Coastal Bottom Boundary Layers And Sediment TransportThis book is intended as a useful handbook for professionals and researchers in the areas of Physical Oceanography, Marine Geology, Coastal Geomorphology and Coastal Engineering and as a text for graduate students in these fields. With its emphasis on boundary layer flow and basic sediment transport modelling, it is meant to help fill the gap between general hydrodynamic texts and descriptive texts on marine and coastal sedimentary processes. The book commences with a review of coastal bottom boundary layer flows including the boundary layer interaction between waves and steady currents. The concept of eddy viscosity for these flows is discussed in depth because of its relation to sediment diffusivity. The quasi-steady processes of sediment transport over flat beds are discussed. Small scale coastal bedforms and the corresponding hydraulic roughness are described. The motion of suspended sand particles is studied in detail with emphasis on the possible suspension maintaining mechanisms in coastal flows. Sediment pickup functions are provided for unsteady flows. A new combined convection-diffusion model is provided for suspended sediment distributions. Different methods of sediment transport model building are presented together with some classical models. |
Contents
CHAPTER 1 BOTTOM BOUNDARY LAYER FLOW | 1 |
CHAPTER 2 SEDIMENT MOBILITY BEDLOAD AND SHEETFLOW | 95 |
CHAPTER 3 BEDFORMS AND HYDRAULIC ROUGHNESS | 129 |
CHAPTER 4 THE MOTION OF SUSPENDED PARTICLES | 161 |
CHAPTER 5 SEDIMENT SUSPENSIONS | 201 |
CHAPTER 6 SEDIMENT TRANSPORT MODELS | 263 |
CHAPTER 7 LOOSE ENDS AND FUTURE DIRECTIONS | 293 |
| 309 | |
| 313 | |
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Common terms and phrases
applied approximately assumed average becomes bed shear stress bed-load boundary layer calculated changes close combined compared component considered constant contribution convective corresponding crest defined derived described diffusion direction discussed distribution drag eddy viscosity effective elevation energy dissipation Equation estimate example experiments expression factor field Figure flat beds fluid flux force formula friction function given gradient grain height Hence horizontal increase indicate laminar length magnitude measured motion moving natural Nielsen observed oscillatory flow period pickup predicted present profiles pure range reasonable relative respect result ripples roughness sand beds scale sediment concentrations sediment particle sediment transport sediment transport rate settling velocity shape Shields parameter similar simple Sleath smooth solution steady flow structure suggested suspended sediment time-averaged turbulence uniform upward values vertical wave