Mechanics of Coastal Sediment Transport

Mechanics of Coastal Sediment Transport PDF

Author: J?rgen Freds?e

Publisher: World Scientific

Published: 1992

Total Pages: 406

ISBN-13: 9789810208400

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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.

Nearshore Sediment Transport

Nearshore Sediment Transport PDF

Author: R.J. Seymour

Publisher: Springer Science & Business Media

Published: 2013-11-11

Total Pages: 410

ISBN-13: 1489925317

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This book represents the efforts of over a hundred individuals who planned and executed the NSTS field experiments, analyzed the billions of data points, and distilled their findings and insights into the summaries found here. Because these experiments were of a scope that will seldom, if ever, be duplicated, and because the program brought together many of the foremost field experimentalists in this country, we all felt from the beginning that it was important to preserve the outcome. This was done in two ways. First, the raw data were made available to any interested investigator within 18 months of the completion of each experiment. Secondly, both the methodology of the experiments and the findings from them were codified in the form of a monograph. This book is that result. I have had the occasion recently (Sediments '87 Proceedings, Vol. 1, pp. 642-651) to assess the NSTS performance. I found that we made giant strides in our understanding of the surf zone hydrodynamics --far more than our fondest expectations at the beginning. We were able to do less than we had hoped about the response of the sediment, largely because of a limited ability to measure it at a point. As I reported in the Sediments '87 assessment, we established a new state of the art in measurement techniques and we demonstrated the effectiveness of large, multi-investigator, instrument-intensive experiments for studying nearshore processes.

Mechanics of Coastal Sediment Transport

Mechanics of Coastal Sediment Transport PDF

Author: Jørgen Fredsøe

Publisher: Springer Science & Business

Published: 1992

Total Pages: 396

ISBN-13: 9789810208417

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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. The primary aim of the book is to describe the physical processes of sediment transport and how to represent them in mathematical models.

Coastal Bottom Boundary Layers And Sediment Transport

Coastal Bottom Boundary Layers And Sediment Transport PDF

Author: Peter Nielsen

Publisher: World Scientific Publishing Company

Published: 1992-07-21

Total Pages: 340

ISBN-13: 9813103582

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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.

Sediment Transport in Coastal Waters

Sediment Transport in Coastal Waters PDF

Author: Sylvain Ouillon

Publisher: MDPI

Published: 2019-04-11

Total Pages: 284

ISBN-13: 3038978442

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The interface of 440,000 km long coastline in the world is subject to global change, with an increasing human pressure (land use, buildings, sand mining, dredging) and increasing population. Improving our knowledge on involved mechanisms and sediment transport processes, monitoring the evolution of sedimentary stocks and anticipating changes in littoral and coastal zones is essential for this purpose. The special issue of Water on “Sediment transport in coastal waters” gathers thirteen papers which introduce the current revolution in the scientific research related to coastal and littoral hydrosedimentary dynamics, and reflect the diversity of concerns on which research in coastal sediment transport is based, and current trends — topics and preferred methods — to address them.

Sediment Transport Processes in the Nearshore Waters Adjacent to Galveston Island and Bolivar Peninsula

Sediment Transport Processes in the Nearshore Waters Adjacent to Galveston Island and Bolivar Peninsula PDF

Author: Gary Lynn Hall

Publisher:

Published: 1976

Total Pages: 666

ISBN-13:

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The net longshore transport of sand along Bolivar Peninsula and Galveston Island during 1975 was toward the southwest at rates that varied from 1.52 x 10 5 yds3/yr at Sea Isle on Galveston Island to 5.4 x 10 4 yds3/yr at Gilchrist on Bolivar Peninsula. Net longshore transport was toward the southwest during months of fall, winter and spring and generally toward the northeast only during three months of summer. An excellent correlation exists between the longshore transport direction and several factors including the frequency of the observed wave approach, speed and direction of the longshore current and the wind direction and velocity. Fluorescent sediment tracer studies revealed that a significant portion of the longshore transport showed a tendency to move parallel to the shoreline or offshore toward the breaker zone under most surf conditions. The seaward transport of sand in the surf zone was characteristically along paths nearly parallel to the angle of wave approach until reaching the breaker zone. Transport parallel to the shore at a significant distance shoreward of the primary breaker zone was usually attributed to entrainment in moderate- to high-velocity longshore currents, transport on the crests of bars or channelized flow in the runnels. Sediment tracer analyses conducted along the north and south jetties revealed that transport along these structures was controlled primarily by wind direction, wave action and the strength and direction of the prevailing tidal currents. Strong northerly winds create intense wave action which vigorously churns the sediments and batters the north jetty. Enhanced ebb-tidal currents transport the sandy sediments seaward along the jetty, through the small boat passage into the outer bar channel and ultimately around the seaward extremity of the jetty.

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