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Recent Geomorphological Changes and late Quaternary Depositional Sequence of Gwangyang Bay, southern coast of Korea  

최동림 (한국해양연구소 남해연구소)
현상민 (한국해양연구소 남해연구소)
이태희 (한국해양연구소 남해연구소)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.8, no.1, 2003 , pp. 35-43 More about this Journal
Abstract
Recent geomorphological changes and late Quaternary depositional sequences of Gwangyang Bay are studied based on bathymetric maps, surface sediments, and seismic profiles. As a result of the reclamation of coastal area for an industrial complex construction, the coastline of Gwangyang Bay has rapidly been changed and the area of it has now been reduced by about 25 ％ in the last 30 years. In addition, the bottom topography is actively modified by dredging for navigation channels. In surfical sediment distribution, the western part of Gwangyang Bay is dominated by mud facies, whereas the eastern part of the Bay is dominated by sand-mud mixing facies. Depositional sequences above the basement are divided into two units: Unit I in upper layer and Unit II in lower one. These depositional units are unconformably bounded by middle reflector-M. Unit II, mostly occupying the channel areas, is interpreted as fluvial-origin deposits during sea-level lowstand. Unit I typically shows a progradational pattern from the Seomjin River mouth to the Yeosu Strait, which is interpreted as deltaic deposits supplied from the Seomjin River during the Holocene sea-level highstand. The shallow gas within the sediments Is widely distributed in most area, and locally exposed onto the sea-bed due to dredging.
Keywords
Geomorphological changes; Depositional sequence; Shallow gas; Seomjin river; Gwangyang bay;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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