Coastal Bottom Boundary Layers And Sediment Transport
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Coastal Bottom Boundary Layers And Sediment Transport
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Author : Peter Nielsen
language : en
Publisher: World Scientific
Release Date : 1992
Coastal Bottom Boundary Layers And Sediment Transport written by Peter Nielsen and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Science categories.
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.
Coastal Bottom Boundary Layers And Sediment Transport
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Author :
language : en
Publisher:
Release Date : 1992
Coastal Bottom Boundary Layers And Sediment Transport written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
A Short Manual Of Coastal Bottom Boundary Layers And Sediment Transport
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Author : P. Nielsen
language : en
Publisher:
Release Date : 1985
A Short Manual Of Coastal Bottom Boundary Layers And Sediment Transport written by P. Nielsen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Boundary layer categories.
Advanced Series On Ocean Engineering Volume 4 Coastal Bottom Boundary Layers And Sediment Transport
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Author : Peter Nielsen
language : en
Publisher:
Release Date : 1994
Advanced Series On Ocean Engineering Volume 4 Coastal Bottom Boundary Layers And Sediment Transport written by Peter Nielsen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Modelling And Analysis Of Fine Sediment Transport In Wave Current Bottom Boundary Layer
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Author : Liqin Zuo
language : en
Publisher: CRC Press
Release Date : 2018-06-19
Modelling And Analysis Of Fine Sediment Transport In Wave Current Bottom Boundary Layer written by Liqin Zuo and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-19 with Science categories.
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.
Mechanics Of Coastal Sediment Transport
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Author : J?rgen Freds?e
language : en
Publisher: World Scientific
Release Date : 1992
Mechanics Of Coastal Sediment Transport written by J?rgen Freds?e and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Science categories.
This book treats the subject of sediment transport in the marine environment, covering transport of non-cohesive sediment by waves and current in- and outside the surf zone. It can be read independently, but a background in hydraulics and basic wave mechanics is required. It is intended for M.Sc. and Ph.D. students. The primary aim of the book is to describe the physical processes of sediment transport and how to represent them in mathematical models. It does not present a large number of different formulae for the sediment transport rates under various conditions. The book can be divided in two main parts; in the first, the relevant hydrodynamic theory is described; in the second, sediment transport and morphological development are treated. The hydrodynamic part contains a review of elementary theory for water waves, chapters on the turbulent wave boundary layer and the turbulent interaction between waves and currents, and finally, surf zone hydrodynamics and wave driven currents. The part on sediment transport introduces the basic concepts (critical bed shear stress, bed load, suspended load and sheet layer, near-bed concentration, effect of sloping bed); it treats suspended sediment in waves and current and in the surf zone, and current and wave-generated bed forms. Finally, the modelling of cross-shore and long-shore sediment transport is described together with the development, of coastal profiles and coastlines.
Turbulence Resolving Numerical Investigations Of Coastal Bottom Boundary Layer And Fine Sediment Transport
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Author : Liangyi Yue
language : en
Publisher:
Release Date : 2023
Turbulence Resolving Numerical Investigations Of Coastal Bottom Boundary Layer And Fine Sediment Transport written by Liangyi Yue and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
The bottom boundary layer in coastal ocean is of intrinsic scientific importance in many disciplines, serving as the near-bed passage where many benthic transport processes occur and it is a vital bridge connecting the wave propagation, currents and upper ocean processes with the seafloor. The present work focuses on the fluid dynamics in coastal bottom boundary layer (CBBL) and the associated sediment transport process using the technique of turbulence-resolving numerical simulation (TRNS). Particularly, we are interested in the entrainment, suspension and transport of fine sediment in the wave bottom boundary layer (WBBL) driven by surface gravity waves.
Wave Boundary Layers And Their Relation To Sediment Transport
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Author : Paul G. Teleki
language : en
Publisher:
Release Date : 1972
Wave Boundary Layers And Their Relation To Sediment Transport written by Paul G. Teleki and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Boundary layer categories.
