On the Computation of Roll Waves

The phenomenon of roll waves occurs in a uniform open-channel flow down an incline, when the Froude number is above two. The goal of this paper is to analyze the behavior of numerical approximations to a model roll wave equation ut + uux = u; u(x; 0) = u0(x); which arises as a weakly nonlinear approximation of the shallow water equations. The main diculty associated with the numerical approximation of this problem is its linear instability. Numerical round-o error can easily overtake the numerical solution and yields false roll wave solution at the steady state. In this paper, we rst study the analytic behavior of the solution to the above model. We then discuss the numerical diculty, and introduce a numerical method that predicts precisely the evolution and steady state of its solution. Various numerical experiments are performed to illustrate the numerical diculty and the eectiveness of the proposed numerical method.

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