Surface current variability in the Keum River Estuary (South Korea) during summer 2002 as observed by high-frequency radar and coastal monitoring buoy |
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| Authors: | Young-Tae Son Sang-Ho Lee Chang-Soo Kim Jae Chul Lee Gwang-Hee Lee |
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| Institution: | 1. Department of Ocean Information Science, SERC, Kunsan National University, Kunsan 573-701, South Korea;2. Korea Inter-University of Ocean Science, Pukyong National University, Pusan 608-737, South Korea |
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| Abstract: | High-frequency (HF) radar observations of surface currents were conducted for 3 months during summer 2002 in the Keum River estuary. A comparison between HF radar-derived currents and directly measured ones form a buoy showed that the regression slope is close to 1 and the correlation coefficient greater than 0.86, with an RMS difference less than 13 cm/s which is less than 17% of the tidal current. This fairly good agreement allows us to use HF radar observation in investigating the surface flow and circulation in this tidal-current-dominant coastal-plume area. To examine the spatial variation in tidal current characteristics, as well as currents associated with non-tidal forcing, the HF radar-derived currents were separated into tidal and sub-tidal frequency currents. The overall pattern of M2-current ellipse distribution in the study area showed a counterclockwise rotation, with the offshore maximum current direction to the northeast. Eccentricity, the direction of maximum current, and the phase of net motion of the ellipse changed near the estuary mouth and near the gap of the Saemangeum reclamation tide dyke due to the complex coastal geometry and the out-flowing jet during the ebb period. |
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| Keywords: | HF radar Tidal current Sub-tidal current Ebb-jet Wind effects River plume Effect of reclamation tide dyke |
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