Interference of Underwater Noise Emitted by Drifting Vessel.
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- Fujieda Shigeru
- Faculty of Fisheries, Kagoshima University
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- Matsuno Yasuhisa
- Faculty of Fisheries, Kagoshima University
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- Yamanaka Yuichi
- Faculty of Fisheries, Kagoshima University
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- Inamoto Tadahiro
- Training Ship “NANAEI-MARU”, Faculty of Fisheries, Kagoshima University
Bibliographic Information
- Other Title
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- 停泊中の船舶から海中へ放射される雑音の干渉効果
- テイハクチュウ ノ センパク カラ カイチュウ エ ホウシャサレル ザツオン
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Abstract
Transmission ray of underwater noise emitted by drifting vessel have two direction i.e. direct and reflected rays. Interference occurs to receive the mixed sound wave from both rays at a hydrophone. The present research compares a theoretical interference with the basis of actual measurements of interference.<br>We observed vertically underwater noise emitted by drifting vessel with intervals one meter on 26m depth and 93m depth sea area. Also spectrogram by spectrum data was made in each depth. The results, at both stations the same striped patterns appeared on a range of about 13m and 16m from sea bottom, and on the frequency range of over 50Hz. By theoretical pattern, this spectrum level changed with their phase differences, and the interference relate to the depth of a hydrophone from the sea bottom rather than the depth of sea area. If the frequency increased, the term pattern decreases. That observed patterns coincided with a theoretical interference patterns by both waves at the frequency range of over 100Hz. A great term pattern appeared at the shallow sea area rather than the deep sea.
Journal
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- NIPPON SUISAN GAKKAISHI
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NIPPON SUISAN GAKKAISHI 63 (2), 213-221, 1997
The Japanese Society of Fisheries Science
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Details 詳細情報について
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- CRID
- 1390001206412964992
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- NII Article ID
- 10004850794
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- NII Book ID
- AN00193422
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- ISSN
- 1349998X
- 00215392
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- NDL BIB ID
- 4173463
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed