特集：熱帯強風化地帯における地すべり地形のマッピングと，その危険度評価技術の開発
空中写真判読による大規模地すべり地形マッピングと危険度評価 －ベトナム・ホーチミンルートでの適用可能性－
2016 年 37 巻 1 号 p. 105-126
詳細
2016 年 37 巻 1 号 p. 105-126
In the central provinces of Vietnam, the frequency and severity of landslide events are apparently rising. The events cause substantial property damage, traffic disruption, fatalities along transport arteries and severely affect living conditions. However, in spite of the severe hazardous conditions no potential database of landslide exists. First, the authors clarified the distribution of landslide related phenomena by aerial photographic interpretation. Secondly, the authors’ field investigations revealed characteristics and tendencies of landslide movement with special reference to geologic types. Thirdly, the authors assessed the possibility of risk assessment using landslide mapping. The 685 large-scale landslide topographies were identified in six topographical map areas on a scale of 1:25,000. The data was transferred to GIS to create an inventory. The movement types and the spatial distribution of the landslide topographic area are related clearly to their geology, geological structure, and weathering features. Risk evaluation using an AHP approach also applies to each landslide unit. However, some limits of application were apparent there.
