"Abiki" the large seiche in the west coast of Kyusyu.
"Abiki'’ is the local name of the large seiche in the north west coast of Kyusyu. In 1979, March 31，“Abiki”occurred in the port of Nagasaki and its water height become above 2.8 m in the innermost part of the port. At the same time, an atmospheric pressure disturbance traveling to the east through the Goto-Nada, was observed and its amplitude was about 6 mb. Akamatu and Okada (1980) inferred that the progressive water wave amplified in the EastChina Sea by the resonance in relation to this travelling pressure disturbance, came into the port of Nagasaki and caused the “Abiki”． Hibiya and Kajiura (1982) succeeded in the numerical simulation of the“Abiki”caused by atmospheric disturbance and the results were in close agreement with the real water height records. They indicate that three essential processes are necessary for the occurrence of “Abiki". The first is the resonance explained above. The second is the refraction and reflection of the incident water wave by topographic effects in the Goto-Nada. The third is the amplification by the harbor resonance and shallow water effects of the port of Nagasaki. In this paper, using an almost similar numerical model, their experiment is followed up and the results are confirmed. From our results, it is indicated that the second process is most important. The incident water wave into Goto-Nada generates the local oscillation systems by reflection and refraction, and causes the seiches in the adjoining bay or port. Particularly, the short period oscillation which exists in the triangle of the Nisisonogi peninsula and Nomosaki off Nagasaki, is most important for the development of“Abiki”． Key words: Abiki (seiche), Numerical simulation, Travelling atmospheric disturbance, Harbor resonance, Local oscillation system
| Main Authors: | , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1983
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| Online Access: | http://hdl.handle.net/1834/16205 |
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