北海道北部の山火事跡地にみられる崩壊裸地の時間的推移
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概要
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Since early 1900's most parts of the Neogene hill-lands in Northern Hokkaido have experienced forest fires several times. In the present-day, the slopes suffered forest fires are covered with Sasa vegetation, and many landslide scars are distributed on these slopes. The purpose of this paper is to explain the effect of forest fires on the occurrence and maintenance of landslides. Transitions of the areas of 275 landslide scars for the periods 1960-1970 and 1970-1975 are examined by photogrammetry. The areas of landslide scars are computed by the equation S=(H/f)^2(cosθ+r/fsinθ・cosα)^<-1>・S where S = area of landslide scar S=area of landslide scar on airphoto H=flying height f=focal length θ=slope angle of landslide scar r=distance between principal point and crest of landslide scar on airphoto α=angle between radial-line from principal point and direction of landslide scar on airphoto. The results of the examination are summarized as follows :
- 北海道大学の論文
- 1979-03-25