Accuracy of kinematic wave and diffusion wave approximations for spaceindependent flows with lateral inflow neglected in the momentum equation
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Error equations for the kinematic wave and diffusion wave approximations with lateral inflow neglected in the momentum equation are derived under simplified conditions for spaceindependent flows. These equations specify error as a function of time in the flow hydrograph. The kinematic wave, diffusion wave and dynamic wave solutions are parameterized through a dimensionless parameter which is dependent on the initial conditions. This parameter reflects the effect of initial flow depth, channelbed slope, lateral inflow and channel roughness when the initial condition is nonvanishing; and it reflects the effect of bed slope, channel roughness and acceleration due to gravity when the initial condition is vanishing. The error equations are found to be the Riccati equation. The structure of the error equations in the case when the momentum equation neglects lateral inflow is different from that when the lateral inflow is included. Copyright 1994 John Wiley & Sons, Ltd