2003年7月九州地域豪雨災害調査報告 (速報)

DOI Web Site 被引用文献8件 参考文献4件
  • 谷口 義信
    宮崎大学農学部 (社)砂防学会2003年7月九州地域豪雨災害調査団

書誌事項

タイトル別名
  • Debris disaster caused by local heavy rain in Kyushu area on July 20th, 2003 (prompt report)
  • 2003年7月九州地域豪雨災害調査報告(速報)--水俣土砂災害
  • 2003ネン 7ガツ キュウシュウ チイキ ゴウウ サイガイ チョウサ ホウコク ソクホウ ミナマタ ドシャ サイガイ
  • Minamata debris disaster
  • 水俣土砂災害

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抄録

Alocal heavy rain hit Minamata City of Kumamoto Prefecture on 20th July in 2003. A large scale of disaster occurred in Hogawachi Atumari district and Fukagawa Shinyashiki district of Minamata City at about 4 in the morning(87mm/h of rain at 4)and it claimed the lives of 19 people. Both areas are composed of extremely weathering andesite in geology. The inclination of the collapsed slope of Hogawachi Atumari district is about 30° and that of Shinyashiki district is about 40°. The volume of the debris flow of the Atumari River was estimated in 1-1.5×105m3 and that of the slope failure of Shinyashiki district was estimated in 100-150m3 from the results of brief surveying or measurement of a laser profiler. The debris flow of the Atumari River flew straight down from the collapsed slope without damming up there. It is supposed that the debris flow was caused by the slope failure due to a rise of pore pressure of much seepage water into the weathering andesite layer with many cracks. The slope failure of Shinyashiki district which is called a surface failure was caused by the action of piping flow among the shallow talus accumulation layer. Sediment of the debris flow in the Atumari River consisted of 2 kinds of materials (muddy and gravelly one). It is said that the debris flow of the Atumari River ran for several ten minutes.

収録刊行物

  • 砂防学会誌

    砂防学会誌 56 (3), 31-35_2, 2003

    Japan Society of Erosion Control Engineering

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