Abstract
Mega-landslides usually cause long-lasting subsequent sediment production, and long-term strategies for disaster mitigation are necessary in the case of such extreme events. The Ohya-kuzure landslide in central Japan is typical of sites where hillslope erosion and sediment yield have been continuously active since its formation in 1707. Sediment production is particularly active by debris flows in the headwater channels formed within the landslide. However, the dynamics of such debris flows in steep headwater channels have not been fully examined compared to those in gentler downstream reaches. To investigate the changes in headwater channel bed sediments remobilized mainly by frequent debris flows, repeated high-resolution measurements were carried out using terrestrial laser scanning. Freeze-thaw weathering in the surrounding slopes, which are composed of deformed shale and sandstone layers, delivers quantities of small particles onto the valley floor. Measurements in spring, summer, and autumn conducted over two years provided high-definition (0.1 m resolution) topographic datasets, revealing the seasonal amount of erosion and deposition to be on the order of 1000–5000 m3. Erosion and deposition along the reach also showed contrasting spatial patterns according to the sections bounded by knickpoints and valley narrows. These basic estimates of sediment production in headwater channels can be utilized for further mitigation of possible sediment-related disasters in downstream areas.
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Higuchi S, Tsuchiya S, Ohsaka O (2012) Large sediment movement caused by the catastrophic Ohya-Kuzure landslide. Chubu Forest Res 60:105–108 [in Japanese]
Hughes MW, Hughes MW, Quigley MC, van Ballegooy S et al (2014) The sinking city: earthquakes increase flood hazard in Christchurch, New Zealand. GSA Today 25(3):4–10. doi:10.1130/GSATG221A.1
Imaizumi F, Tsuchiya S, Ohsaka O (2005) Behaviour of debris flows located in a mountainous torrent on the Ohya landslide, Japan. Can Geotech J 42:919–931
Imaizumi F, Sidle RC, Tsuchiya S et al (2006) Hydrogeomorphic processes in a steep debris flow initiation zone. Geophys Res Lett 33:L10404. doi:10.1029/2006GL026250
Imaizumi F, Tsuchiya S, Ohsaka O, Ito H (2013) Surface runoff and fludification of grains on sediment surface of sands and gravels. Proc Jpn Soc Erosion Control Eng Annu Meet 2013: Pb–08 [in Japanese]
Imaizumi F, Hayakawa YS, Hotta N et al (2015) Interactions between accumulation conditions of sediment storage and debris flow characteristics in a debris-flow Initiation zone in Ohya landslide, Japan. Geophys Res Abstr 17:EGU2015–EGU7757
Imaizumi F, Trappmann D, Matsuoka N et al (in press) Biographical sketch of a giant: deciphering recent debris-flow dynamics from the Ohya landslide body (Japanese Alps). Geomorphology
Ishikawa Y (2011) Reevaluation of magnitude of Hoei earthquake in 1707 (in Japanese). Abstracts of the seismology society of Japan 2011 Fall Meeting D11–09. [in Japanese]
Ito S, Ogawa Y, Sekiya Y et al (1999) On the sediment budget and bed variation of the Abe River. Proc Hydraul Eng 43:719–724. doi:10.2208/prohe.43.719 [in Japanese with English abstract]
Keefer DK (1999) Earthquake-induced landslides and their effects on alluvial fans. J Sediment Res 69:84–104. doi:10.2110/jsr.69.84
Kondo R, Hashinoki T, Yasuda Y et al (2008) Observation of total load upstream of the Abe River. Sabo Gakkaishi 60(5):15–22. doi:10.11475/sabo1973.60.5_15
Korup O (2012) Earth’s portfolio of extreme sediment transport events. Earth Sci Rev 112:115–125. doi:10.1016/j.earscirev.2012.02.006
Korup O, McSaveney MJ, Davies TRH (2004) Sediment generation and delivery from large historic landslides in the Southern Alps, New Zealand. Geomorphology 61:189–207. doi:10.1016/j.geomorph.2004.01.001
Korup O, Clague JJ, Hermanns RL et al (2007) Giant landslides, topography, and erosion. Earth Planet Sci Lett 261:578–589. doi:10.1016/j.epsl.2007.07.025
Ministry of Construction (1988) History of sabo erosion controls in Abe-kawa River [in Japanese]
Nishikawa T, Takahashi M, Kato Y et al (2006) Current status of suspended sediment measurements in the Abe-Kawa River. Proc Jpn Soc Erosion Control Eng. [in Japanese]
Rowlands KA, Jones LD, Whitworth M (2003) Landslide laser scanning: a new look at an old problem. Q J Eng Geol Hydrogeol 36:155–157. doi:10.1144/1470-9236/2003-08
Sugiyama Y, AIST (2010) Geological map of Japan 1:200,000 Shizuoka and Omae-zaki, 2nd edn. Geological Survey of Japan, AIST [in Japanese with English abstract]
Teza G, Galgaro A, Zaltron N et al (2007) Terrestrial laser scanner to detect landslide displacement fields: a new approach. Int J Remote Sens 28:3425–3446. doi:10.1080/01431160601024234
Trustrum NA, Gomez B, Page MJ et al (1999) Sediment production and output: The relative role of large magnitude events in steepland catchments. Z Geomorphol Supplbd 115:71–86
Tsuchiya S, Imaizumi F (2010) Large sediment movement caused by the catastrophic Ohya-Kuzure landslide. J Dis Res 5:257–263
Uda T, Suzuki T, Oishi M et al (1994) Evaluation of volume and spatial shape of beach sand along Shizuoka Coast. Proc Coast Eng Soc Jpn 41:536–540. doi:10.2208/proce1989.41.536 [in Japanese]
Acknowledgements
Our research is funded by the Resarch Grant by Sabo & Landslide Technical Center, and JSPS KAKENHI Grant Numbers 26292077 and 25702014. This study is a part of CSIS Joint Research #413. We thank S. Ishikawa, N. Yumen, H. Mori, H. Yoshida, and students from Shizuoka University for their assistance in the field survey.
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Hayakawa, Y.S., Imaizumi, F., Hotta, N., Tsunetaka, H. (2016). Towards Long-Lasting Disaster Mitigation Following a Mega-landslide: High-Definition Topographic Measurements of Sediment Production by Debris Flows in a Steep Headwater Channel. In: Meadows, M., Lin, JC. (eds) Geomorphology and Society. Advances in Geographical and Environmental Sciences. Springer, Tokyo. https://doi.org/10.1007/978-4-431-56000-5_8
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