Steady water surface profile of gradually varied flow can be calculated using ei-ther a steady flow approach or an unsteady flow approach. The steady flow approach requires it-erative procedures which may have convergence problems unless the step size 1x is less than amaximum value △x. The unsteady flow approach based on the explicit characteristic method hasa stability problem unless △x is less than △x. A series of numerical experiments were carried outand the results of two approaches are compared.
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