2006 Fiscal Year Final Research Report Summary
Development of GPS Measurement System and Characteristics Analysis for Long Period Gravity Wave That Induces Long Period Oscillation of Water Surface in Harbour
| Project/Area Number |
15360466
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Kobe University (2004-2006)
神戸商船大学 (2003) |
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Principal Investigator |
KOUGUCHI Nobuyoshi Kobe University, Graduate School of Maritime sciences, Professor, 海事科学部, 教授 (90234690)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIDA Hiroshi Kobe University, Graduate School of Maritime sciences, Professor, 海事科学部, 教授 (60031473)
DEGUCHI Ichro Osaka University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (00029323)
FUJII Hidenobu Oshima National College of Maritime technology, Professor, 商船学科, 教授 (10043928)
KUBOTA Takashi Oshima National College of Maritime technology, Assistant Professor, 商船学科, 助手 (40413843)
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| Project Period (FY) |
2003 – 2006
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| Keywords | Long period oceanic wave / Global Positioning System / Oceanic wave information / GPS buoy / MUSIC method / wave direction measurement / Port design / Mooring vessel |
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| Research Abstract |
When a harbor is designed, a general gravity wave (period about 0.1-10 second degree) causes various problems, but concerning about it some countermeasures are considered by marine engineering and results of research of civil engineering, and a considerable part is already solved. However a ship anchored or moored in a harbor is pitched and rolled by a long period gravity wave (for period dozens of seconds, several minutes), it's countermeasure cannot be still enough, and now some problems on a mooring line strength and cargo handling work are still remained. Such a long period wave (for the amplitude is less than dozens of cm, a period, about dozens of seconds, several minutes) that is propagated from the open sea and coastal waters area includes the following problems.
(1) A strong detachment and early flow are caused in harbor mouth neighborhood by long water particle exercise orbit of a long period surge, and they cause a harbor burying by drifting sand of bottom of the sea.
(2) By a
… More
strong detachment and early flow near harbor mouth, it causes a serious and security problem on a ship navigating a narrow area near harbor mouth.
(3) Wave energy of a long period gravity wave has a small propagation and reflection decrement, and after incidence to a harbor a greater part of the wave energy is kept and it may grow in the case of resonance with the harbor inherent frequency.
Then a dangerous pitching and rolling movements for a mooring or anchoring ship in the harbor are caused by it. These serious problems for harbor design and the anchorage in a harbor caused by such a long period wave is beginning to examine. There development of a study for a long period wave is expected immediately, because the cause and characteristics of a long period wave are not made clear yet.
In particular it is appear that a study to make clear the causes and the characteristics of a long period gravity wave on the basis of an observation fact is important. However it is difficult that the measurement is done by conventional wave observation technology, because a period of the long period gravity wave is too long and amplitude of it is too small compared with a normal gravity wave.
Therefore in this research arrayed wave observation buoys system whose 3 dimensional movements are measured precisely by the Carrier-Phase Differential GPS is proposed. In this proposed system, a wind wave direction which is observed in before Cloverleaf-Buoy and a 3 dimensional wave information of a long period wave are measured precisely. And an evaluation of effectiveness was carried out by the experiment on land and some computer simulations. As using this proposed system, it made clear the cause and characteristics of a long period gravity wave and solve some problems about a ship's mooring and anchoring or harbor design.
In near future, we will be able to clear the characteristics of the long period gravity wave and some problems about safety of port and mooring ship according to the long period gravity wave with the use of our proposed GPS Measurement System. Less
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Research Products
(35 results)
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[Journal Article] Experimental Results of Comparison between Velocity Integration and OTF Position on the Sea2005
Author(s)
Hou, D., Yoo, Y., Kouguchi, N., Ishida, H., Fujii, H., Itani, K.
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Journal Title
Proceedings of the Institute of Navigation National Technical Meeting 2005
Pages: 8
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Experimental Study on Arrayed Buoy GPS Wave Information Acquisition System-Results of Comparison Between GPS Buoy System and Sonic Wave Height and Current Meter-2004
Author(s)
Kouguchi, N., Yoo, Y., Hou, D., Ishida, H., Fujii, H., Deguchi, I.
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Journal Title
Proceedings of the International Offshore and Polar Engineering Conference Vol.14
Pages: 63-67
Description
「研究成果報告書概要(和文)」より
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[Journal Article] A General Concept and Performance Evaluation for GPS Arrayed Buoys Wave Observation System2004
Author(s)
Kouguchi, N., Yoo, Y., Hou, D., Ishida, H., Fujii, H., Deguchi, I.
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Journal Title
Proceedings of the Europe Navigation Conference GNSS 2004
Pages: 8
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Arrayed GPS-Buoys Wave Observation System2004
Author(s)
Kouguchi, N., Yoo, Y., Hou, D., Ishida, H., Fujii, H, Deguchi, I.
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Journal Title
Proceedings of the IEEE Oceans and Techno Ocean International Conference 2004
Pages: 6
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Experimental Study on Arrayed Buoy GPS Wave Information Acquisition System-Results of Comparison Between GPS Buoy System and Sonic Wave Height and Current Meter-,2004
Author(s)
Kouguchi, N., Yoo, Y., Hou, D., Ishida, H., Fujii, H., Deguchi, I.
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Journal Title
Proceedings of the International Offshore and Polar Engineering Conference Vol.14
Pages: 63-67
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] A General Concept and Performance Evaluation for GPS Arrayed Buoys Wave Observation System.2004
Author(s)
Kouguchi, N., Yoo, Y., Hou, D., Ishida, H., Fujii, H., Deguchi, I.
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Journal Title
Proceedings of the Europe Navigation Conference GNSS2004
Pages: 8
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Arrayed GPS-Buoys Wave Observation System.2004
Author(s)
Kouguchi, N., Yoo, Y., Hou, D., Ishida, H., Fujii, H, Deguchi, I.
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Journal Title
Proceedings of the IEEE Oceans and Techno Ocean International Conference (OTO' 04)
Pages: 6
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Experimental Results of Comparison between Velocity Integration and OTF Position on the Sea2004
Author(s)
Hou, D., Yoo, Y., Kouguchi, N., Ishida, H., Fujii, H., Itani, K.
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Journal Title
Proceedings of the Institute of Navigation National Technical Meeting
Pages: 8
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Development and Experimental results of GPS Wave Direction Finding System.2003
Author(s)
Fujii, H., Kouguchi, N., Ishida, H., Deguchi, I.
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Journal Title
Proceedings of the 16th International Technical Meeting GPS 2003, Institute of Navigation, Portland, USA
Pages: 75-83
Description
「研究成果報告書概要(欧文)」より
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