Evaluation Of Wave Current Bottom Boundary Layer Modelstitle
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Author : Claire S. Nichols
language : en
Publisher:
Release Date : 2005
Evaluation Of Wave Current Bottom Boundary Layer Modelstitle written by Claire S. Nichols and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Abstract: Widespread beach erosion is threatening coastal environments making coastal engineering, especially sediment transport, a rising field of interest. An improved understanding of sediment transport will help us to combat coastal threats such as beach erosion, harbor siltation, submerged object scour, and coastal structure failure. In coastal environments sediment is transported by both currents and waves. This environment is complicated because waves and currents interact in a way that does not allow for a linear sum of their separate behaviors. In this effort, the wave-current bottom boundary layer physics are examined with several applied engineering models and with a more sophisticated numerical model. The models are evaluated with the mean bed stress, a parameter used for the bottom dissipation calculations in circulation models, and the peak bed stress, a parameter used for quantifying sediment transport. The numerical model, Dune, used in these calculations is a quasi-three dimensional, non-hydrostatic numerical model. The model resolves the relevant dynamics of wave and current boundary layers over smooth and rough movable sand beds and includes models for the two modes of sediment transport, bed load and suspended load ((Fredsøe et al., 1999)). Model calculations were performed for 7 wave periods, 20 wave velocities, 10 current velocities, and 2 wave-current angles. The calculations were compared with three models currently used in engineering practice (Grant-Madsen (1994), Soulsby (1993), Styles- Glenn (2000)). Predictions of the mean and peak bed stress by Dune and the three wave-current boundary layer models are generally of comparable magnitude. However, predictions of the mean bed stress by all three engineering models diverge from Dune when the wave velocity is greater than the current velocity. An obliquely approaching current does not have a significant effect on the peak bed stress, but does affect the mean bed stress under large wave forcing. Predictions of the peak bed stress by the Grant-Madsen, and Styles-Glenn models are consistent with the Dune simulations at large wave periods, but are larger than the Dune simulations for the smaller wave periods, indicating a greater sensitivity to inertial effects produced by the waves. These results show that there exists model divergence when the unsteady wave forcing is larger than the mean forcing. This summer the models will be evaluated with field observations obtained in a large-scale wave flume.
Modelling Sheet Flow Sediment Transport In Wave Bottom Boundary Layers Using Discrete Element Modelling
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Author :
language : en
Publisher:
Release Date : 2004
Modelling Sheet Flow Sediment Transport In Wave Bottom Boundary Layers Using Discrete Element Modelling written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Sediment transport in oscillatory boundary layers is a driving mechanism of coastal geomorphologic change. Most formulae for bed-load transport in near-shore regions subsume the smallest-scale physics of the phenomena by parameterizing interactions between particles. In contrast, the authors directly simulate granular physics in the wave-bottom boundary layer using a discrete-element model consisting of a three-dimensional particle phase coupled to a one-dimensional fluid phase via Newton's Third Law through forces of buoyancy, drag, and added mass. The particulate sediment phase is modeled using discrete, non-spherical particles formed to approximate natural grains by overlapping two spheres. Both the size of each sphere and the degree of overlap can be varied for these composite particles to generate a range of non-spherical grains. Simulations of particles having a range of shapes showed that the critical angle - the angle at which a grain pile will fail when tilted slowly from rest - increases from approximately 26 degrees for spherical particles to nearly 39 degrees for highly non-spherical composite particles having a dumbbell shape. Simulations of oscillatory sheet flow were conducted using composite particles with an angle of repose of approximately 33 degrees and a Corey shape factor greater than about 0.8, similar to the properties of beach sand. The results from the sheet-flow simulations with composite particles agreed more closely with laboratory measurements than similar simulations conducted using spherical particles. The findings suggest that particle shape may be an important factor for determining bed-load flux, particularly for larger bed slopes. (5 figures, 18 refs.).