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Studies on the Underwater Sound―II On the Diurnal Variation of the TEMPURA NOISE in the Coastal Waters of Nagasaki Prefecture
http://hdl.handle.net/10069/31228
http://hdl.handle.net/10069/31228fa2c1d7b-feae-4232-95c3-d4c0b9a60e70
名前 / ファイル | ライセンス | アクション |
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suisan28_031.pdf (528.1 kB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2013-04-08 | |||||
タイトル | ||||||
タイトル | Studies on the Underwater Sound―II On the Diurnal Variation of the TEMPURA NOISE in the Coastal Waters of Nagasaki Prefecture | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
著者 |
Takemura, Akira
× Takemura, Akira |
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著者別名 | ||||||
姓名 | 竹村, 暘 | |||||
その他のタイトル | ||||||
その他のタイトル | 水中音に関する研究-2 : 長崎県沿岸におけるテンプラノイズの日周変化について | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | In the coastal waters of Nagasaki Prefecture, 24-hour observations were made for the sound level of TEMPURA NOISE (frying noise) at 6 stations with less traffic noise. It was revealed that the TEMPURA NOISE level shows diurnal variations and high peak values at sunrise and sunset being 3 - 5 dB higher than that in daytime or nighttime. There was observed no characteristic difference in noise level between the daytime and the nighttime, but it was observed that the noise level of daytime is sometimes higher than that of nighttime and vice versa. The level of the noise varied by the quality of the bottom materials, and variation was remarkable in the sea area of sandy mud bottom. The variation of noise level was considered to be caused by the sudden change in brightness of the sunbeam at sunrise or sunset, and not so much to be influenced by the factors of the tide and so on. It seems that the frequency characteristics of the noise is variable by the bottom condition and the biological noise at any station depends on the life of the sea at the station. The range of the noise level was about 65 - 85 dB (2 X 10-4μ bar).!?1) The diurnal variation of the underwater sound was investigated 10 times at 6 stations on the coastal waters of Nagasaki Prefecture from January to September in 1969. 2) The underwater noise level reached to the peak value twice a day (at sunset and sunrise) being 3-5dB higher than that in nighttime and daytime. 3) The noise level in daytime was sometimes higher than that in nighttime and sometimes equal with the latter. No obvious difference in the noise level was observed between the nighttime and the daytime. 4) The noise was influenced even by the condition of the bottom materials, for example, the noise at the bottom of sandy mud was the hugest. 5) This variation was caused chiefly by sudden change of brightness and it did not seem that the variation was influenced by the tide, water temperature, air temperature, atmospheric pressure, and so on. 6) The frequency distribution of the underwater noise was somewhat different by the condition of the bottom materials and the underwater life in the area, and the considerably powerful noise level was observed between 1 and 4 kHz at sunrise and sunset in the area where many snapping shrimps might possibly live as mentioned in the previous paper. 7) The sound pressure level was about 65-85 dB. 8) It was not likely that the sessile animals which adhere to the tidal zone are the main cause of the TEMPURA NOISE. | |||||
書誌情報 |
長崎大学水産学部研究報告 en : Bulletin of the Faculty of Fisheries, Nagasaki University 巻 28, p. 31-41, 発行日 1969-12 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 05471427 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AN00178473 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
論文ID(NAID) | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | NAID | |||||
関連識別子 | 40018181079 | |||||
出版者 | ||||||
出版者 | 長崎大学水産学部 | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 長崎大学水産学部研究報告, v.28, pp.31-41; 1969 |