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タイトル: The Effect of Asymmetric Insular Shelf in Trapping Long Gravity Waves around an Island
その他のタイトル: 島棚の非対称性が長波の捕捉に及ぼす影響
著者: 橋本, 道明
著者(別言語): Hashimoto, Michiaki
発行日: 1986年8月4日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第61冊第1号, 1986.8.4, pp. 67-95
抄録: The effect of asymmetric insular shelf in trapping long gravity waves around an island is investigated numerically by using a simple model. The model consists of a steep-sided, circular island which rises from the top of a circular sill of larger radius. The center of the island is placed off-center of the sill by Δr distance. The results are : (1) As the asymmetry becomes pronounced, the region of higher amplitude response shifts to the direction of the broader shelf. (2) The transfer function in the case of an asymmetric island can be estimated roughly by using the solution of a symmetric island model whose width of the round shelf coincides with the broadest width of the shelf in the asymmetric model. In water level observations at four stations around Oshima Island, a spectrum peak of period approximately 8 minutes could often be detected at the westernmost station. To understand this feature, numerical calculations were made both for the realistic Oshima-Island model (with actual bathymetry), and for the Island-Shelf model (which roughly approximated the topography of the Oshima Island area). And it was found that the oscillations of the observed peak period of 8 min. corresponded to a (1, 0) mode of edge wave. This mode is modified by the asymmetry of the insular shelf and forms a standing wave pattern with a node extending in the southwesterly direction vis-a-vis Oshima Island.
URI: http://hdl.handle.net/2261/12959
ISSN: 00408972


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