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Author: Choule J. Sonu
Publisher:
ISBN:
Category : Wave-motion, Theory of
Languages : en
Pages : 152
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For the purpose of aiding in the strategic planning of naval inshore warfare operations, a study has been performed to develop prediction technology for shallow water waves, breakers, and longshore current velocities, using the visually observed deep water wave statistics as input. Computer programs, code-named 'BREAKM' and 'STATBR, ' and various nomographs have been developed to permit predictions for both physical magnitude and long-term statistics. Information display formats have been developed with a view to permitting speedy review of various key physical parameters and comparison between adjacent regions. Predicted results compare reasonably well with visually observed nearshore data, provided that a tolerable amount of discrepancy exists due partly to local conditions not accounted for in our prediction, partly to the built-in safety margin in our prediction, and partly to the limitations inherent to the state of the art. (Author).
Author: Coastal Engineering Research Center (U.S.)
Publisher:
ISBN:
Category : Coasts
Languages : en
Pages : 754
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 994
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Author:
Publisher:
ISBN:
Category : Coastal engineering
Languages : en
Pages : 102
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Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 566
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Author: Coastal Engineering Research Center (U.S.)
Publisher:
ISBN:
Category : Coasts
Languages : en
Pages : 508
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Author: Carlos Severino Veitia Garcia
Publisher:
ISBN:
Category : Ocean waves
Languages : en
Pages : 122
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An analytical formulation of the bed shear stress coefficient inside the surf zone is derived using the concept of radiation stress. A truncated Rayleigh p.d.f. is used to describe the wave field inside the surf zone and provides the input to calculate the variation of wave energy and longshore current as a function of wave height, water depth and distance to shore. The wave set-up is approximated using a sinusoidal wave solution. Field measurements of longshore current and waves within the surf zone are used to calculate the bed shear stress coefficient. Frequency distributions and statistics are calculated for the bed shear stress coefficient.
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 758
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Author: Choule J. Sonu
Publisher:
ISBN:
Category : Wave-motion, Theory of
Languages : en
Pages : 152
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Book Description
For the purpose of aiding in the strategic planning of naval inshore warfare operations, a study has been performed to develop prediction technology for shallow water waves, breakers, and longshore current velocities, using the visually observed deep water wave statistics as input. Computer programs, code-named 'BREAKM' and 'STATBR, ' and various nomographs have been developed to permit predictions for both physical magnitude and long-term statistics. Information display formats have been developed with a view to permitting speedy review of various key physical parameters and comparison between adjacent regions. Predicted results compare reasonably well with visually observed nearshore data, provided that a tolerable amount of discrepancy exists due partly to local conditions not accounted for in our prediction, partly to the built-in safety margin in our prediction, and partly to the limitations inherent to the state of the art. (Author).
Author: Dennis James Whitford
Publisher:
ISBN:
Category : Banks (Oceanography)
Languages : en
Pages : 238
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Book Description
Previous investigations of longshore currents have included simplifying assumptions and restriction (such as a planar beach, a steady and depth uniform flow, spatially-variant bed shear stress and turbulent momentum exchange, and the exclusion of surface wind stress. These assumptions are quantitatively investigated by calculating the relative importance of each term in the longshore momentum balance with an emphasis on the relative importance of wind forcing across the barred nearshore. Wind and wave forcing of longshore currents across a barred beach are examined using both a numerical model and field measurements. A local momentum balance was measured at various locations across the surf zone during the SUPERDUCK experiment held at the USACE CERC Field Research Facility, Duck, N.C. in October 1986. A moveable sled was instrumented with pressure, current, and wind sensors to measure the various terms in the longshore momentum equation. Stability-dependent atmospheric drag coefficients for the surf zone are determined from wind stress measurements acquired just beyond the surf zone and wind speed measurements acquired from an anemometer atop the 9 m sled mast. Breaking waves were visually identified and electronically marked on the data tapes. Keywords: Ocean currents; Air water interactions; Nearshore surf zone; Wind stress; Theses. (EDC).
Author: David R. Basco
Publisher:
ISBN:
Category : Coastal engineering
Languages : en
Pages : 104
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