Field Investigation of the Spatial and Temporal Structure of Longshore Currents PDF Download
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Author: Guy Allen Meadows
Publisher:
ISBN:
Category : Michigan, Lake
Languages : en
Pages : 336
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Book Description
Author: Guy Allen Meadows
Publisher:
ISBN:
Category : Michigan, Lake
Languages : en
Pages : 336
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Book Description
Author: Guy Allen Meadows
Publisher:
ISBN:
Category : Littoral drift
Languages : en
Pages : 200
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Book Description
This field investigation was conducted to obtain simultaneous and continuous measurements of the horizontal, vertical and temporal variability of the longshore current flow field. The present study has resulted in a two-dimensional mapping, across the surf zone and with depth, of the longshore current field. The vertical structure of the mean longshore current flow field is nearly uniform with depth, with a narrow bottom boundary layer and sharp velocity gradients at the water-sediment interface. This investigation has also shown that the total longshore current velocity vector, at any point across the surf zone, is composed of three distinct velocity components. These components are: (1) a steady longshore current velocity component; (2) a long-period fluctuating velocity component which tends to be out-of-phase with the incident wave field and; (3) a short-period fluctuating longshore current velocity component which tends to be in-phase with the incident wave field. The results of this study have further indicated that neither the deterministic radiation stress approach to the prediction of longshore currents, nor a probabilistic formulation, provide adequate prediction of the magnitude or distribution of the longshore current velocity across the surf zone. In addition, the existence of a low velocity zone in the longshore current flow field has been isolated over the submarine bar. It appears that existing analytical formulations for longshore current flow prediction must be re-evaluated in light of the findings of this study. (Author).
Author: Coastal Engineering Research Center (U.S.)
Publisher:
ISBN:
Category : Coasts
Languages : en
Pages : 754
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Author: Coastal Engineering Research Center (U.S.)
Publisher:
ISBN:
Category : Coasts
Languages : en
Pages : 508
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836
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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:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 368
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Author: Pauline H. Gurewitz
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 384
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Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Hydraulic engineering
Languages : en
Pages : 384
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Author:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 520
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