| Project/Area Number |
61840012
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
気象・海洋・陸水学
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| Research Institution | Ocean Resarch Institute, University of Tokyo |
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Principal Investigator |
TAIRA Keisuke Ocean Research Institute, University of Tokyo. Professor, 海洋研究所, 教授 (50013579)
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| Co-Investigator(Kenkyū-buntansha) |
宮崎 秀久 日油技研工業(株), 開発部, 部長
FUKASAWA Masao Ocean Research Institute, University of Tokyo. Research Assoc., 海洋研究所, 助手 (10143546)
MIYAZAKI Hidehisa Nichiyu-Giken, Co. Director of Develpment Section
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥11,500,000 (Direct Cost: ¥11,500,000)
Fiscal Year 1987: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1986: ¥10,600,000 (Direct Cost: ¥10,600,000)
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| Keywords | Pressure housing for ocean with depth greater than 12 km / Titanium housing / Self-recording current meter / acoustic release / Izu-Ogasawara Trench / Water velocity fluctuatin in a ternch / tidal currents / 慣性振動 / 超深海用耐圧容器 / 日本海溝の底層流 / 流向流速計 / 係留観測 |
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| Research Abstract |
Deepest poritions over the earth are located in the western Notrh Pacific. Usually capcbilty depth of oceanic instruments in limited to be less than 600 m, however, the depth is obviously not enough for Japanese scientist. In this research project, we dovolopod we have developed instrumental nousings for depth greater then 12 km water by using titanium cylinder We developed acoustic release and current meter with titanium housing Acoustic characteristics of the release is improved by a narrow beam transducer pattern of directional, and has been proced the capability of more than 12 km signal transmission, A current meter with titanium housing has been proved to applicapable for a depth greater than 12 km. Deployments of the mooring was made on Jamary 28, and recoveres on mayll,1987. A 104 day long continuous record of current shows that inertial oscilation is increased at bottom layer. A mazimum current speed is greater than 10 cn/sec, which is first shown by the research for the depth of 9205 m in the Izu-Ogasawara Trench.
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