| Project/Area Number |
07555164
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
水工水理学
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| Research Institution | Meijo University |
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Principal Investigator |
TSUCHIYA Yoshito Meijo University, Faculty of Urban Science, Professor, 都市情報学部, 教授 (90025883)
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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)
ITO Masahiro Meijo University, Faculty of Science & Engineering, Professor, 理工学部, 教授 (90076638)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥10,300,000 (Direct Cost: ¥10,300,000)
Fiscal Year 1997: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1996: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 1995: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | Beach erosion / Erosive wave / River delta / Beach erosion control / Methodology for beach erosion control using headlands / Large scale coastal behavior / Predictive model for long-term shoreline change / 海岸浸食 / 海岸浸食制御法 / 河口デルタの縮小 / 汀線変化予測モデル / 海岸浸食の波動性 / 標砂源管理 / 海岸侵食制御法 / 沿岸漂砂量 |
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| Research Abstract |
In this research project, a methodology for beach erosion control for the reduction of a river delta was investigated based on the stabilization of sanday coasts in the sedimentation system, as well as their large scale coastal behavior. The main results are summarized as
1)Reduction processes of a river delta and its prediction Investigated the reduction process of the river deltaic coasts of the Kurobe, Abe, Fuji, Tenryu rivers, there clearly exist two modes of shoreline changes due to distinct types of erosive wave. The first mode is defined to be an erosive wave propagating down-coast as a diffusion phenomenon, and the second was estimated from the variation from the erosive wave and defined to be an erosive wave propagating down-coast as a wave phenomenon. We conclude that shoreline change due to beach erosion can be described as space-time change propagating down-coast as a diffusion phenomenon, upon which shoreline variation propagates as a wave phenomenon faster than the shoreli
… More
ne change. The erosive wave of the first mode are subject to changes as positive and negative erosive wave due to the initial and boundary conditions at the river mouth in relation to the sediment input from the river and local change in the river delta. A long-term shoreline change prediction model was established introducing the representative stormy wave and swell. Its application was made to hindcast the long-term shoreline change on the Joetsu-Ogata coast.
2)Methodology for beach erosion control Based on the methodology for beach erosion control using headlands and large scale coastal behavior, a methodology for sandy beach stabilization by establishing sandy beaches was investigated. Its application was made to the Niigata coast. Pratically, in the application of the methodology the sediment source management must be made. Therefore, the fundamental problems were investigated referring to the Shizuoka coast, and principal methodology for the preservation of river deltaic coasts were proposed.
3)Applications of the methodology Applications were made to the Niigata and Joetsu-Ogat coasts. As the Niigata coast headlands have been being constructed, beach erosion control by structures, beach nourishment, and formation of sandy beaches were compared by numerical simulation. The third one, methodology for beach erosion control using headlands is the most effective for the long-term sandy beach stabilization. Applications of both the methodology and long-term shoreline prediction model were made to establish a possible method for sandy beach stabilization by the formation of stable sandy beaches on the Joetsu-Ogata coast. Less
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