IKONOS画像を利用した1999年ベネズエラ豪雨災害における斜面崩壊の解析

概要

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In December 1999, a cold front off the Caribbean Sea brought a large amount of rain to the Caribbean coastal area of northern Venezuela. Landslides and debris flows caused by the heavy rainfall led to enormous loss of lives and properties in the Avila Mountain ranges. The purpose of this study is to analyze the characteristics of landslide distribution using high spatial resolution (1m) satellite images of IKONOS. In the study area, Naiguata and Camuri Grande watersheds, landslides were categorized into two types through the field survey : 'rock slide' and 'debris slide'. Schist or gneiss of upper stream of the two watersheds underlies the rock slide, whereas phyllite with tuff near the coast underlies the debris slide. Comparing the landslide distribution to slope form and slope aspect using GIS (geographic information system), the following findings of landslide-prone slopes were obtained : 1) slope facing east or west in the schist region ; 2) slope facing northeast or north and southwest or south in the gneiss region ; and 3) convergent slope in the phyllite region. The slope plan form affects debris slide and the slope aspect of rock slide reflects the attitude of foliation of metamorphic rocks in the study area.
日本自然災害学会の論文
2003-05-30