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タイトル: 47. Tsunami in an L-shaped Canal[III]
その他のタイトル: 47. L字水路における津波[III]
著者: MOMOI, Takao
著者(別言語): 桃井, 高夫
発行日: 1966年3月25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43冊第4号, 1966.3.25, pp. 745-754
抄録: In a series of works already completed, the theories on a long wave in an L-shaped canal have been developed under the first, second and third approximations. In the present work, these theories are utilized to calculate the wave heights and phases for a canal of uniform width and for discussing the behaviors of the waves in the canal in question. Then the following facts are ascertained: - When kd(k: a wave number of the incident waves, d: a width of the canal) increases, the wave height of the reflected waves is linearly augmented from zero to amount to about 20 percent of that of the incident waves at kd=1.0. Then the advancing waves diminish monotonically in height to reach about 95 percent of the incident waves(if these values are evaluated in energy, the reflected waves for the range kd < 1.0 are at most 5 percent of the incident waves and the advancing waves are propagated nearly without loss of energy). As far as the phases are concerned, when kd is small, the reflected waves have a phase difference of π/2 from the incident waves. As kd increases, such a difference decreases linearly until the value reaches zero at kd■l.5. In other words, the incident and reflected waves make up quasi-standing waves, instead of complete standing waves, under the condition λ■4d (λ: a wavelength of the incident waves).
URI: http://hdl.handle.net/2261/12228
ISSN: 00408972


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