2004 Fiscal Year Final Research Report Summary
Development of numerical models for wave deformation and sediment transport in wave-current coexisting field near river mouth
| Project/Area Number |
15560442
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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 |
水工水理学
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| Research Institution | Kanazawa University |
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Principal Investigator |
YUHI Masatoshi Kanazawa University, Graduate School of Natural Science and Technology, Associate Professor, 自然科学研究科, 助教授 (20262553)
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| Co-Investigator(Kenkyū-buntansha) |
MASE Hajime Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (30127138)
YAMADA Fumihiko Kumamoto University, Graduate School of Science and Technology, Associate Professor, 大学院・自然科学研究科, 助教授 (60264280)
UMEDA Shinya Kanazawa University, Graduate School of Natural Science and Technology, Research Associate, 自然科学研究科, 助手 (30313688)
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| Project Period (FY) |
2003 – 2004
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| Keywords | river mouth / wave-current coexisting field / wave deformation / sediment transport / estuary / Boussinesq equation / wave action equation / empirical orthogonal eigenfunction analysis |
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| Research Abstract |
Physical understanding of wave characteristics and corresponding sediment transports around river mouths is essentially important in order to maintain physical environments and to prevent natural disasters in coastal areas. In this study, numerical and statistical models are developed for the wave transformation, viscous water flows, cohesive mudflows, and morphological seabed changes in the wave-current coexisting fields near river mouths. The main results obtained in this study are summarized as follows.
A wave prediction model based on the wave action balance equation has been developed for analysis of wave deformation in large areas. This model includes the effects of wave breaking and diffraction in the wave-current coexisting fields. For detailed analysis of wave transformation in smaller areas, improved Boussinesq equations are derived and the corresponding numerical model has been constructed. In addition, the two-and three-dimensional viscous flow fields around coastal structures are numerically investigated on the basis of the Navier-Stokes equations in a generalized curvilinear coordinates. The characteristics of mudflows consisting of water and small mud particles are also examined.
Furthermore, long-term variations of the seabed profile near Tedori river mouth, Japan, are investigated using a set of field surveys. The effects of the sediment management along the river such as dam construction and sand dredging on the seabed morphology near the river mouth is examined. The mudflat profiles near the Shirakawa river mouth, Japan, have also been analyzed by using a quadratic profile approach.
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