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Geoacoustic Model of Surface Sediments in the East of Geoje Island, the South Sea of Korea  

KIM, GIL YOUNG (Research Institute of Marine Science & Technology, Korea Maritime University)
KIM, DAE CHOUL (Departmet of Environmental Exploration Engineering, Pukyong National University)
SHIN, BO KYOUNG (Departmet of Environmental Exploration Engineering, Pukyong National University)
SEO, YOYUNG KYO (Gematek Co. Ltd.,)
LEE, GWANG HOON (Departmet of Environmental Exploration Engineering, Pukyong National University)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.10, no.2, 2005 , pp. 129-138 More about this Journal
Abstract
Sediment texture, physical (porosity, water content, bulk density, grain density, and shear strength), and geoacoustic properties (compressional wave velocity and attenuation) were measured on eighteen core samples collected from the shelf off eastern Geoje Island, the South Sea of Korea. Based on these properties, the study area is divided into three different sub-areas: (1) Area I affected directly by the Nakdong River discharge; (2) Area II covered by the southern branch of the Nakdong River discharge; and (3) Area III dominated by relict sediment. Mean grain size, velocity, and bulk density decrease from Area $I(7.4\Phi,\;1528m/s,\;1.6g/cm^3,\;respectively)$ to Area $II(8.1\Phi,\;1485m/s,\;and\;1.5g/cm^3)$, and then increase rather rapidly in Area $III(1.4\Phi,\;1664m/s,\;and\;2.2g/cm^3)$. Porosity, on the other hand, exhibits an opposite trend, increasing from Area $I(64.5\%)$ to Area$II(73.9\%)$ and then decreasing significantly in Area $III(32.9\%)$ From the results measured and calculated, we suggest a specified geoacoustic model in the study area.
Keywords
Sediment Texture; Physical and Acoustic Properties; Geoacoustic Model;
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