2015 Fiscal Year Final Research Report
Three-dimensional formation dynamics of fluvial bars inferred from in GPR analyses of a flume experiment and Holocene deposits
| Project/Area Number |
23540538
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Natural History Museum and Institute, Chiba |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
TAMURA TORU 産業技術総合研究所地質調査総合センター, 地質情報研究部門, 主任研究員 (10392630)
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| Research Collaborator |
KWAK YOUNGJOO 土木研究所, 水災害リスクマネジメント国際センター, 研究員 (60586642)
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| Project Period (FY) |
2011-04-28 – 2016-03-31
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| Keywords | GPR / 河川州 |
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| Outline of Final Research Achievements |
We conducted a ground-penetrating radar (GPR) survey using 250-MHz antenna of gravelly braid bars in the Abe River and a sandy point bar in the Yahagi River, central Japan, to clarify the three-dimensional (3D) fluvial facies. We identified four fundamental radar depositional facies: Inclined reflections, horizontal to subhorizontal reflections, discontinuous trough-shaped reflections, and facies assemblage with a large-scale channel-shaped lower boundary, which are interpreted as bedloard sheet, unit bar, 3D dune, and cross-channel fill. Facies models are constructed from the GPR results of two bars (high sediment discharge & active bar, low sediment discharge & inactive bar). GPR analysis of flume deposits detects the channel surface, however, the bar facies model has not represented in a flume yet.
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| Free Research Field |
堆積学
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