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Run out processes of sediment and woody debris resulting from landslides and debris flow
Yamazaki, Yusuke Egashira, Shinji
Yamazaki, Yusuke
Egashira, Shinji
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2019
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Abstract
Process of sediment and woody debris transport generated by landslides and debris flows are simulated numerically using the depth-integrated two-dimensional forms for mass and momentum conservation equation with Egashira et al., (1997)’s formulas for resistance law and erosion-deposition formulas. In order to discuss woody debris behavior, a convection equation is formulated with erosion-deposition term where the yield of woody debris takes place proportionally to sediment erosion and deposition. A small drainage basin located within Akatani River basin of the Fukuoka Prefecture of Japan, where a large number of landslides and debris flows with woody debris occurred during a heavy rainfall event in 2017, is selected for this study. The numerical solution reproduced the spatial distribution of erosional area and depositional area, and run out volume of sediment at the outlet of the valley. The solution also reproduced the spatial distribution and run out volume of woody debris.
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