紀伊山地中央部における谷中谷の形成と山体重力変形の発生

概要

論文の詳細を見る
To clarify the slope development history and to reveal the influence of long-term fluvial incision on the stability of side slopes in a tectonically active region, fluvial and hillslope landforms, especially inner gorge, fluvial knickzone, and gravitational slope deformation have been investigated in the catchment of the Nakahara River in the central Kii Mountains in the outer belt of southwest Japan. We found that inner gorge is developed surrounded by a paleosurface in the catchment of the Nakahara River and that the upstream end of the inner gorge coincides with a knickzone of the river. These facts suggest that the inner gorge was made by the recession of a knickzone, which was formed in response to the base level fall induced probably by mountain uplift. The recession of the knickzone undercut side slopes above the inner gorge, destabilizing them and inducing gravitational slope deformation on outfacing slopes.
2011-10-25