Accession Number : AD0227466

Title :   THE DAMPING OF OSCILLATORY WAVES BY LAMINAR BOUNDARY LAYERS,

Descriptive Note : Technical memo.,

Corporate Author : CORPS OF ENGINEERS WASHINGTON DC BEACH EROSION BOARD

Personal Author(s) : Eagleson, Peter S.

Report Date : AUG 1959

Pagination or Media Count : 43

Abstract : Results of an analytical and experimental investigation of the shearing stresses exerted on a smooth bottom by passage of oscillatory water waves are presented. Force measurements including time-history of instantaneous force during passage of waves and simultaneous measurements of instantaneous wave characteristics were made and corrected for pressure and inertia forces to obtain net tangential forces. Average resistance and damping coefficients were derived in terms of wave properties. Analysis of experimental results using these coefficients consistently showed experimental bottom shearing stresses greatly exceed those predicted by theory. The boundary layer was then assumed to be disrupted each half cycle due to flow separation, and periodic regrowth of the layer was calculated by the approximate momentum technique. Resistance and damping coefficients calculated on this basis show generally excellent agreement with experiment. (Author)

Descriptors :   *HYDRODYNAMICS, *NEOPLASMS, BOUNDARY LAYER, DAMPING, FLUID FLOW, LAMINAR BOUNDARY LAYER, OCEAN BOTTOM, OSCILLATION, SEDIMENTATION, SHEAR STRESSES, STRESSES.

Distribution Statement : APPROVED FOR PUBLIC RELEASE