Abstract
The bank-full channel characteristics for gravel bed and sand bed alluvial rivers are investigated theoretically and empirically. Two sets of equations for describing the bank-full channel width and average depth for gravel bed and sand bed alluvial rivers are obtained. One satisfies rational regime relations, the other satisfies a dynamic equilibrium condition for stable channels. Using these sets of equations, a dynamic equilibrium condition for stable channels is identified. Then existing data of natural rivers in Japan is used to verify these sets of equations as well as the dynamic equilibrium condition for stable channels. The condition is found to well match with the data of natural rivers with sediment size ranging from sand to gravel.
