Acoustic measurement of the net transport through the Seto Inland Sea

Zhang, Chuanzheng; Kaneko, Arata; Zhu, Xiao‐Hua; Howe, Bruce M.; Gohda, Noriaki

doi:10.1250/ast.37.10

Cited by 16 publications

(49 citation statements)

References 24 publications

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“…In the observation site, strong tidal currents cause vertical mixing and weaken thermal stratification (e.g., Takeoka, ; Yanagi & Okada, ). During the experimental periods, the sound speed increased with depth except occasionally for the upper few meters (Zhang et al, ). When the sound speed increases with depth, the first arrival ray is the refracted‐surface‐reflected ray with the turning depth near the seafloor.…”

Section: Methodsmentioning

confidence: 98%

“…In 2012, a CAT experiment was conducted in the eastern portion of the Aki‐Nada sea area ( nada in the SIS indicates relatively wide basins connected by relatively narrow straits) with the aim of estimating the volume transport through the SIS (Figure c). Zhang et al () analyzed the reciprocal travel time data over 6 months and concluded that the net westward transport averaged monthly for the successfully observed period was

13, 100 \pm 2, 500

m 3 s −1 . In the experiment, the reciprocal acoustic transmissions were conducted along one transmission line (Figure c).…”

Section: Introductionmentioning

confidence: 99%

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Variation of Residual Current in the Seto Inland Sea Driven by Sea Level Difference Between the Bungo and Kii Channels

et al. 2018

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Understanding residual (i.e., total minus tidal) currents in coastal seas is important because the residual currents affect long‐term material transports. In the Seto Inland Sea, Japan (SIS), a Bungo Channel to Kii Channel sea level difference causes a horizontal pressure gradient in the SIS and thus affects the residual current in the SIS. This study applies a linear regression method to examine how the residual current responds to the Bungo‐Kii sea level difference. The residual current is obtained using the reciprocal acoustic transmission data collected in the eastern portion of the Aki‐Nada sea area in 2012. The residual currents are estimated in the following three periods: from 12 April to 9 June, from 15 June to 21 July, and from 20 September to 27 October. In the regression analysis, an additional term is included to account for the fortnightly variation of the tide‐induced residual current. More than 75% of the observed residual currents can be explained by the sea level difference and the fortnightly variation. For the three periods, the variations of the residual current along the acoustic transmission line are, respectively, 0.20 ± 0.01, 0.22 ± 0.01, and 0.30 ± 0.01 cm s−1 per 1 cm of the Bungo‐Kii sea level difference. The corresponding variations in the volume transport are 920 ± 149, 1,040±170, and 1,390±223 m3 s−1 per 1 cm sea level difference. Comparing with the wind‐induced volume transport, we find that the sea level difference can cause a comparable volume transport variation.

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Section: Methodsmentioning

confidence: 98%

13, 100 \pm 2, 500

m 3 s −1 . In the experiment, the reciprocal acoustic transmissions were conducted along one transmission line (Figure c).…”

Section: Introductionmentioning

confidence: 99%

Variation of Residual Current in the Seto Inland Sea Driven by Sea Level Difference Between the Bungo and Kii Channels

et al. 2018

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“…Station B3 on the Bali side was sited at an abandoned platform of a natural gas pipeline 60 m offshore from the coast, and station B4 on the Java side was at the edge of a jetty in a resort hotel. The distance between B3 and B4 was 4,461 m, determined from the global positioning system (GPS) and conductivity-temperature-depth (CTD) correction [10]. The seafloor depth is about 27 m at B3 and 5 m at B4.…”

Section: Methodsmentioning

confidence: 99%

“…Here C 0 is the reference sound speed and L is the stationto-station distance [10]. For a modulation number of three cycles per digit, t r ¼ 3=10;000 ¼ 0:3 ms. For L ¼ 4;461 m and C 0 ¼ 1;500 ms À1 , V e ¼ 0:076 ms À1 and C e ¼ 0:152 ms À1 .…”

Section: Error Evaluationmentioning

confidence: 99%

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Profiling measurement of internal tides in Bali Strait by reciprocal sound transmission

Syamsudin

Chen

Adityawarman

et al. 2017

Acoust. Sci. & Tech.

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A reciprocal sound transmission experiment was carried out during June 10-13, 2015 along a cross-strait line in the Bali Strait with strong tidal currents to measure the vertical section structures of the range-averaged current and temperature at a 3 min interval. The five-layer structures of the range-averaged current and temperature in the vertical section were reconstructed by regularized inversion of the travel time data for two rays. The hourly-mean current showed the generation of nonlinear internal tides with amplitudes of 1.0-1.5 ms À1 and periods of 6 h superimposed on semidiurnal internal tides with amplitudes decreasing from the upper to lower layer. The hourly-mean temperature was characterized by variations with amplitudes of 1.0-1.5 C and periods of 6 and 8 h. The current variations showed an out-of-phase relation between the upper and lower layers while the temperature data varied in-phase for all five layers. The two-day-mean current and temperature showed a stratified structure, varying from À0:6 to À0:1 ms À1 and from 23.8 to 28.0 C, respectively. The five-layer current and temperature were significantly above the inversion errors.

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2020

Coastal Acoustic Tomography

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Acoustic measurement of the net transport through the Seto Inland Sea

Abstract: Abstract:The net transport through the Seto

Cited by 16 publications

References 24 publications

Variation of Residual Current in the Seto Inland Sea Driven by Sea Level Difference Between the Bungo and Kii Channels

Variation of Residual Current in the Seto Inland Sea Driven by Sea Level Difference Between the Bungo and Kii Channels

Profiling measurement of internal tides in Bali Strait by reciprocal sound transmission

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