Temporal and spatial variation of infilling processes in a landslide scar in a steep mountainous region, Japan

Fumitoshi Imaizumi; Roy C Sidle; Asako Togari-Ohta; Makoto Shimamura

doi:10.1002/esp.3659

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Temporal and spatial variation of infilling processes in a landslide scar in a steep mountainous region, Japan

Journal article

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Temporal and spatial variation of infilling processes in a landslide scar in a steep mountainous region, Japan

Fumitoshi Imaizumi, Roy C Sidle, Asako Togari-Ohta and Makoto Shimamura

Earth Surface Processes and Landforms, Vol.40(5), pp.642-653

2015

DOI: https://doi.org/10.1002/esp.3659

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Abstract

landslide

infilling

soil creep

dry ravel

sediment flux

The duration of the soil-depth recovery needed for reoccurrence of shallow colluvial landslides at a given site in humid regions is much longer than the return period of rainfall needed to generate sufficient pore water pressure to initiate a landslide. Knowledge of the rate of change in soil depth in landslide scars is therefore necessary to evaluate return intervals of landslides. Spatial variation in sediment transport at the Kumanodaira landslide scar in central Japan was investigated by field observations. Spatial distribution of the rate of change in soil depth was estimated using sediment transport data and GIS analysis. Observations revealed that the timing of sediment transport differed for shallow and deep soil layers. Near-surface sediment transport (mostly dry ravel and some shallow soil creep at depths ≤0.05 m) measured in sediment traps was active in winter and early spring and was affected by freezing-thawing; soil creep of subsoil (i.e., >0.05 m), monitored by strain probes, was active in summer and autumn when precipitation was abundant. Near-surface sediment flux was estimated by a power law function of slope gradient. Deeper soil creep was more affected by relative location to the landslide scar, which influences soil depth, than by slope gradient. Our study indicated that the rate of soil depth recovery is high just below the head scarp of the landslide. Abrupt changes in the longitudinal slope topography immediately above, within and just below the head scarp became smoother with time due to degradation proximate to the landslide head scarp and flanks, as well as aggradation just below the head scarp. This article is protected by copyright. All rights reserved.

Details

Title: Temporal and spatial variation of infilling processes in a landslide scar in a steep mountainous region, Japan
Authors: Fumitoshi Imaizumi (Author) - Shizuoka University, Japan
Roy C Sidle (Author) - Environmental Protection Agency
Asako Togari-Ohta (Author) - East Japan Railway Company, Japan
Makoto Shimamura (Author) - University of Tokyo, Japan
Publication details: Earth Surface Processes and Landforms, Vol.40(5), pp.642-653
Publisher: John Wiley & Sons Ltd.
Date published: 2015
DOI: 10.1002/esp.3659
ISSN: 0197-9337
Organisation Unit: University of the Sunshine Coast, Queensland; Sustainability Research Cluster
Language: English
Record Identifier: 99449027202621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Geography, Physical; Geosciences, Multidisciplinary

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