Coastal circulation driven by bottom currents associated with tides around the continental shelf break
| Project/Area Number |
15H03723
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Tanaka Kiyoshi 東京大学, 大気海洋研究所, 准教授 (20345060)
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| Co-Investigator(Kenkyū-buntansha) |
柳本 大吾 東京大学, 大気海洋研究所, 助教 (40260517)
西垣 肇 大分大学, 理工学部, 准教授 (70253763)
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2018: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2017: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2016: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 海洋物理学 / 沿岸海洋力学 / 沿岸海洋学 / 沿岸海洋 / 大陸棚縁辺 |
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| Outline of Final Research Achievements |
Strong currents associated with internal tides near the bottom around a continental shelf break were investigated by conducting oceanographic surveys and performing numerical experiments. Shipboard and mooring monitoring surveys were conducted in the coastal ocean off the Sanriku region. A non-hydrostatic model and an ocean general circulation model were developed in the numerical experiments to investigate physical oceanographic processes over the coastal ocean including the continental shelf, continental slope, and deep basin. It was elucidated that internal mode motions are generated by convergence and divergence of flows imping on or separating from the continental slope, which originate from barotropic tides generated on the ocean basin. The internal mode motions play important roles in the coastal ocean circulation, because they are particularly strengthened near the bottom around the continental shelf and slope.
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| Academic Significance and Societal Importance of the Research Achievements |
本成果は沿岸起源の海洋環境問題や漁業問題における喫緊の社会的諸問題の解決に必須であるのみならず、2011年3月に発生した東日本大震災で甚大な被害を受けた三陸地域の震災復興に対しても貢献する。例えば、本研究で明らかにされた大陸棚上の流況や水温分布の実態は、効率的な漁業活動や海洋土木工事の安全確保などに役立てられる。また、陸棚斜面に沿って湧昇する内部潮汐流は多量の栄養塩を水深200 mより深い層から沿岸陸棚域へもたらすことから、本研究で明らかにされた海底付近の強い流れや内部潮汐流の生成機構は、今後の沿岸生態系の維持と保全策の策定にも貢献する。
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Report
(5 results)
Research Products
(22 results)
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[Journal Article] Baroclinic circulation and its high frequency variability in Otsuchi Bay on the Sanriku ria coast, Japan2017
Author(s)
Tanaka,K., K. Komatsu, S. Itoh, D.Yanagimoto, M.Ishizu, H.Hasumi, T.T. Sakamoto, S. Urakawa, Y. Michida
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Journal Title
Journal of Oceanography
Volume: 73
Issue: 1
Pages: 25-38
DOI
Related Report
Peer Reviewed
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[Journal Article] High-resolution hydrographic observation with local communities in the Sanriku coastal seas, Japan2016
Author(s)
Tanaka, K., K. Komatsu, S. Itoh, D. Yanagimoto, M. Ishizu, H. Hasumi, TT. Sakamoto, S. Urakawa, and Y. Michida
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Journal Title
Marine ecosystems after Great East Japan Earthquake in 2011 -Our knowledge acquired by TEAMS-
Volume: 1
Pages: 35-36
Related Report
Open Access
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[Presentation] Ecosystem modeling2016
Author(s)
Tanaka, K.
Organizer
International Symposium on Restoration after Great East Japan Earthquake
Place of Presentation
University of Tokyo, Tokyo, Japan
Year and Date
2016-03-03
Related Report
Int'l Joint Research
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