雲仙岳に土石流を発生させた1991年6月30日の豪雨の微細構造

概要

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The heavy rainfall over Shimabara district in Nagasaki Prefecture on 30 June 1991 was studied with several interests in the fine structure of rain storms and their impact on a volcanic debris flow at the slope of Mt. Fugen. The Results are summarized as follows. (1) The rain cell which caused a large debris flow appeared at the western sea region in the first place at a distance of 60km from Mt. Fugen, and attacked the mountain region one hour later. This convective storm had a rainfall intensity of 20-25mm per 10 minutes at its landing on the mountain. (2) Almost all the rain cells detected in this district were originated at the western sea region and moved to the east in a mean velocity of 60km/h, excepting two rain cells which developed suddenly near the southwestern edges of strong rain cells of mature stage. (3) The behavior of rain storms in this debris flow event suggests that more critical eatch should be made against the developing rain cells on the western sea region in order to prevent the damage of debris flows.
長崎大学教育学部の論文
1993-03-00