| Project/Area Number |
20560472
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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 |
Hydraulic engineering
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| Research Institution | Niigata University |
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Principal Investigator |
IZUMIYA Takashi Niigata University, 自然科学系, 教授 (60151429)
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| Research Collaborator |
KOBAYASHI Yuuichi 新潟大学, 大学院・自然科学研究科, 博士前期課程
KANAI Makoto 新潟大学, 工学部・建設学科, 卒業研究生
SAKAI Mikako 新潟大学, 工学部・建設学科, 4年生
WATANABE Satoshi 新潟大学, 工学部・建設学科, 卒業研究生
HAKU Kouei 新潟大学, 大学院・自然科学研究科, 博士前期課程学生
ISHIBASHI Kunihiko 新潟大学, 工学部, 技術専門職員
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2008: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | 海岸工学 / 外部重力波 / 干渉合成法 / 津波干渉合成法 / 相互相関法 / Green関数 / Deconvolution法 / 波形予測 / 長周期波 / グリーン関数 / 地震波干渉法 / 相互相関関数 / 反射波 / 自己相関関数 / 共振 / 港内静穏度 / 風波 / 干渉合成 / 静穏度 / ゆらぎ / 自由波 |
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| Research Abstract |
A stochastic forcing model has been developed to estimate the heights of infragravity waves excited by short gravity surface waves. The model includes a wave equation for infragravity waves with the external force term due to pressure disturbances by short gravity waves. The analytical solution of the wave equation was obtained, and the root-mean-square value of the surface elevation of infragravity waves was estimated.. The rms value is proportional to the square root of the spectral moment of -2 order, m_<-2>, of short gravity waves, which is also proportional to the product of the wave height and the peak wave period or the significant wave period of short gravity waves.
The propagation of infragravity waves in intermediate water depths near and in a port is investigated with field observations. A Green function method which is used for seismic interferometry is applied to estimate wave profiles of infragravity waves. It is shown that when external forces are uncorrelated noise source, Green functions between two points can be retrieved by taking cross-correlation of records. The wave profiles of infragravity waves are estimated with the Green function and compared with the measured data. The agreement between them shows fairly good.
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