扇状地における土砂災害の実態に関する研究--主として,土石流による土砂の流出と堆積の特性について

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  • 扇状地における土砂災害の実態に関する研究 : 主として, 土石流による土砂の流出と堆積の特性について(林学部門)
  • センジョウチ ニ オケル ドシャ サイガイ ノ ジッタイ ニカンスルケンキュウ
  • Studies on the actual conditions of sediment disaster on alluvial fan : Properties of sediment transport and deposit by debris flow (Forestry)

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In order to make clear the actual conditions of debris flow disasters in our country and give the scientific ground to decision-standards for hazard zone, we arranged a lot of the latest data of sediment disasters and analyzed them. First, the occurrence frequency of debris flow, drainage area of mountain streams occured debris flow, depositing-flooding area of debris flow, amounts of transported debris and maximum gravel size were analyzed statistically by the country-wide data of sediment disasters caused between 1972 and 1977 year. As a result of considerations, their average properties could be found. Next, focussing on granite and metamorphic rocks zone which debris flow may very possible occure, the flowing-through distance of debris flow, bed slope of debris flow stoppage, surface gradient of deposits, lateral dispersive extent of debris flow and loctaional distribution of surface gravel size at the depositing place were considered in detail respectively by analyzing the topographical maps based on the aerial photographies before and after the disasters, field investigation and so on. Consequently, we could took many fruitful results for limitation of hazard zone.

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