| Presentation | 2015-08-24 Study of sound propagation by the air gun source of Multi-Channel Seismic System in the ocean Toshio Tsuchiya, Shinpei Gotoh, Etsuro Shimizu, Kouji Futa, Fujio Yamamoto, Yoshihiro Fujiwara, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Multi Channel Seismic System (MCS) is used for purpose of an investigation in a focal region and submarine resource-searching all over the world in recent years. Special vessel for MSC is often also built all over the world. But an environmental protection group shows the suspicion by which an high-power air gun source of MCS has an influence upon ecology of a marine mammal. Therefore the user of MCS is requesting always to watch a marine mammal. So JAMSTEC made a guideline to protect a marine mammal independently. When finding a marine mammal in a watch area, this guideline has decided that an air gun is stopped. But this guideline followed the example of foreign countries. So an air gun of the resource-searching ship “KAIMEI” built by JAMSTEC was used for this research. Sound Ray theory , Normal Mode theory and Parabolic Equation were used for this simulation. The sound pressure level and the wave receiving pulse was calculated by short distance (watch area) and a long distance (300km). The 3 typical sound speed profiles different in latitude in seas close to Japan for calculation were used. A simulation result showed that an air gun source has only a small influence on teeth whale in the watch area. Long-distance transmission calculation showed that a transmission process is spherical spread attenuation. A simulation result showed that the watch reach of the guideline is almost proper. A result of the long-distance propagation analysis showed that there is little influence in low and medium latitude sea. However, this result showed that a wave receiving signal becomes strong at high latitude sea. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | multi channel seismic system / air gun / MCS / marine mammal / sound propagation / ray theory / mode theory / toothed whale |
| Paper # | US2015-45 |
| Date of Issue | 2015-08-17 (US) |
| Conference Information | |
| Committee | US |
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| Conference Date | 2015/8/24(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tokyo Institute of Technology, Ookayama Campus |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Underwater Acoustics, General(Co-Organization：The Marine Acoustics Society of Japan) |
| Chair | Yoichi Itoh(Nihon Univ.) |
| Vice Chair | Mami Matsukawa(Doshisha Univ.) / Nobuyuki Endoh(Kanagawa Univ.) |
| Secretary | Mami Matsukawa(Univ. of Electro-Comm.) / Nobuyuki Endoh(Univ. of Electro-Comm.) |
| Assistant | Shin-ichi Hatanaka(Univ. of Toyama) |
| Paper Information | |
| Registration To | Technical Committee on Ultrasonics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Study of sound propagation by the air gun source of Multi-Channel Seismic System in the ocean |
| Sub Title (in English) | Does an air gun source have an influence on a swimming marine mammal? |
| Keyword(1) | multi channel seismic system |
| Keyword(2) | air gun |
| Keyword(3) | MCS |
| Keyword(4) | marine mammal |
| Keyword(5) | sound propagation |
| Keyword(6) | ray theory |
| Keyword(7) | mode theory |
| Keyword(8) | toothed whale |
| 1st Author's Name | Toshio Tsuchiya |
| 1st Author's Affiliation | Japan Agency for Marine-Earth Science and Technology/Tokyo University of Marine Science and Technology(JAMSTEC/TUMSAT) |
| 2nd Author's Name | Shinpei Gotoh |
| 2nd Author's Affiliation | Japan Agency for Marine-Earth Science and Technology(JAMSTEC) |
| 3rd Author's Name | Etsuro Shimizu |
| 3rd Author's Affiliation | Tokyo University of Marine Science and Technology(TUMSAT) |
| 4th Author's Name | Kouji Futa |
| 4th Author's Affiliation | Mitsubishi Precision Co.,LTD(Mitsubishi Precision) |
| 5th Author's Name | Fujio Yamamoto |
| 5th Author's Affiliation | Japan Agency for Marine-Earth Science and Technology(JAMSTEC) |
| 6th Author's Name | Yoshihiro Fujiwara |
| 6th Author's Affiliation | Japan Agency for Marine-Earth Science and Technology(JAMSTEC) |
| Date | 2015-08-24 |
| Paper # | US2015-45 |
| Volume (vol) | vol.115 |
| Number (no) | US-186 |
| Page | pp.pp.43-48(US), |
| #Pages | 6 |
| Date of Issue | 2015-08-17 (US) |