2001 Fiscal Year Final Research Report Summary
Development of a tsunami detection system using RTK-GPS
| Project/Area Number |
10354006
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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 |
固体地球物理学
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| Research Institution | University of Tokyo |
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Principal Investigator |
KATO Teruyuki University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (80134633)
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| Co-Investigator(Kenkyū-buntansha) |
ISSHIKI Hiroshi Hitachi Zosen Corp., Institute of Technology, Senior Researcher, 技術研究所, 主席研究員
KINOSHITA Masao Hitachi Zosen Corp., Institute of Technology, Associate Senior Researcher, 技術研究所, 主管研究員
TERADA Yukihiro Hitachi Zosen Corp., Institute of Technology, Senior Researcher, 技術研究所, 主席研究員
KAKIMOTO Eiji Hitachi Zosen Corp., Institute of Technology, Researcher, 技術研究所, 研究員
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| Project Period (FY) |
1998 – 2000
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| Keywords | GPS / tsunami / RTK-GPS / buoy / sea-level measurements |
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| Research Abstract |
We have developed a tsunami detection system using RTK-GPS technology. RTK-GPS is a real-time positioning system of moving platform using the Global Positioning System. First, we designed a buoy system that consists of two buoys; a spar type buoy of 8m long for putting a GPS antenna and a support buoy for putting GPS receivers, PC, butteries etc. These buoys are tethered using a single cable. We have conducted an experiment at the Sagami Bay, southern Kanto. Both of buoys were anchored about 900m offshore of the coast and the data were transmitted using radio. Hybrid system using solar panels and a wind generator was used for power supply on the buoy. After the transmission of data to land, the RTK processed data were monitored on the display of a PC that was set in the laboratory. The data was recorded continuously for about ten days without a single second of loss. The obtained data were compared with the tide gauge records placed nearby. The comparison suggested that the estimated sea-level has about 1cm accuracy. Then, in order to check the long-term stability and to examine the environmental robustness, we have conducted about one year of experiment in the Osaka bay. Frequency analysis of obtained data suggested that the effects of wind waves is superior in the range of less than several seconds and the longer period of tsunami could be detected by filtering technique. Thus, as a conclusion, the experiment was successful and the proposed buoy system may be utilized for tsunami warning because it can detect the arrival of tsunami before it reaches the coast. The second generation of tsunami-buoy is now operation offshore of Ofunato for monitoring at local government for watch tsunami.
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