Sand Bed Friction Factors for Oscillatory Flows PDF Download
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Author: Philip Vitale
Publisher:
ISBN:
Category : Frictional resistance (Hydrodynamics).
Languages : en
Pages : 20
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Book Description
Author: Philip Vitale
Publisher:
ISBN:
Category : Frictional resistance (Hydrodynamics).
Languages : en
Pages : 20
Get Book Here
Book Description
Author: Philip Vitale
Publisher:
ISBN:
Category : Frictional resistance (Hydrodynamics)
Languages : en
Pages : 0
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Book Description
Author: Palitha Nalin Wikramanayake
Publisher:
ISBN:
Category : Continental shelf
Languages : en
Pages : 158
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Book Description
Author: Marion Robert Carstens
Publisher:
ISBN:
Category : Sand
Languages : en
Pages : 114
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Book Description
Author: Abu Mohammad Zahirul Alam
Publisher:
ISBN:
Category :
Languages : en
Pages : 196
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Book Description
Author: Karl E. B. Lofquist
Publisher:
ISBN:
Category : Frictional resistance (Hydrodynamics)
Languages : en
Pages : 184
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Book Description
Laboratory tests measure the time-dependent drag on naturally rippled sand beds under oscillatory flows. The time integral of the product of this drag and the oscillatory flow velocity provide the energy dissipated per period. A positive kesplacement oscillatory flow tunnel provides amplitudes and periods of flow over a wide range of prototype conditions. With the test section split longitudinally into two channels, one containing the sand bed and the other having a smooth metallic bottom, the drag on the bed is obtained from the measured difference between pressure gradients in the two channels. Two sands are used, with diameters 0.55 and 0.18 mm. The experimental profiles are mostly natural and mature, but some are deliberately distorted. The experimental profiles are in process of growth from a bed initially flat. Bottom stress, including skin friction and profile drag components, is found to be a fairly complicated function of the phase and not proportional to the square of the simultaneous sinusoidal velocity far above the bed. Average values of the bottom stress and rates of energy dissipation are both typically an order of magnitude greater than for a flat surface roughened with fixed grains. Amplitudes and shapes of the curves of stress coefficient as function of phase are interpreted in terms of physical mechanisms and simple models--the profile drag as produced by flow separation at the crest with the growth of an attached vortex in its lee and the skin friction as produced by the flow, modified by a detached vortex, up the ripple face.
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 968
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Book Description
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 696
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Book Description
Author: Robert J. Hallermeier
Publisher:
ISBN:
Category : Beach erosion
Languages : en
Pages : 54
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Book Description
Author: Peter Nielsen
Publisher: World Scientific
ISBN: 9789810204730
Category : Science
Languages : en
Pages : 356
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Book Description
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.
