2003 Fiscal Year Final Research Report Summary
Wave-induced Liquefaction and Sediment Transport in Coastal Environment
| Project/Area Number |
13450192
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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 |
Geotechnical engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
SEKIGUCHI Hideo Kyoto University, Disaster Prevention Research Institute, Professor, 防災研究所, 教授 (20027296)
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| Co-Investigator(Kenkyū-buntansha) |
YAMASHITA Takao Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (30111983)
MASE Hajime Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (30127138)
KUMAGAI Takahiro Penta Ocean Construction Co.Ltd., Research Engineer, 技術研究所, 係長
KOBAYASHI Shun-ichi Kyoto University, Graduate School of Engineering, Assistant Professor, 工学研究科, 助手 (10243065)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Liquefaction / Seabed instability / Progressive solidification / Sediment gravity flow / Nearshore morphodynamics / Coastal sediment environment |
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| Research Abstract |
This research project aims at developing an integrated framework by which to describe consistently the processes of wave-induced liquefaction, fluidization and sediment transport that have profound practical implications in coastal environment. The principal results obtained may be summarized as follows :
1)Effect of wave-loading history upon liquefaction resistance of sandy sediments ; A series of centrifugal wave tests with carefully designed wave-loading histories showed that re-liquefaction resistance increased significantly due to marked densification that had occurred through "solidification" in the preceding wave-loading stage.
2)Development of a computational model for sediment gravity flow ; A three-dimensional analysis procedure for sediment gravity flow (3D-LIQSEDFLOW) has been developed in the research project. The liquefied soil is modeled as a heavy viscous fluid and a soil domain undergoing solidification is described in terms of elastoplastic consolidation theory. The free and solidification surfaces during flowage are traced using a VOF technique, facilitating analyses of a range of moving-boundary problems such as underwater sediment-dam breaking problems.
3)Mechanisms of sediment gravity flow and ensuing re-deposition ; The way in which liquefied sediment flows out and comes to a rest, was investigated in laboratory flume tests with a PIV technique introduced. The results clearly demonstrate how the initially fluid-like body of sediment with a high concentration underwent solidification in the course of flowage, eventually coming to an abrupt stop or "freezing".
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Research Products
(14 results)
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[Journal Article] Complex fluid-sediment interactions in fluvial and coastal environments.2004
Author(s)
Sekiguchi, H., Nakagawa, H., Sawada, T., Ishigaki, T., Hayashi, T., Yamashita, T., Ueno, T., Muto, Y., Baba, Y., Kato, S., Serizawa, S.
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Journal Title
Annuals, Disas.Prev.Res. Inst., KyotoUniversity No.47C
Pages: 55-70
Description
「研究成果報告書概要(欧文)」より
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