Abstract
It is important to evaluate the effect of vegetations on the management of floods and river environment. In general, hydraulic effects of vegetation on flood flows are taken account by the permeability coefficient of vegetation and roughness coefficient, but these coefficients can not always be determined reasonably for various scales of flood and form of channel and vegetation. Objectives of this paper are to find a method assessing those coefficients from mutual relationship between flood, channel and vegetation.
For that purpose, we use the permeability coefficient of vegetation and roughness coefficient distributions determined by Fukuoka et al. 's analysis conducted on the Tone River and the Edo River floods, and find the relationship between these coefficients and vegetations and channel conditions.
