河道内植生の洪水による破壊および破壊規模に応じた再生・拡大過程を考慮した植生動態モデルの開発

抄録

A dynamic model for predicting the long term change of vegetated area in river was developed when the flood does not change the morphology of the gravel bar. In this simulation model, the expansion, destruction due to floods and regeneration of the plants were considered. In this study, the wash-out of plants and tree trunk breakage were considered as the destruction mechanism of the river vegetation due to floods. For elucidating the characteristics of regeneration of tree type vegetation, tree regeneration situation after 1year of the 2006 and 2007 flood event was investigated in the Arakawa River. The simulation model was applied to the middle stream reach of the Arakawa River for validating the change of vegetated area from 2000 to 2012. This model expressed the situation of vegetated area in 2012 within the reasonable limit. Especially, this model can be found to describe the location of each vegetation and expansion area of woody type vegetation by considering the tree’s regeneration and expansion after the trunk bending or breaking damage by floods.