台風災害におよぼす局所地形の影響に関する研究 (III) : 1977 年台風 9 号 (沖永良部台風) による沖永良部島の風害について

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タイトル別名
  • STUDIES ON THE RELATIONSHIPS BETWEEN THE LOCAL TOPOGRPHY AND THE DAMAGES OF HOUSES HIT BY TYPHOON (III) : The Damages took place in Okinoerabu Island in September, 1977
  • 台風災害におよぼす局所地形の影響に関する研究-3-1977年台風9号(沖永良部台風)による沖永良部島の風害について
  • タイフウ サイガイ ニ オヨボス キョクショ チケイ ノ エイキョウ ニカンス

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We deduced regression equation, which can approximatey estimate a damage ratio of the houses hit by the Okinoerabu Typhoon, by means of quantification analysis with combination of some topographical factors. Then we made clear the effects of every factor. From the results, we made some following conclusions. (1) The kind and size of topographical factors, which have effects upon damage of houses hit by a storm, vary according to the undulation of the island. In an island, which undulates considerably, slope state has close connection with a damage ratio. But in the island, which does not undulate a great deal, effects of the sea have a close connection with a damage ratio. (2) We presented a new method which defines the scale of a topographical factor. The method analyzes the topographical wave length by cluster analysis. The scale is the range in which topographical wave changes occor. (3) Analysis of the topography is to analyze topographical wave length. (4) The results of interpreting aerial photographs of houses hit by a storm were accurate in showing complete destruction or half destruction of house.

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