Bathymetry and Water Temperature Profile Measured by a Remote-control Boat in Very Shallow Water

Kamimura, Seiji; Ogasawara, Hiroshi; Mori, Koichi; Nakamura, Toshiaki; Kan, Haidong

doi:10.3135/jmasj.39.3

Cited by 2 publications

(1 citation statement)

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“…The geometry was measured using the multibeam sonar R2Sonic2022 in November 2011. 26) From Fig. 2, it is confirmed that there are two small depressions: in the middle and at the shallow bottom near the banks.…”

Section: Locationmentioning

confidence: 71%

Acoustical environment measurement at a very shallow port: Trial case in Hashirimizu Port

Ogasawara¹,

Mori²

2016

Jpn. J. Appl. Phys.

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Recently, the needs for coastal environment measurement has been increasing for many purposes, such as fishing, weather forecasting, ocean noise measurement for power plants, and coastal security. Acoustical measurement is one of the solutions because it can cover a wide area with few sensors, and it is possible to monitor long term or in real time. In this study, a small-scale reciprocal sound travel experiment was carried out in Hashirimizu Port for coastal environment measurement, such as current speed and water temperature. Since the distance between the surface and the transducer becomes short according to the tidal effect, the direct signal is canceled by the surface-reflected signal under a specific condition. However, even under such a condition, mean water temperature could be estimated from the reciprocal travel time using bottom-reflected signals. The current along the travel path was a reasonable value. It is possible to obtain a special current speed with another reciprocal path, which is in a direction perpendicular to the current travel path.

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Section: Locationmentioning

confidence: 71%