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Study on the time variation of sediment discharge after gigantic landslide at volcanic area in south-east Asia

东南亚火山区特大滑坡泥沙排沙时间变化研究

基本信息

批准号：
17405003
负责人：
SASAHARA Katsuo
金额：
$ 7.7万
依托单位：
Kochi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17405003/
关键词：
Volcano Landslide Disaster prevention 山体崩壊土砂流出火山地域東南アジア

项目摘要

In order to examine the mechanism of gigantic landslide occurred at March 26, 2004 in the caldera of Mt Bawakaraeng, South Sulawesi, Indonesia and know the time variation of sediment discharge from deposition of the landslide mass, Field survey and the analysis of satellite images were carried out. The results are as follows.(1) Sediment discharge from deposition of Landslide mass was the largest at first year after landslide, then were greatly decreasing at second and third year. This tendency is quite same with the sediment discharge from the pyroclastic deposit just after the volcanic eruption. With the sediment discharge, gully erosion was going to developing at the landslide deposition. At first year, the width and depth of the gully became larger, while width of the gully was still became larger at second and third years. It means that gully side wall was greatly eroded at second and third years.(2) The analysis of the route of radioactive tracer was tried in order to know the runout distance of eroded sediment in the Jeneberang River which flows down from Mt Bawakaraeng. But because the amount of sampling of sediment discharge was too small for the radioactive tracer analysis, runout distance of the sediment could not be well made clear. More sampling of discharged sediment is necessary in order to attain the purpose.(3) The mechanism of occurrence of landslide was examined by geological and geotechnical methods. The weak laminar at the bottom of the collapsed slope was made clear to be the key of the landslide occurrence. It seemed that the laminar collapsed at first, and whole slope followed to move downward.

为探讨2004年3月26日印度尼西亚南苏拉威西省巴瓦卡拉昂山破火山口特大滑坡发生的机理，了解滑坡体堆积来沙的时间变化规律，进行了现场调查和卫星影像分析。结果表明：(1)滑坡后第1年，滑坡体的淤积输沙量最大，第2年和第3年又大幅度减少。这一趋势与火山喷发后火山碎屑沉积排出的泥沙十分相似。随着来沙的增加，滑坡淤积区的冲沟侵蚀逐渐发展。第一年，沟宽和沟深变大，第二年和第三年，沟宽仍然变大。为了解流经巴瓦卡拉峰的仁尼伯朗河侵蚀泥沙的径流距离，对放射性示踪途径进行了分析。但由于排放泥沙采样量太少，无法进行放射性示踪分析，无法很好地确定泥沙的跳动距离。为了达到这一目的，需要对排出的泥沙进行更多的取样。(3)采用地质和岩土工程方法对滑坡的发生机理进行了探讨。崩塌边坡底部的软弱层流是滑坡发生的关键。似乎先是层流坍塌，然后是整个坡面向下移动。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

衛星観測高精度DEMによるインドネシア国バワカラエン山の大規模崩壊後の土砂流出の経年変化把握

利用高精度卫星观测 DEM 了解印度尼西亚 Bawakaraen 山大规模塌陷后泥沙流出量的长期变化

DOI：
发表时间：
2008
期刊：
日本地すべり学会誌 45-2
影响因子：
0
作者：
清水孝一;他
通讯作者：
他

分解能の異なる衛星画像DEMによる大規模崩壊の解析

不同分辨率卫星影像DEM分析大面积塌陷

DOI：
发表时间：
2006
期刊：
日本写真測量学会平成18年度年次学術講演会発表論文集
影响因子：
0
作者：
Tomoyoshi Miyazaki;Motohiro Kurebayashi;Takashi Yamada;Tomomi Maruyama;小山内信智他;小山内信智他
通讯作者：
小山内信智他

The results of monitoring of erosion of deposition mass generated by gigantic landslide with satellite images.

利用卫星图像监测巨型滑坡沉积物侵蚀的结果。