Coastal bottom boundary layers and sediment transport [electronic resource] /
Peter Nielsen.
- Singapore : World Scientific, [2019], c1994.
- 1 online resource (xxiii, 324 p.) : ill.
- Advanced series on ocean engineering ; v. 4 .
- Advanced series on ocean engineering ; v. 4. .
Includes bibliographical references and indexes.
Bottom boundary layer flow. The boundary layer and the flow above it ; The nature of oscillatory boundary layers ; Oscillatory boundary layer models ; Wave-generated currents ; Wave-current boundary layer interaction -- Sediment mobility, bed-load and sheet-flow. Forces on sediment particles ; Incipient sediment motion ; Bed-load transport in steady flow ; Bed-load and sheet-flow under waves -- Bedforms and hydraulic roughness. Introduction ; Coastal bedform regimes ; Bedform dynamics ; Vortex ripples ; Bedforms in combined wave-current flows ; Hydraulic roughness of natural sand beds -- The motion of suspended particles. Introduction ; Settling velocity ; Equation of motion for suspended particles ; Accelerating sediment in a resting fluid ; Sediment particles in accelerated flow ; Sediment trapping by vortices ; Particles settling through turbulence -- Sediment suspensions. Introduction ; The nature of sediment suspensions ; Pickup functions ; Suspended sediment distribution models -- Sediment transport models. Introduction ; Transport models: in essence two varieties ; Shore normal transport over vortex ripples ; Shore normal sediment transport over flat beds ; Shore parallel sediment transport -- Loose ends and future directions.
This 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.