2003 Fiscal Year Final Research Report Summary
Development of a beach deformation model based on transport mechanisms of mixed grain size sands due to waves and currents
| Project/Area Number |
13450201
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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 |
水工水理学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SATO Shinji The University of Tokyo, Civil, Professor, 大学院・工学系研究科, 教授 (90170753)
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| Co-Investigator(Kenkyū-buntansha) |
KOIBUCHI Yukio The University of Tokyo, Graduate School of Frontier Science, Assistant Professor, 大学院・新領域創成科学研究科, 講師 (60349800)
ISOBE Masahiko The University of Tokyo, Graduate School of Frontier Science, Professor, 大学院・新領域創成科学研究科, 教授 (20114374)
WATANABE Akira The University of Tokyo, Civil, Professor, 大学院・工学系研究科, 教授 (80011138)
HONDA Takahide The University of Tokyo, Civil, Research Associate, 大学院・工学系研究科, 助手 (70361524)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Sediments / Beach deformation / Waves and Currents / Beach process / Sheet-flow sediment transport rate |
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| Research Abstract |
Most of existing beach deformation models have been developed on the assumption of uniform sediments and therefore failed to simulate the transport as well as the deformation of mixed grain size sands. The objective of this study was to establish a beach deformation model of the mixed grain size sand applicable to the actual field.
In the surf zone, atilted waves and the undertow are developed significantly. By performing a series of laboratory experiments in an oscillatory flow tank, we observed transport mechanisms of the mixed grain size sands and obtained numerous data of the sediment transport rate for the condition of the atilted waves including currents. The results showed the coarsening and the -mixing on the surface layer. From these, we successfully developed a sand transport model considering the interference mechanisms of the different grain size sand and the applicability to the prototype scales.
Moreover, we proposed a numerical model of beach deformation of the mixed grain size sand combining the sand transport model with waves and currents models. The validity of the model was verified with laboratory experiments in a wave basin for the conditions of a detached breakwater and groins.
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Research Products
(28 results)
