Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Geoacoustic Model of Erosional Shelf Ridges in the Mid-eastern Yellow Sea

  • Woo Hun Ryang (Division of Science Education and Institute of Fusion Science, Jeonbuk National University) ;
  • Seong-Pil Kim (Marine Geology & Energy Research Division, Korea Institute of Geoscience and Mineral Resources)
  • Received : 2024.07.16
  • Accepted : 2024.08.18
  • Published : 2024.08.31
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Abstract

In the mid-eastern part of the Yellow Sea, large-scale shelf ridges originated from erosion on sand-mud successions that have been presently eroded by strong tidal currents. A three-layered in situ geoacoustic model is provided down to 50 m for the subbottom sedimentary succession of a 45 m water depth using the Hamilton method. The succession is divisible into two-type units of Type-A and Type-B using high-resolution seismic profiles with a deep-drilled YSDP-104 core of 44.0 m in depth below the seafloor. Type-A unit mainly comprises sandy or gravelly sediments, whereas Type-B unit mostly consists of tidal muddy sediments with some thinner sand beds. P-wave speed values are positively compatible with the mean grain size and sediment type of the core sediments. For actual modeling, the geoacoustic property values of the models were compensated to in situ depth values below the seafloor. The detailed geoacoustic model contributes to simulating sound transmission through the sedimentary successions in erosional shelf ridges of variable geoacoustic properties distributed in shallow-water environments of the mid-eastern Yellow Sea.

Keywords

Acknowledgement

The original data of marine geophysics and geology were acquired from the Yellow Sea Drilling Program for Studies on Quaternary Geology (KR-96(T)-18). We are grateful to anonymous reviewers for their critical and helpful comments. WHR thanks Ms. Kang, Sol-Ip (Jeonbuk National University) for working on the computer graphics. This research was supported by research funds from Jeonbuk National University (2024. 3.-2026. 2.) and the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2022R1F1A1063126). SPK was supported by the project of development of the integrated geophysical survey and real-scale data processing technologies for 3D high-resolution imaging of the marine subsurface (GP2020-023) of KIGAM.

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