IMHE OpenIR  > Journal of Mountain Science  > Journal of Mountain Science-2016  > Vol13 No.2
Field observations of debris-flow initiation processes on sediment deposits in a previous deep-seated landslide site
Fumitoshi IMAIZUMI; Satoshi TSUCHIYA; Okihiro OHSAKA
Corresponding AuthorFumitoshi IMAIZUMI
2016-02
Source PublicationJournal of Mountain Science
ISSN1672-6316
Volume13Issue:2Pages:213-222
Subtype期刊论文
AbstractAlthough information regarding the initiation processes of debris flows is important for the development of mitigationmeasures, field data regarding these processes are scarce. We conducted field observations of debris-flow initiation processes in the upper Ichinosawa catchment of the Ohya landslide, central Japan. On 19 June 2012, our video-camera 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 area. The first type was associated with the progress of surface flow from the upper stream on unsaturated channel deposits. The 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 saturation. The third type was associated with changes in the downstream topography caused by erosion. The flow velocity of most surges was less than 3 m s-1 and they usually stopped within 100 m from the initiation point. Surges with abundant pore fluid had a higher flow velocity (about 3 - 5 m s-1) and could travel for a longer duration. Our observations indicate that the surface flow plays an important role in the initiation of debris flows on channel deposits and talus slopes.
KeywordDebris Flow Initiation Zone Field Monitoring Ohya Landslide
DOI10.1007/s11629-015-3345-9
Indexed BySCI
Language英语
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/14068
CollectionJournal of Mountain Science_Journal of Mountain Science-2016_Vol13 No.2
Recommended Citation
GB/T 7714
Fumitoshi IMAIZUMI,Satoshi TSUCHIYA,Okihiro OHSAKA. Field observations of debris-flow initiation processes on sediment deposits in a previous deep-seated landslide site[J]. Journal of Mountain Science,2016,13(2):213-222.
APA Fumitoshi IMAIZUMI,Satoshi TSUCHIYA,&Okihiro OHSAKA.(2016).Field observations of debris-flow initiation processes on sediment deposits in a previous deep-seated landslide site.Journal of Mountain Science,13(2),213-222.
MLA Fumitoshi IMAIZUMI,et al."Field observations of debris-flow initiation processes on sediment deposits in a previous deep-seated landslide site".Journal of Mountain Science 13.2(2016):213-222.
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