1994 Fiscal Year Final Research Report Summary
Analysis of Heavy Rainfalls Which Cause Debris Flows at Mt.Unzen and Construction of Advaced System for Disaster Prevention
| Project/Area Number |
05452379
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Natural disaster science
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| Research Institution | Nagasaki University |
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Principal Investigator |
ARAO Kimio Nagasaki University, Faculty of Education ; Prof., 教育学部, 教授 (40039425)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAOKA Shinji Nagasaki University, Faculty of Education ; Assoc. Prof., 教育学部, 助教授 (80244028)
TAKAHASHI Kazuo Nagasaki University, Faculty of Engineering ; Prof., 工学部, 教授 (30039680)
NAKANE Shigekatsu Nagasaki University, Faculty of Fisheries ; Prof., 水産学部, 教授 (50001590)
FUJIYOSHI Yasushi Nagoya Univ., Inst. for Hydros-Atmos.Sci. ; Assoc. Prof., 大気水圏科学研究所, 助教授 (40142749)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Unzen Volcano / Volcanic debris flow / Precipitaion system / Meteorological radar / Information of disasters / Risk control / Flows of mud and rock / Deposits of pyroclastic and debris flows |
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| Research Abstract |
The eruption of Unzen Volcano in Nagasaki Prefecture has caused very terrible damages at Shimabara and Fukae region. Our attention have been concentrated on the disasters derived from heavy rainfall and debris flow. The main results of this research project are as follows.
(1) The behavior of heavy rainfall systems which caused violent debris flows showed that small-sizedconvetive rain cell appeared near the southwestern region of Nagasaki Peninsula move to ENE growing very rapidly before landing on Shimabara Peninsula (region of Mt. Unzen). These traveling course and velocity of developing cells showed something in common. This fact indicates the promising immediate prediction of strong rainfall and debris flow.
(2) An extensive investigation on the risk control system agaist the debris flow disastars has been made in view of the problems on the transfer of urgent information and the induction of habitant to places of safety. The safety of people from debris flows have been fortunately kept up by the restriction of admittance for avoiding pyroclastic flows so far. However, the land area of no admittance is recently reduced because of decrease in pyroclastic activity ; so that the information on the meteorological coditions and warnings should be offered immediately in order to recommand the evacuation hereafter.
(3) It has been definitely shown by the geological investigation on the traces of pyroclastic and debris flows that even at the northern slope of Unzen Volcano, those flows originated with the volcanic activities had taken place so frequently as an interval of several to ten thousand years.
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