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Change of topography and prediction of sediment disaster after the Chi-chi earthquake in Taiwan

台湾集集地震后地形变化及泥沙灾害预测

基本信息

批准号：
17405033
负责人：
SHIMOKAWA Etsuro
金额：
$ 5.91万
依托单位：
Kagoshima 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-17405033/
关键词：
Taiwan 1999 Chi-Chi Taiwan Earthquake Change of topograph Hydrologic observation Slope failure Debris flow Disaster prevention International joint research 国際研究者交流

项目摘要

The Chi-Chi Taiwan Earthquake on September 21, 1999 killed many people and involved great property loss. Also, it triggered many slope failures and debris flows in the mountainous regions. The resulting sediment movement caused sediment disasters at every heavy rain. This study aimed to examine the prediction of sediment disaster and the change of topography following the earthquake based on the field investigations. The results are summarized as follows :1. Changes of topography of slopes and river channels following the earthquake ware clarified quantitatively in the study area (10.76km^2)in central Taiwan. More than 131 slope-failure scars have been identified through aerial photographic interpretation. The slope-failure area is 1.35km^2, representing 12.5% of the study area. The sediment from slope failures flows out to the lower reaches of the river at every heavy rain. The outflow of the sediment changes the river topography at the same time as it causes sediment disasters.2.19 courses of traverse were installed in altitude 800m-1100m, and change of the topography was surveyed every year in the main river channel of the study area. The long-term topography changes following the earthquake were quantitatively clarified based on the survey results.3. Although debris flows had occurred about once per year in the study area before the earthquake, they occurred 20 times or more after the earthquake. Older and more recent debris-flow terraces are observed along the river in the study area. In Taiwan, severe earthquakes have occurred repeatedly in the past, and sediment movement resulting from earthquakes is considered to be the main cause of change in mountain and river topography.4. In order to research the characteristics of debris flows after the earthquake, debris flow was observed using the video camera. The big debris flow was observed also in 2007.

1999年9月21日发生的台湾集集地震，造成多人死亡、财产损失巨大。此外，还引发了山区多处边坡崩塌和泥石流。由此产生的泥沙运动，每次大雨都会引发泥沙灾害。本研究旨在基于现场调查研究地震后泥沙灾害和地形变化的预测。研究结果如下： 1．定量阐明了台湾中部研究区（10.76km^2）地震后斜坡和河道地形的变化。通过航空摄影解释已识别出超过 131 个边坡破坏疤痕。边坡失稳面积1.35km^2，占研究面积的12.5%。每次大雨时，斜坡崩塌的泥沙就会流到河流下游。泥沙外流在造成泥沙灾害的同时也改变了河流地形。2.19在海拔800m-1100m处设置了导线，每年对研究区干流河道进行地形变化调查。根据调查结果定量明确了震后地形的长期变化。 3．尽管地震前研究区每年大约发生一次泥石流，但地震后却发生了20次甚至更多。在研究区沿河观察到较古老和较新的泥石流阶地。台湾地区过去曾多次发生强烈地震，地震引起的泥沙运动被认为是山地、河流地形变化的主要原因。 4．为了研究震后泥石流的特征，利用摄像机对泥石流进行了观测。 2007年也观测到了特大泥石流。

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）

Damage caused by typhoon Nabi to slopes bordering forest roads in the Takakuma Experimental Forest, Kagoshima University, in September 2005

2005 年 9 月，台风“彩蝶”对鹿儿岛大学高熊实验林森林道路边缘的斜坡造成破坏

DOI：
发表时间：
2006
期刊：
Res. Bull. Kagoshima Univ. For. 34
影响因子：
0
作者：
TERAMOTO;Y
通讯作者：
Y

九州火山地域における土砂災害とその対策(Sediment Disasters and Theme Countermeasures in Volcanic Area of Kyushu,Japan)

日本九州火山区泥沙灾害及主题对策

DOI：
发表时间：
2005
期刊：
Proc.2005 International Conference on Himslope Stabilization and Environmental Restoration
影响因子：
0
作者：
TERAMOTO;Y;地頭薗隆;地頭薗隆;地頭薗隆;TERAMOTO Yukiyoshi;TERAMOTO Yukiyoshi;TERAMOTO Yukiyoshi;下川悦郎;地頭薗隆
通讯作者：
地頭薗隆

Sediment Disasters and Their Countermeasures in Volcanic Area of Kyushu, Japan

日本九州火山区泥沙灾害及其对策