Abstract
In the case of the stony bed river with wide grain size distribution, boulders, which would not move during a flood, act as strong resistance element to the fluid. The other side, sand and gravel can stay in the bed irregularities formed by boulders. Therefore, the stony bed river will be in the stationary equilibrium condition of no sediment transport when the river bed form and grain size distribution corresponding to tractive force are established. However, in the past river bed variation analysis, this essential mechanism in the stony bed river can not be taken into consideration. In this study, we developed a new method of 1-D bed variation analysis in the stony rivers with well graded sediment stony rivers by considering the riverbed's stability mechanism by boulders, and we verify the applicability of the present model by the field experiment carried out in the Joganji River.
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