石礫床河川の土砂移動機構を考慮した新しい河床変動解析法の構築(移動床(2),一般講演)

概要

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In a stony-bed river with wide grain-size distribution, boulders that resist movement during a flood act as strong fluid-resistance element. In addition, sand and gravel often remain in the bed irregularities formed by large stones. Therefore, a stony-bed river will remain in a static equilibrium condition, with no sediment discharge, when the river bed surface grain size distribution corresponding to tractive force of the flow are reached. However, conventional riverbed variation analysis does not account for this essential mechanism in stony-bed rivers. In this study, the authors developed a new method of one-dimensional bed variation analysis for stony-bed rivers with well-graded sediment by considering the riverbed's stability mechanism created by large stones. We verified the applicability of the model with data from field experimentation carried out in the Joganji River.
日本流体力学会の論文
2008-09-04