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.

Introduction
Regional Marine Geology
Materials and Methods
Results
    Seismic and sediment data
    Physical and geoacoustic property
    Geoacoustic Model
Discussion
Conclusions
Acknowledgments
References

• Woo Hun Ryang(Division of Science Education and Institute of Fusion Science, Jeonbuk National University, Jeonju 54896, Korea)
• Seong-Pil Kim(Marine Geology & Energy Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea) Corresponding author