Abstract
In August 2016, Typhoon 1610 (Lionrock) caused heavy rainfall in Hokkaido, which led to the discharge of a large volume of sediment and water from catchments on the eastern slope of the northern Hidaka Range. The eight catchments examined in this study are characterized by granitic lithology and late Pleistocene periglacial landforms with weakly cohesive, low-resistance periglacial debris thickly covering the weathered bedrocks. This characteristic of the landscape presumably provided a transport-limited condition where some debris flows were initiated by shallow landslides. As they moved, the debris flows grew larger through mobilization and erosion of sediment in channel beds and sidewalls. This sediment mobilization and erosion continued for an extensive distance along the course of the river. Morphological changes induced by channel aggradation and bank erosion were considerable and distinctive from upstream to downstream. Granitic periglacial sediments are amply present on the mountain slopes, river channels, and river banks in the area, likely due to the rarity of intensive rainfall events. These distinctive features of fossil periglacial catchments are important for disaster prevention and catchment-scale sediment management in sub-boreal areas, particularly in the context of climate change, which may generate more frequent and intensive rainfall events.
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Acknowledgements
Disaster-related data and references were provided by the Hokkaido Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism and the Hokkaido Government. Discussion with Mio Kasai, Mari Igura and Daisuke Aoki on the 2016 event in western Tokachi was useful in development of the manuscript. This study was partially supported by the Japan Society of Erosion Control Engineering, the Sabo & Landslide Technical Center, the Japan SABO Association, and the River Fund of the River foundation, Japan.
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Furuichi, T., Osanai, N., Hayashi, Si. et al. Disastrous sediment discharge due to typhoon-induced heavy rainfall over fossil periglacial catchments in western Tokachi, Hokkaido, northern Japan. Landslides 15, 1645–1655 (2018). https://doi.org/10.1007/s10346-018-1005-1
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DOI: https://doi.org/10.1007/s10346-018-1005-1