Hydraulic factors account for a large part of the causes of bridge collapse. Due to the\nnature of the underwater environment, quick and accurate inspection is required when damage\noccurs. In this study, we developed a 2 MHz side scan sonar sensor module and effective operation\ntechnique by improving the limitations of existing sonar. Through field tests, we analyzed the\ncorrelation of factors affecting the resolution of the sonar data such as the angle of survey, the\ndistance from the underwater structure and the water depth. The effect of the distance and the water\ndepth and the structure on the survey angle was 66~82%. We also derived the relationship between\nthese factors as a regression model for effective operating techniques. It is considered that\napplication of the developed 2 MHz side scan sonar and its operation method could contribute to\nprevention of bridge collapses and disasters by quickly and accurately checking the damage of\nbridge substructures due to hydraulic factors.
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