Abstract
Theoretical one-dimensional method, estimating distribution discharge ratio is limited to apply to natural rivers because it is derived from condition with uniform flow in branch channels. Simple numerical model to understand flow characteristics and distribution discharge ratio of dividing flows has not been established even though it is important to understand the characteristics and distribution discharge ratio for flood control. In this paper, the explicit 2D-computed numerical model with square grid apply to compute flow pattern in experiment flume with bifurcation, the computed results agree with measured result of the flume. 2D shallow water model is applicable to dividing flows for obtaining flow characteristics and distribution discharge ratio.The results of numerical experiment with non-uniform flow condition indicates that downstream water level in the branch channels are related to the discharge ratio.
