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Field observations of debris-flow initiation processes on sediment deposits in a previous deep-seated landslide site

引用

Journal of Mountain Science 2016年第2期13卷 213-222页

作者： Fumitoshi IMAIZUMI Satoshi TSUCHIYA Okihiro OHSAKA Department of Environment and Forest Resources Science Faculty of AgricultureShizuoka University

Although information regarding the initiation processes of debris flows is important for the development of mitigation measures,field data regarding these processes are *** conducted field observations of debris-flow initiation processes in the upper Ichinosawa catchment of the Ohya landslide,central *** 19 June 2012,our videocamera monitoring systems recorded the moment of debris-flow initiation on channel deposits(nine surges) and talus slopes(eight surges).The initiation mechanisms of these surges were classified into three types by analyzing the video images: erosion by the surface flow,movement of deposits as a mass,and upward development of the fluid *** first type was associated with the progress of surface flow from the upper stream on unsaturated channel *** second type was likely caused by an increase in the pore water pressure associated with the rising in the groundwater level in channel deposits;a continuous water supply from the upper stream by the surface flow might have induced this *** third type was associated with changes in the downstream topography caused by *** flow velocity of most surges was less than 3 m s^(-1) and they usually stopped within 100 m from the initiation *** with abundant pore fluid had a higher flow velocity(about 3- 5 m s^(-1)) and could travel for alonger *** observations indicate that the surface flow plays an important role in the initiation of debris flows on channel deposits and talus slopes.

关键词： Debris flow initiation zone Field monitoring Ohya landslide

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