Author(s)

K. Mizumura

Abstract

Initial and boundary conditions are needed to solve the unsteady flow equations for flood routing in rivers. As the boundary conditions, inflow discharge hydrograph at the upstream boundary and a rating curve (stage - discharge relationship) at the downstream boundary are employed. But in the computation of long wave propagation the open boundary condi- tion is applied at the boundary and a rating curve is not necessary as in the computation of flood routing. Since the governing equations of the unsteady flow and the long wave propagation are essentially the same, the open boundary condition in the case of the computation of the long wave propagation is applicable to the case of the computation of flood routing. Introduction The computation of the flood routing is the most important sub

Keywords