Real-Time Offshore Coastal Acoustic Tomography Enabled with Mirror-Transpond Functionality
Journal
IEEE Journal of Oceanic Engineering
Journal Volume
45
Journal Issue
2
Pages
645-655
Date Issued
2020
Author(s)
Chen M
Syamsudin, F.
Kaneko, A.
Gohda, N.
Howe, B.M.
Mutsuda, H.
Dinan, A.H.
Zheng, H.
Huang, C.
Taniguchi, N.
Zhu, X.
Adityawarman, Y.
Zhang, C.
Abstract
Real-time offshore coastal acoustic tomography (CAT) with mirror-transpond functionality is the most recent feature added to CAT to transfer travel-time data obtained in an offshore subsurface station to a shore station in real time, forming a round-trip travel time by original transmission and subsequent mirror transmission. The minimum unit, composed of one land and one offshore system, was operated to validate the performance of CAT with mirror-transpond functionality (MCAT) in the feasibility experiment, which was carried out in April 2017 in the Nekoseto Strait of the Seto Inland Sea, Japan. The root-mean-square error (RMSE) of the hourly mean range-average currents calculated from the original-original and original-mirror reciprocal travel-time pairs was 0.05 ms-1, significantly smaller than the variation range of the semidiurnal tidal current (0.2-0.3 ms-1) dominant at the experimental site. The RMSE for the residual current was also significantly smaller than its variation range. This study suggests the feasibility of using a compact MCAT array composed of one land and three offshore stations. ? 1976-2012 IEEE.
Subjects
Acoustic wave transmission; Acoustics; Data transfer; Interactive computer systems; Mean square error; Mirrors; Ocean currents; Offshore oil well production; Tomography; Underwater acoustics; Cats; Coastal acoustic tomography; Feasibility experiments; Oceans; Sea measurements; Seto Inland Sea; Real time systems
SDGs
Type
journal article