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http://dx.doi.org/10.7837/kosomes.2019.25.5.589

Acoustic Doppler Current Profiler Bottom Tracking Survey of Flow Structures around Geumo Archipelago in the Southern Waters of Korea  

Choo, Hyo-Sang (Faculty of Marine Technology, Chonnam National University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.25, no.5, 2019 , pp. 589-600 More about this Journal
Abstract
In order to investigate the flow structures around Geumo archipelago on Southern Waters of Korea, water movements were measured for 25 hours during spring tide in May and neap tide in September 2002 using ADCP (Acoustic Doppler Current Profiler) attached to a running boat. Dominant directions of ebb and flood current at spring tide are SE-NW, representing the average flow rate of approximately 40cm/s in the surface layer. However because of the topographical reason, the direction and speed of the flow in the narrow waterway sea area around the northwest of Gae Island were different. There was no notable baroclinic component of tidal flow at spring tide. This indicates that the sea area has been actively engaged in vertical mixing due to island wake or eddy due to narrow waterways, shallow water depth and rapid flow rate around archipelago. At neap tide, dominant directions of tidal flows are SSE-NNW and the average flow rate in the surface layer is about 85 percent of the spring tide. The duration and intensity of the flow direction are shorter and less dominant than the spring tide. It is expected that asymmetrical tidal mixing will occur due to vertical velocity shear and horizontal eddies. From daily mean tidal flows obtained from the ADCP observation, it was found that the northwest of Gae Island have flows in NW~NE, the west of Geumo Island have the average currents of up to 21 cm/s WSW~SSW and counterclockwise circulation or eddy currents are formed in the west of Sori Island.
Keywords
Archipelago; Geumo Islands; Tidal currents; ADCP Survey; Daily mean tidal flow; Island Wake;
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Times Cited By KSCI : 3  (Citation Analysis)
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