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A research on the sediment disasters caused by heavy rainfalls in the western part of Japan, in July 1997

1997年7月日本西部强降雨泥沙灾害研究

基本信息

批准号：
09600003
负责人：
SHIMOKAWA Etsuro
金额：
--
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09600003/
关键词：
1997 Landslide disaster Heavy rainfall Izumi City Deep collapse Debris flow Warning and evacuation Disaster psychology

项目摘要

It rained heavily and recordically in western part of Japan on 6 to 15 July 1997. Landslides and debris flows which were caused by the torrential rainfalls, brought about serious damages with a heavy loss of lives in Kyushu and Hyogo prefecture. 21 persons were killed by debris flows at Harihara Izumi-shi Kagoshima pref. on 10 July. The purpose of this research is to investigate actual situations of these disasters and also to examine meteorological background of the heavy rainfalls, process and mechanism of the landslides and debris flows, warning and evacuation, disaster prevention and prediction and mental state of the sufferers. The results are summarized as follows.1.The heavy rainfall around Izumi-shi Kagoshima pref. on 9 to 10 July was created by stagnation of meso-scale of praecipitatio by topographical control of Koshiki-shima island under the stationary Baiu-front in the northern part of Kyushu.2.The debris flows at Harihara river on 10 July originated from a large-scale landslide caused by deep weathering of volcanic rocks and rising of ground water table under the heavy rainfall on a hillslope in the river catchment.3.The debris mass moved down at high speed along the river channel at the same time landsliding, pushing out the water in an irrigation pond and crashing against a check dam on the way, and attacked the Harihara residential area on the debris fan.4.A process of the debris flow from initiation through flow to terminal was reproduced by a simulation analysis.5.The warning and evacuation system of cities, towns and villages for the natural disasters was not completely prepared.6.According to the questionnaires to the sufferers at Harihara Izumi-shi, over 20 percents of them were screened as post-traumatic stress disorder.

1997年7月6日至15日，日本西部地区下了倾盆大雨。暴雨引发的山体滑坡和泥石流给九州和兵库县带来了严重的破坏和生命损失。Harihara Izumi-shi鹿儿岛县有21人死于泥石流。7月10日。本研究的目的是调查这些灾害的实际情况，并对暴雨的气象背景、滑坡和泥石流的过程和机制、预警和疏散、灾害预防和预报以及灾民的心理状态进行研究。主要研究结果如下：1.出水鹿儿岛周边的强降雨偏向。7月9日至10日的泥石流是由于九州北部静止的白云锋下的小木岛地形控制下的中尺度地形控制而造成的。2.7月10日的哈里原河泥石流是由于火山岩的深度风化和流域内山坡上的强降雨引起的地下水位上升引起的大规模滑坡。3.泥石体在滑坡的同时沿河道高速下移，冲出灌溉池塘的水，并在途中撞击淤地坝。4.通过模拟分析再现了泥石流从起始、流经到终点的过程。5.城市、乡镇和村庄对自然灾害的预警和疏散系统还没有完全准备好。6.根据对夏原出水医院患者的问卷调查，超过20%的患者被筛查为创伤后应激障碍。