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Hidekazu TSUJI Last modified date:2023.11.22

Graduate School

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 Reseacher Profiling Tool Kyushu University Pure
Academic Degree
Doctor of Philosophy in Science
Country of degree conferring institution (Overseas)
Field of Specialization
Physical Oceanography, sicalFluid dynamics, nonlinear physics
Total Priod of education and research career in the foreign country
Outline Activities
"Modeling of the Internal Waves in the Ocean"
Internal waves in the ocean has large amounts of energy and plays some important roles in the ocean processes. Using the ocean model its detail in specific sea areas are investigated.

"Nonlinear Wave Phenomena in Fluid"
While the nonlinear phenomena take on highly complex aspect, there are some coherent structure --- vortex, solitary wave etc. My research aims to understanding of this structure. I investigate, theoretically,numerically and experimentally, two-dimensional interaction of the solitary waves and waves generated in the flow by topography etc.
Research Interests
  • Numerical Modeling of Internal Tides in the East China Sea
    keyword : Internal Tides, East China Sea
  • unsteady amplification of the nonlinear wave and formation of giant waves in shallow water system
    keyword : Shallow water, nonlinear, solitary wave, freak wave
    2005.01Unsteady amplification of the shallow water wave is studied using nonlinear model equation..
  • Two-dimensional Interaction of the internal wave in two-layer fluid with infinite depth
    keyword : stratified fluid, internal wave, two-dimensional interaction,solitary wave
    2000.01~2001.01Oblique interaction of internal solitary waves in a two-layer fluid system with infinite depath is studied..
  • Two-dimensional Interaction of Modified KdV soliton
    keyword : modified KdV equation soliton two-dimensional interaction
    2002.01~2003.01Two-dimensional interaction of the Modified KdV soltions is studied..
Academic Activities
1. Hidekazu Tsuji and Masayuki Oikawa , Two-dimensional interactions of solitons in a two-layer fluid of finite depth , Fluid Dynamics Research, 10.1088/0169-5983/42/6/065506, 42, 6, 065506, 2010.12.
2. Y Kodama, M Oikawa and H Tsuji , Soliton solutions of the KP equation with V-shape initial waves, Journal of Physics A: Mathematical and Theoretical, vol.42 312001(9pp), 2009.07, [URL].
3. Hidekazu TSUJI, Masayuki OIKAWA, Oblique interactions of solitons in an Extended Kadomtsev-Petviashvili Equation, Journal of the Physical Society of Japan, Vol.76 (2007) 084401, 2007.08.
4. Hidekazu TSUJI, Masayuki OIKAWA, Oblique interaction of internal solitary waves in a two-layer fluid of infinite depth, Fluid Dynamics Research, 10.1016/S0169-5983(01)00026-0, 29, 4, 251-267, Vol.29(2001)251-267, 2001.12.
5. Hidekazu TSUJI, Masayuki Oikawa, 2-Dimensional Interaction of Internal Solitary Waves in a 2-Layer Fluid, Journal of the Physical Society of Japan, 10.1143/JPSJ.62.3881, 62, 11, 3881-3892, Vol.62 No.11 3881-3892 1993, 1993.11.
1. Hidekazu TSUJI and Naoki HIROSE, Numerical Analysis of Internal Tides and the Influence of the Kuroshio at Continental Slope in the East China Sea, The 17th Japan-Korea Joint Seminar on Ocean Sciences, 2023.04, It is recognized that, in the global ocean, the large amount of tidal energy is converted from barotropic to baroclinic internal tide which is then one of the main source of the turbulent energy dissipation. The process of energy transfer is greatly affected by topography, tidal motion, and ocean currents, and is expected to vary from region to region. For the East China sea (ECS) where has the one of the largest tidal energy in the world ocean, Niwa and Hibiya(2004) studied the M2 internal tides using numerical model analysis. We perform high-resolution numerical experiments of the Kuroshio with tidal motion on the continental slope of ECS for two summers in 2016 and 2017, when the Kuroshio axis and strength were significantly different. The distributions of barotropic-baroclinic energy conversion rates on the continental slope are compared to assess sensitivity to initial and boundary conditions. Sensitivity assessment shows that the Kuroshio mean flow plays an important role in determining the distribution of the energy conversion. Frequency analysis of domain-averaged conversion rates showed that the contribution of higher-frequency motions, including the M2 period, to the time-mean conversion rate is comparable to that of lower-frequency. The depth- integrated baroclionic energy fluxes and conversion rates are roughly in balance. They are positve in most areas, but negative in some domains due to the complex topography and tidal flow. These results provide fundamental and important insight into the coupling the Kuroshio including the frontal waves with tidal motion..
2. Hidekazu TSUJI, Numerical Study of Nonlinear Wave Equation Using Lattice Boltzmann Method, The 12th AIMS Conference on Dynamical Systems, Differential Equations and Application, 2018.07.
4. Experiment on Two-dimensional Interaction of Solitary Waves
5. Two-dimensional interaction of solitary waves of Benney-Luke equation
6. Asymmetric two-dimensional interaction of solitary wave in two-layer fluid.
Membership in Academic Society
  • The Oceanographic Society of Japan
  • Japan Society of Fluid Mechanics
Educational Activities
Teaching graduate course student(Depertment of Earth System Science and Technology)
Other Educational Activities
  • 2010.04.
  • 2011.04.