利根川河道の樹木群透過係数と高水敷粗度係数

抄録

Vegetation management in the river is very important for not only flood control but also the river lives. Fukuoka et al.’ have estimated vegetation permeability and roughness coefficients of floods at the branch section of the Tone River and Edo River by the two-dimensional unsteady flow analysis using observed water levels with the time and space.

Based on their results, we examined the effect of vegetation permeability coefficients on the velocity field in the Tone River. Furthermore, we clarified the relationship between the vegetation permeability coefficient and the roughness coefficient of flood channel. From these investigations the roughness coefficients were found to be nearly constant as far as effects of vegetations are considered properly by the value of vegetation permeability coefficient in the unsteady two dimensional analyses.