Sheet Flow Sediment Transport and Swash Hydrodynamics

摘要: The unsteady nature of coastal hydrodynamics is associated with complex boundary layer dynamics and hence engineering predictions shear stresses sediment transport are difficult. This thesis explores some the hydrodynamic problems behaviour in zone seeks to provide new improved modelling approaches. latest experimental results used inform model development process. New laboratory experiments carried out as part this illustrate value convolution integral calculations for both pressure skin friction forces on particles bed. also highlight importance phase differences between free stream velocity stresses. use a “bed” stress input found be problematic whenever there large vertical gradient stress. work has helped improve our understanding sheet flow dynamics. builds these discoveries propose simplified framework prediction using integrals. time domain technique advantage simplicity while incorporating most important physical processes from more detailed models. could incorporated into any depth averaged software package. Boundary analysis techniques presented an effective roughness mobile beds can calculate instantaneous profiles throughout bed layer. solutions swash which limitations previous benchmark analytical hydrodynamics. It shown that real necessarily involves much larger influx mass momentum than solution was previously by many research community. Models presented.