of global warming and abnormal climate phenomenon over the world. Flood and scour is one of the major causes for bridge collapse. However, maintenance and inspection techniques still need improvements especially for underwater structures like bridge piers in rivers. 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. Therefore, in this study, underwater inspection of bridges has been carried out using the side scan sonar (SSS), one of unmanned underwater inspection equipment. Compared to the conventional manual inspection, it has been found that the SSS can be efficiently utilized to underwater inspection of bridges especially with bad visibility or large-scale inspection area.