속초항과 청초호의 부진동 특성(1. 현장관측과 자료 분석)

Abstract

To investigate long-period wave responses in Sokcho Harbor and Cheongcho lagoon, fieldmeasurements were made for long- and short-period waves and current velocities using a DirectionalWaverider, a ultrasonic-type wave gauge, four pressure-type wave gauges, and a current meter. From the dataanalysis, it was found that the Helmholtz resonant periods of Sokcho Harbor and Cheongcho lagoon are about13.6 and 54.5 minutes, respectively, and the dominant period of wave induced current in the passage betweenSokcho Harbor and Cheongcho lagoon is about 55.2 minutes which depends on Helmholtz resonant conditionof the Cheongcho lagoon. It was also found that the energy level of the far-infra-gravity waves during stormconditions is very high compared with that during calm sea conditions. To investigate relationships betweenfar-infra-gravity waves and short-period waves at offshore station, regression analyses were carried outespecially for .) heights, 2) periods, 3) direction and height, 4) height and period between short-and far-infra-gravity waves, respectively. The results showed that the long-period wave height is highly correlated with theshort-period wave height. However, no special trend was found for the other relations. In the future far-infra-gravity wave heights on return period around Sokcho Harbor region can be suggested by using extreme valueanalyses of long term measured data.