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タイトル: Long Waves around a Convex or Concave Bottom
その他のタイトル: 凸または凹型の海底のまわりの長波
著者: Momoi, Takao
著者(別言語): 桃井, 高夫
発行日: 1967年3月31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44冊第4号, 1967.3.31, pp. 1465-1499
抄録: Numerical calculations of the long waves around a convex or concave bottom have been made to elucidate the behaviors of the waves around an obstacle and to determine an effective mesh length in the construction of a refraction diagram of tsunamis. Since the invading waves are treated as periodic ones in this work, a straightforward application of the theory to the evaluation of the effective mesh length for the leading part of tsunamis might be a little dubious (for the later phase, the present results are applicable). But when a dimension of the irregular part of the bottom (a simple hump) is small as compared with a wave-length of the incident waves, an interference effect produced by a coupling of the progressive and retrogressive waves is likely to be also small, so that the application of the results of the periodic waves might be still possible to the leading part of tsunamis dismissing the tip of the leading waves in which no interference effect taking place in the case of periodic waves is expected. In the present study, two typical tsunamis, i.e. the Chile Tsunami and Niigata Tsunami, have been employed to determine the actual negligible dimensions of the bottom irregularities. Furthermore, in the last section, some mention is made of the waves scattered by the submarine obstacle.
本報告において,凸または凹型の海底のまわりの長波が論じられ,電子計算機による津波屈折図作製の際の有効網目の長さ(effective mesh length)の決定がおこなわれている.とくに,海底凹凸にもとづく散乱波の状態について,二三論及されている.
URI: http://hdl.handle.net/2261/12305
ISSN: 00408972


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