SEDIMENT RESPONSES TO NATURAL WAVES

Alexander F. Nielsen, Angus D. Gordon

Abstract


This paper is concerned with wave-induced seabed forcing functions and sediment responses on the Australian South East Continental Shelf. The transfer of surface displacement energy to near-bed oscillatory water movement energy is examined with respect to linear and second order wave theories. Seabed sediment responses are examined by comparing field bedform size data to laboratory data with a view to determining characteristic spectral parameters that may be applied with existing theories to predict sediment responses under natural wave spectra. A rippled bed incipient motion criterion incorporating the contribution to boundary shear stress made by the presence of bedforms as well as particle size is developed empirically from field data using dimensional analysis techniques.

Keywords


natural waves; sediment response

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