ABSTRACT

Song, D.S; Kim, G.Y., and Lee, J.L., 2016. Quantitative behaviour characteristics analysis of GPS buoy in rip current generation. In: Vila-Concejo, A.; Bruce, E.; Kennedy, D.M., and McCarroll, R.J. (eds.), Proceedings of the 14th International Coastal Symposium (Sydney, Australia). Journal of Coastal Research, Special Issue, No. 75, pp. 1242 - 1246. Coconut Creek (Florida), ISSN 0749-0208.

GPS buoys have been used to acquire sea level change data, current measurements and other oceanic variables in sea for the purposes of vertical datum determination, tide correction, radar altimeter calibration, ocean environment and marine pollution monitoring. The occurrence of rip currents in the Haeundae beach, which is one of the most famous beaches in South Korea, has been threatening beach-goer security in summer season annually. Therefore, we adopted a GPS buoy system for an experiment which is to investigate rip current velocity; it is sporadic and may quickly upsurge within minutes due to larger arriving wave groups or nearshore flow uncertainties. In this study, for high accurate positioning of buoy equipment, a Satellite Based Argumentation System DGPS data logger was deployed to investigate within floating object, and it can be acquired three-dimensional coordinate or geodetic position of buoy with continuous NMEA-0183 protocol during 24 hours. The wave height and current profile measured by in-situ Acoustic Doppler Current Profilers in a cross-shore array were compared with the GPS-derived current velocity, it is being clearly increased before and after generation of rip current, and wave period also was lengthened when a rip current generated. The results presented in this study indicate that by using the GPS buoy system is a reasonable alternative for the measuring of rip current behaviour.

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