Correcting the Sound Velocity of the Sediments in the Southwestern Part of the East Sea, Korea

Kim, Daechoul; Lee, Gwang-Soo

doi:10.5467/jkess.2016.37.7.408

Cited by 2 publications

(1 citation statement)

References 17 publications

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“…The laboratory p-wave speed was corrected using the empirical model proposed by Kim [27] and the geoacoustic model of Hamilton [28] using the velocity ratio, water temperature in the sediment, depth, and salinity. The corrected in-situ p-wave speed was predicted to range from 1411 to 1458 m/s for Kim's empirical model and 1440-1460 m/s for Hamilton's geoacoustic model [29]. Because these values in the sediment are lower than the water sound speed on the sea floor, the sediment at the experimental site is acoustically slow and can be considered as a soft bottom (or soft sediment).…”

Section: Bathymetry and Geoacoustic Modelingmentioning

confidence: 98%

Observation of the Relationship between Ocean Bathymetry and Acoustic Bearing-Time Record Patterns Acquired during a Reverberation Experiment in the Southwestern Continental Margin of the Ulleung Basin, Korea

Jung

Lee

2021

JMSE

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We observed a distinct drop-off region in the bearing-time record of acoustic reverberation data acquired from the south-western continental margin of the Ulleung Basin, East Sea, in the summer of 2015. 3 kHz continuous waves with pulse lengths of 0.1, 0.3, and 1.0 s were used as source pulses, with an R/V Cheonghae vessel towing a variable depth source and a triplet towed array toward the deep sea from shallow water. The observed pattern changed as the R/V Cheonghae moved across the continental slope further into the sea. This pattern arises as a result of the downward-refracted beams in the 1/2 convergence zone interacting with the soft bottom. In addition, the boundary of the drop-off region was modeled with the two-way maximum travel time of the first bottom-reflected rays using the bathymetry model of the General Bathymetric Chart of the Oceans, 2020. Some discrepancies were observed when comparing the modeled curve to the measured results, and the inaccuracy of the bathymetry model on the continental slope could be the main cause of these discrepancies. This pattern could be useful for bathymetry mapping, as well as estimations of source and receiver configurations.

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Section: Bathymetry and Geoacoustic Modelingmentioning

confidence: 98%