Turbulent processes beneath bores approaching a shoreline over a sloping beach are modelled using a turbulence energy closure scheme. The procedure incorporates the simulation of turbulence production at the face of each bore together with shear-generated turbulence in the bottom boundary layer at the beach. The effect of these two sources of turbulence is represented by production terms in the turbulent energy quation and the solution of this determines the value of exchange coefficients which are then used to calculate the Reynolds-averaged flow conditions. Numerical experiments are described that relate to the approach of both a single bore and a train of periodic bores to the shoreline. The bottom stress is calculated and it is shown that it is strongly influenced by turbulence production at the face of the bore. © 1979.
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