Conditions for generating tsunami-induced turbidity currents and their depositional processes: Examination of a new generating mechanism of turbidity currents
| Project/Area Number |
26287127
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Kyoto University |
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Principal Investigator |
Naruse Hajime 京都大学, 理学研究科, 准教授 (40362438)
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2015: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2014: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
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| Keywords | 津波 / 混濁流 / 堆積相解析 / モーフォダイナミクス / 逆解析 / 災害 / 海洋地質 / タービダイト / 堆積学 / 地質学 / 水槽実験 / 浮流砂 / 混合粒径 / 乱流抑制効果 |
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| Outline of Final Research Achievements |
Firstly, as a result of numerical experiments, it was suggested that there are distinct threshold conditions to generate turbidity currents from tsunamis. Turbidity currents can be developed from very dilute suspended clouds due to the self-acceleration mechanism if initial height of clouds are sufficiently high. On the other hand, when the initial conditions are slightly below the threshold condition, turbidity current decays very rapidly. This suggests that only large-scale tsunamis like 2011 Tohoku-Oki Tsunami can produce turbidity currents.
Secondly, the inverse modeling of turbidites proposed in this study enables us to estimate the flow conditions from thickness and grain-size distributions of turbidites that are measured at every ca. 1 km along flow directions. This method will be useful for future investigation of past-tsunami records using tsunami-generated turbidites.
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Report
(5 results)
Research Products
(24 results)
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[Journal Article] Planform evolution of deltas with graded alluvial topsets: Insights from three‐dimensional tank experiments, geometric considerations and field applications2016
Author(s)
Muto, T., Furubayashi, R., Tomer, A., Sato, T., Kim, W., Naruse, H., & Parker, G.
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Journal Title
Sedimentology
Volume: 63
Issue: 7
Pages: 2158-2189
DOI
NAID
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Stratigraphic variations in lacustrine sediment gravity-flow deposits intercalated in varved diatomite: An example from the Hiruzenbara Formation, Okayama Prefecture, southwest Japan2015
Author(s)
Sasaki, H., Sasaki, Y., Saito-Kato, M., Naruse, H., Yumi, M., & Ishihara, Y.
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Journal Title
Quarternary International
Volume: 397
Pages: 208-222
DOI
Related Report
Peer Reviewed
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[Journal Article] Devonian–Carboniferous transition containing a Hangenberg Black Shale equivalent in the Pho Han Formation on Cat Ba Island, northeastern Vietnam.2014
Author(s)
Toshifumi Komatsu, Satoru Kato, Kento Hirata, Reishi Takashima, Yukari Ogata, Masahiro Oba, Hajime Naruse, Phuong H. T, Phong D. Nguyen, Huyen T. Dang, Truong N. Doan, Hung H. Nguyen, Susumu Sakata, Kunio Kaiho, Peter Königshof
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Journal Title
Palaeogeography, Palaeoclimatology, Palaeoecology
Volume: 404
Pages: 30-43
Related Report
Peer Reviewed
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[Journal Article] Large volume submarine ignimbrites in the Shikoku Basin: An example for explosive volcanism in the Western Pacific during the Late Miocene.2014
Author(s)
Steffen Kutterolf, Julie C. Schindlbeck, Rachel P. Scudder, Richard W. Murray, Kevin T. Pickering, Armin Freundt, Shasa Labanieh, Ken Heydolph, Sanny Saito, Hajime Naruse, Michael B. Underwood, and Huaichun Wu
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Journal Title
Geochemistry, Geophysics, Geosystems
Volume: 15.5
Pages: 1837-1851
Related Report
Peer Reviewed
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[Journal Article] Lower Triassic mixed carbonate and siliciclastic setting with Smithian–Spathian anoxic to dysoxic facies, An Chau basin, northeastern Vietnam.2014
Author(s)
Toshifumi Komatsu, Hajime Naruse, Yasunari Shigeta, Reishi Takashima, Takumi Maekawa, Huyen T. Dang, Tien C. Dinh, Phong D. Nguyen, Hung H. Nguyen, Gengo Tanaka, Masatoshi Sone
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Journal Title
Sedimentary Geology
Volume: 300
Pages: 28-48
Related Report
Peer Reviewed
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