Suspended Sediment Concentration Profiles in the Bottom Boundary Layer
Author | : Jingping Xu |
Publisher | : |
Total Pages | : 262 |
Release | : 1993 |
Genre | : Suspended sediments |
ISBN | : |
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Author | : Jingping Xu |
Publisher | : |
Total Pages | : 262 |
Release | : 1993 |
Genre | : Suspended sediments |
ISBN | : |
Author | : Palitha Nalin Wikramanayake |
Publisher | : |
Total Pages | : 222 |
Release | : 1994 |
Genre | : Hydrodynamics |
ISBN | : |
Author | : Peter Nielsen |
Publisher | : World Scientific Publishing Company |
Total Pages | : 340 |
Release | : 1992-07-21 |
Genre | : Technology & Engineering |
ISBN | : 9813103582 |
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.
Author | : Robert B. Thomas |
Publisher | : |
Total Pages | : 16 |
Release | : 1985 |
Genre | : River sediments |
ISBN | : |
Author | : Liqin Zuo |
Publisher | : CRC Press |
Total Pages | : 193 |
Release | : 2018-06-19 |
Genre | : Science |
ISBN | : 0429794029 |
The evolution and utilization of estuarine and coastal regions are greatly restricted by sediment problems. This thesis aims to better understand fine sediment transport under combined action of waves and currents, especially in the wave-current bottom boundary layer (BBL). Field observations, experimental data analysis, theoretical analysis and numerical models are employed. Silt-dominated sediments are sensitive to flow dynamics and the suspended sediment concentration (SSC) increase rapidly under strong flow dynamics. This research unveils several fundamental aspects of silty sediment, i.e., the criterion of the incipient motion, the SSC profiles and their phase-averaged parameterization in wave-dominated conditions. An expression for sediment incipient motion is proposed for silt-sand sediment under combined wave and current conditions. A process based intra-wave 1DV model for flow-sediment dynamics near the bed is developed in combined wave-current conditions. The high concentration layer (HCL) was simulated and sensitivity analysis was carried out by the 1DV model on factors that impact the SSC in the HCL. Finally, based on the 1DV model, the formulations of the mean SSC profile of silt-sand sediments in wave conditions were proposed. The developed approaches are expected to be applied in engineering practice and further simulation.
Author | : J. J. Williams |
Publisher | : |
Total Pages | : 6 |
Release | : 1999 |
Genre | : Suspended sediments |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 14 |
Release | : 2008 |
Genre | : |
ISBN | : |
A simple and robust suspended load transport formula for noncohesive sediment is presented for application to river, estuarine, and coastal environments with the use of depth-averaged models. The formula is based on an exponential profile for the concentration and assumes a constant velocity over depth to simplify the calculations. These assumptions were validated with a large data set, including data with a steady current, wave and current interaction, and breaking waves. The formula has two parameters: the mean sediment diffusivity over depth and the bottom reference concentration. The sediment diffusivity is estimated assuming a linear combination of mixing because of breaking waves and the energy dissipation in the bottom boundary layer from the mean current, waves, or both. The bottom reference concentration is a function of the Shields parameter. Overall, the formula developed in this study yields the best agreement with the compiled data set compared with a number of existing formulas for estimating the suspended load.
Author | : Dale M. Robertson |
Publisher | : |
Total Pages | : 48 |
Release | : 2006 |
Genre | : Suspended sediments |
ISBN | : |