崩壊発生場および崩壊土砂の流動化に与える地形的特性 : 1988 年広島県北西部土石流災害地における事例

Topographic characteristics to cause landslides and fluidization of their materials : From the debris flow disasters in the northwestern part of Hiroshima Prefecture in 1988

渡邊 哲也

海堀 正博

広島大学総合科学部紀要. IV, 理系編

Memoirs of the Faculty of Integrated Arts and Sciences, Hiroshima University. IV, Science reports

A large number of debris flows occurred in the northwestern part of Hiroshima Prefecture on July 21st in 1988. On the basis of the survey data and the result of analysis on the type of valley in topographic maps and comparison between the contour lines in topographic maps and summit level maps, we explained that the landslides on concave landform occurred easily on steep and undissected valleys and the failures of side slope and waterside tended to occur on dissected valleys. Moreover the courses of debris flows agree well with those that we estimated by the topographic analysis. The method with the topographic analysis in this report could be utilized to make a hazard map for the prevention of debris flow disasters.

debris flow

dissection

landform

landslide

summit level

valley

地球科学・地学・地質学 [ 450 ]

日本語

広島大学総合科学部

[作成日] 2006-03-21

[ISSN] 1340-8364

[NCID] AN10435936