| Project/Area Number |
19540486
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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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 |
KUMASHIRO Hiroko Natural History Museum and Institute, Chiba, 自然誌歴史研究部地学研究科, 主席研究員 (10250135)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAZATO Hiroomi (独)農業・食品産業技術総合研究機構, 農村工学研究所, 主任研究員 (00373225)
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| Research Collaborator |
IKEDA Hiroshi 元筑波大学陸域環境センター
KAKU Yonju (独)土木研究所/水災害リスクマネジメント国際センター(ICHARM)
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| Project Period (FY) |
2007 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Keywords | GPR / 非破壊解析 / 3次元モニタリング / 水路実験 / 河川堆積物 / 平面水路 / 蛇行河川 / 地中レーダー / 洪水堆積物 / 電磁波反射法 / フォーセット構造 / 化石密集層 |
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| Research Abstract |
Ground penetrating radar (GPR) offers a fast and efficient method for visualizing three-dimensional (3D) images of shallow subsurface structures. The research reported here the application of GPR for nondestructive imaging of deposits formed in a small experimental flume. This research used two separate runs for (1) selecting a frequency of the GPR antenna with appropriate resolution for analyzing experimental structures, (2) reconstructing 3D buried architecture in a flume and (3) revealing characteristics of reflection boundaries. Experimental materials were loamy soil, magnetite sand and quartz sand. The first run showed that a 1.5 GHz antenna was suited for laboratory use, offering depth resolution estimated at 3-5 cm and full penetration of a water-saturated sediment bed 10-25 cm thick. The GPR scanning yielded a reconstruction of the 3D architecture of a model river channel using magnetite marker beds, with the depth and width of channel accurately detected and delineated from the GPR profiles. The second run successfully imaged a boundary surface between loamy soil and quartz sand defined by the difference in their dielectric permittivities.
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