抄録
The extension of relative elevation between low-water course and alternating bars is one of the typical figures in gravel-bed river with much vegetation and that makes strong meandering flow and bank erosion on the opposite side of forested bars in several medium-size floods. In this study, such a morphological change in gravel-bed river is investigated from a view point of interaction between wood land expansion and alluvial process of alternating bars. A depth-averaged flow and bed-variation analysis is carried out considering the events of invasion and destruction (wash-out) of riparian vegetation. Results of the simulation model show extension of relative height due to bed degradation in low-water course and deposition in vegetation zones and immobilization of forested bars which can be seen as resent channel characteristics of gravel-bed river.
