再造林放棄地における作業道からの生産土砂量と表層崩壊の発生

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  • Sediment Yield from Forestry Work Roads and the Occurrence of Shallow Landslides in Abandoned Forests after Plantation Clearance in Kagoshima Prefecture

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<p>  We investigated the temporal variations in sediment yield from forestry work roads, the occurrence of shallow landslides, and the stability of topsoil on susceptible steep slopes in abandoned forests after plantation clearance within an area of Shirasu (Ito pyroclastic flow deposits) in Kagoshima Prefecture. Forest clearance was conducted in October 2007. Sediment yield from work roads peaked between October 2007 and September 2009, and then decreased over time; this decrease was due to an increase in the rate of water infiltration caused by vegetation spreading onto the surface of the roads, and onto the cutting and filling slopes. We also conducted a field survey to predict the occurrence of shallow landslides on susceptible steep slopes. The minimum values of topsoil thickness in areas where shallow landslides had occurred decreased with increasing slope inclination. The topsoil thickness of steep slopes on which landslides had not yet occurred exceeded the minimum values. Hence, there is a high possibility of the occurrence of shallow landslides on these steep slopes due to future heavy rainfalls.</p>

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