Linear Depressions as a Sign of Landslides with Respect to the Development of Channel Systems

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  • 水系の発達からみた線状凹地と崩壊・地すべりとの関係
  • スイケイ ノ ハッタツ カラ ミタ センジョウ クボチ ト ホウカイ ジスベリ

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Abstract

Linear depressions are the graben-like landform on the crest slopes with multiple ridges or up-hill facing scarps. Deep-seated gravitational slope deformation (sagging) has been considered as the main cause of such depressions. The relation between formation of linear depressions and landslide occurrences are investigated with respect to the development of channel systems.<br>Drainage density of channelways and abandoned channelways are compared in two cases of the slopes with and without linear depressions, Here abandoned channelways are the shallow dry valleys covered with detritus transported from lateral slopes after past stream erosion. Though the drainage density of channelways is lower on the former slopes than on the latter, that of abandoned channelways indicates to the contrary.<br>Groundwater conductivity on the upper part of mountain slopes is thought to become high in the tension zones caused by deep-seated gravitational slope deformation. Consequently increased share of groundwater flow in total discharge in the tension zones prevents the development of channelways and promote that of abandoned channelways. Because groundwater infiltration is the main cause of landslides, linear depresions are considered to be a sign of landslide occurrences on the flank slopes.

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