2013 Fiscal Year Final Research Report
Elucidation of sedimentological mechanism of gravity flows by tsunamis
| Project/Area Number |
23310118
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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 |
Natural disaster science
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| Research Institution | Tohoku University |
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Principal Investigator |
MINOURA Koji 東北大学, 理学(系)研究科(研究院), 教授 (10133852)
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| Co-Investigator(Kenkyū-buntansha) |
IMAMURA Fumihiko 東北大学, 災害科学国際研究所, 教授 (40213243)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 津波 / 押し波 / 引き波 / 重力流 / 密度流 |
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| Research Abstract |
Sedimentological and micropaleontological analyses of terrestrial and nearshore to offshore sediments recovered from the coast of the Sendai Bay were performed to clarify the processes of sediment transport and deposition by the tsunami retreat. The distribution pattern of sediment grains and diatom frustules showed seaward migration after the tsunami event. It has been suggested that sediments originally distributed in terrestrial and coastal zones were transported offshore due to the tsunami backwash. The distribution pattern of planktonic and benthic species living in offshore zones showed slight evidence of landward migration by the tsunami. This suggests that landward redistribution of sediments by the tsunami run-up did not occur in the offshore seafloor of the study area. It is possible that tsunami backwashes induce sediment flows that transport a large amount of coastal materials seaward.
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Research Products
(20 results)
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[Journal Article] Emplacement and movement of boulders by known storm waves - Field evidence from the Okinawa Islands, Japan2011
Author(s)
Goto, K., Miyagi, K., Kawana, T., Takahashi, J., and Imamura, F.
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Journal Title
Marine Geology
Volume: vol. 283
Pages: 66-78
Peer Reviewed
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