The bed-step and pool fomation in the Kisu River, Yamizo Mountains

概要

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In the Kisu River in Yamizo Mountains, there are step-pool structures on their river bed. The step is composed of boulders accumulated and the pool is concave with minor amounts of sands and smaller gravels. Bigger boulders derived from sheets of basalt in river banks and river beds could be moved sometimes by floods. Bigger boulders could be often caught by projections and/or fractures in the river bed. As a result, bigger boulders could make a stable accumulation body on the river bed. The whole accumulation body might be stable for high stage water, such as every several tens years. Even though only one boulder of an accumulation body might be derived, other boulders of the body could be easily flowed.
日本堆積学会の論文