Abstract
A practical approach for calculating the bottom shear stress beneath long-crested (2D) and short-crested (3D) nonlinear random waves is provided. The approach is based on assuming the waves to be a stationary narrow-band random process and by adopting the Forristall (2000) wave crest height distribution representing both 2D and 3D nonlinear random waves. Results are presented for laminar, smooth turbulent and rough turbulent flow. Examples are also included to illustrate the applicability of the results for practical purposes using data typical for field conditions; the mobile layer thickness in sheet flow representing rough turbulent flow; erosion of mud representing smooth turbulent flow and deposition of mud representing laminar flow.
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