Measurements of Mid-frequency Bottom Loss in Shallow Water of the Yellow Sea

Title & Authors
Measurements of Mid-frequency Bottom Loss in Shallow Water of the Yellow Sea
Yoon, Young Geul; Lee, Changil; Choi, Jee Woong; Cho, Sungho; Oh, Suntaek; Jung, Seom-Kyu;

Abstract
KIOST-HYU joint acoustics experiment was performed on the western shallow water off the Taean peninsula in the Yellow Sea in May 2013. In this paper, mid-frequency (6~16 kHz) bottom loss data measured in a grazing angle range of $\small{17{\sim}60^{\circ}}$ are presented and compared to the predictions obtained using a Rayleigh reflection model. The sediment structure of the experimental site was characterized by multi-layered sediment and the components of the surficial sediment consisted of various types of particles with a mean grain size of $\small{5.9{\phi}}$. The model predictions obtained using the mean grain size were not in agreement with the measured bottom loss, and those obtained using the grain size of $\small{4{\phi}}$, which was estimated by an inversion process, showed a best fit to the measurements. It would be because the standard deviation of the gain-size distribution of surficial sediment is $\small{4.3{\phi}}$, which is much larger than those of other areas around the experimental site. Finally, the model predictions obtained using the geoacoustic parameters estimated from the inversion process for the surficial sediment layer and those corresponding to the mean grain size of $\small{1.3{\phi}}$ for lower layer are reasonably agreement with the measured bottom loss data.
Keywords
Bottom loss;Rayleigh reflection coefficient;Geoacoustic parameters;Geoacoustic inversion;
Language
Korean
Cited by
1.
천해 지질환경에서의 음파전달 특성 연구를 위한 KIOST-한양대 공동실험 개요,조성호;강돈혁;이철구;정섬규;최지웅;오선택;

한국음향학회지, 2015. vol.34. 6, pp.411-422
1.
Overview of the KIOST-HYU Joint Experiment for Acoustic Propagation in Shallow Water Geological Environment, The Journal of the Acoustical Society of Korea, 2015, 34, 6, 411
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