Curriculum Vitaes
Profile Information
- Affiliation
- Professor, Faculty of Engineering, Department of Civil Engineering, Osaka Sangyo University
- Degree
- Ph.D(Mar, 2001, Gifu University)
- Researcher number
- 50356036
- J-GLOBAL ID
- 200901073146601850
- researchmap Member ID
- 5000092863
- External link
Research Interests
5Research Areas
3Research History
4-
Apr, 2011 - Present
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Apr, 2004 - Mar, 2011
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Apr, 2001 - Mar, 2004
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Apr, 1998 - Mar, 2001
Education
3-
Apr, 1994 - Mar, 1996
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Apr, 1989 - Mar, 1994
Committee Memberships
2-
Apr, 2015 - Mar, 2016
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Nov, 2014 - Feb, 2015
Awards
2Papers
47-
土木学会論文集 B2(海岸工学), 75(2) I_7-I_12, Oct 17, 2019 Peer-reviewed
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土木学会論文集B2(海岸工学), 72(2) I_919-I_924, Nov, 2017 Peer-reviewed This study deals with the process that tsunami flow on land collides with a vertical wall. A tip of the tsunami flow collides with the wall and runs up along the wall and then the water column collapses on the following tsunami flow. In this study, the characteristics of the tsunami impact force on the wall caused by splashdown of the run-up water column were experimentally investigated. From the measurement of the pressure synchronized with the high speed video images, it was found that the local maximum values of the pressure were caused by splashing down of the water column. We assumed this phenomenon was casting up of the water column and then freely falling on the following flow. On the basis of this assumption, the elapsed time from the collision to the splashdown can be explained by using the maximum depth of the passing tsunami flow. The pressure distributions were not a static pressure profile when the local maximum pressure was caused by splashdown of the water column.
Misc.
20-
28TH INTERNATIONAL CONGRESS ON HIGH-SPEED IMAGING AND PHOTONICS, 7126 ICHSIPS28, 2009The authors applied an ultra-high-speed video camera to visualize crack propagation in brittle bodies, such as mortar specimens, under the impact splitting test. Strain of the brittle bodies in impact splitting tests was analyzed by means of PIV (Particle Image Velocimtery), which is usually used for measurements of flow fields with tracer particles. The results show that, when the applied impulse on the mortar specimens is increased, the crack propagation velocity reaches an upper bound. The upper bound of the crack propagation velocity was 2.6 km/sec. The horizontal tensile strain around the crack tip was estimated to be 370 mu by PIV measurement with the ultra-high-speed camera, and 270 375 mu by strain gages, respectively. Those results showed a good agreement with each other.
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The 4th International Conference on Vortex Flows and Models, CD-ROM, 2008
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Transactions of Visualization Society of Japan, 27(2) 9-10, 2007 Lead authorThis study investigated about the continuity of momentum flux through an air-water interface. We conducted to measure air-flow and water-flow very close to a water surface in a wind wave tank using PIV technique. To evaluate of the continuity of momentum flux calculating from the friction velocity was very difficult, because we could not detect exact a mean water level to fit a log-law profile for the experimental data. The viscous stress affected not only the viscous sub layer but also the turbulent boundary layer. The ratio of the viscous stress in water-flow is from several percent to about ten percent. We deduced that the continuity of momentum flux calculating from the total stress was strongly affected by three-dimensional turbulent water-flow.
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Transactions of Visualization Society of Japan, 26(2) 53-54, Sep 15, 2006The characteristic of roll-wave flow, which is a flow with high Froude number which appears on the steep slope, is hardly known at present. In laboratory experiment, it was difficult to measure the flow profile which is a thin sheet flow having the characteristic of a wave and a flow.<BR>In this study we measured the velocity field of the roll-wave flow using PIV technique. We also investigated the behaviors of the velocity field in each region separated into five parts of one wave length. As a result, the relationship between velocity field and the water depth in each part was clarified. It also appeared that the velocity profile is grater than a log-law profile at every region.
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Transactions of Visualization Society of Japan, 26(2) 207-210, 2006The purpose of this research is to explore the mechanism required for the generation of earthquake vibration on the propagation velocity of the crack in fault plane. In this research, the impact splitting tensile tests of mortar and granite were carried out, and the propagation velocity of the crack was visualized and obtained by image analysis using ultra high-speed video camera. A relationship between the impulse which is impact loading and propagation velocity of the crack was observed. There appears to be a critical state in which propagation velocity does not increase, even if impulse is increased over it. It was proven to converge in 2.6 km/sec. Next, the mechanism of the development of the dynamics of the crack by the impulse was examined from displacement vector and Particle Image Velocimetry (PIV) analysis.
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Proceedings of the Coastal Engineering Conference, 2005- 1060-1071, Apr 1, 2005 Peer-reviewedIn order to clarify the mechanisms of wind waves, the air and water flows close to the water surface were simultaneously measured by using the Image Velocimetry, the IV. In this study, a Particle Tracking Velocimetry, so-called PTV, was used as IV, which can measure the velocity vectors in the vicinity of the water surface. The experiments were carried out in the range where whitecaps cannot appear. From the measured planar velocity distributions, the instantaneous vorticity distributions in air and water were evaluated.
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Proc. Asian and Pacific Coasts 2005, CD-ROM, 2005 Peer-reviewed
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Transactions of Visualization Society of Japan, 22 193-196, Jul 1, 2002Air flow over wind waves generated in a wind wave frame was visualized by water vapor, and instantaneous air flow fields over white-caps were obtained by a PIV system. Three air flow separation patterns were detected, which were decided by the situation of white-capping progress. The air flow separated from wind wave crest is accompanied by inverse flow at the forward face of wave crest. It was found that the frequency of air flow separation with inverse flow was about 6%. Also, the characteristics of the velocity distribution of the air flow field were compared with the mean wind velocity using conventional wind profiler.
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Proc. 8th Int. Sympo. Flow Modeling and Turbulent Measurements, IAHR, 429-436, 2001
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Proc. 8th Int. Sympo. Flow Modeling and Turbulent Measurements, IAHR, 381-388, 2001
Presentations
36Professional Memberships
5-
2002 - Present
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2001 - Present
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2000 - Present
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1996 - Present
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2010 - 2010
Major Research Projects
15-
科学研究費助成事業 基盤研究(C), 日本学術振興会, Apr, 2022 - Mar, 2026
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Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2018 - Mar, 2021
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Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2013 - Mar, 2016
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Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, 2008 - 2010
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科学技術振興調整費, 文部科学省, Apr, 2001 - Mar, 2004
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科学研究費助成事業 特別研究員奨励費, 日本学術振興会, 1998 - 2000
Academic Activities
3-
Planning/Implementing academic research土木学会海岸工学委員会, Jul, 2015 - Nov, 2020
研究テーマ
3-
研究テーマ（英語）陸上遡上する津波によって構造物に作用する波力に関する研究キーワード（英語）水理実験，可視化実験，モデル化研究期間（開始）（英語）2013/04/01
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研究テーマ（英語）海洋における風波の発達過程の解明とそのモデル化に関する研究キーワード（英語）風波、波浪推算、可視化実験、数値解析概要（英語）・研究期間（開始）（英語）1999/04/01
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研究テーマ（英語）海岸における砕波機構の解明に関する研究キーワード（英語）砕波、海岸保全、可視化実験、数値解析概要（英語）・研究期間（開始）（英語）1993/04/01