WAVE STRESSES ON RUBBLE MOUND ARMOUR

Andrew Cornett, Etienne Mansard

Abstract


In this study, physical experiments are used to investigate the relationship between fluid velocities on the surface of two rubble-mounds and the shear stresses T and normal stresses a acting on the surface layer of rock armour. Results presented herein indicate that the peak magnitude of slopeparallel hydrodynamic forces on rubble-mound armour located below the still waterline can be reasonably well estimated using wave friction factors originally developed for rough turbulent oscillatory flow over impermeable horizontal beds. Stresses on rubble-mound armour are also compared to the prevailing surf similarity (Iribarren) parameter. The largest stresses are found to result from waves that form collapsing breakers.

Keywords


wave stresses; rubble mound; armor

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