World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Effect of Variable Winds on Current Structure and Reynolds Stresses in a Tidal Flow: Analysis of Experimental Data in the Eastern English Channel : Volume 9, Issue 3 (13/06/2012)

By Korotenko, K. A.

Click here to view

Book Id: WPLBN0003980687
Format Type: PDF Article :
File Size: Pages 40
Reproduction Date: 2015

Title: Effect of Variable Winds on Current Structure and Reynolds Stresses in a Tidal Flow: Analysis of Experimental Data in the Eastern English Channel : Volume 9, Issue 3 (13/06/2012)  
Author: Korotenko, K. A.
Volume: Vol. 9, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Sentchev, A. V., Schmitt, F. G., & Korotenko, K. A. (2012). Effect of Variable Winds on Current Structure and Reynolds Stresses in a Tidal Flow: Analysis of Experimental Data in the Eastern English Channel : Volume 9, Issue 3 (13/06/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Laboratoire d'Océanologie et de Géosciences, UMR8187, CNRS, Université du Littoral Côte d'Opale, Wimereux, France. Wind and wave effects on tidal current structure and turbulence throughout the water column are examined using an upward-looking acoustic Doppler current profiler (ADCP). The instrument has been deployed on the seafloor of 20-m depth, off the North-Eastern French coast in the Eastern English Channel over 12 tidal cycles and covered the period of the transition from mean spring to neap tide and forcing regimes varied from calm to moderate storm conditions. During storms, we observed gusty winds with magnitude reached 15 m s−1 and wave height reached up to 1.3 m. Analysis of velocity spectra revealed a noticeable contribution of wind-induced waves to spectral structure of velocity fluctuations within the upper 10-m layer. Near the surface, stormy winds and waves produced a significant intensification of velocity fluctuations, particularly when the sustained wind blew against the ebb tide flow. As during wavy periods the variance-derived Reynolds stress estimates might include a wave-induced contamination, we applied the Variance Fit method to obtain unbiased stresses and other turbulent quantities. Over calm periods, the turbulent quantities usually decreased with height above the seabed. The stresses were found to vary regularly with the predominantly semidiurnal tidal flow, with the along-shore stress being generally greater during the flood flow (~2.7 Pa) than during the ebb flow (~−0.6 Pa). The turbulent kinetic energy production rate, P, and eddy viscosity, Az}, followed a nearly regular cycle with close to a quarter-diurnal period. As for the stresses, near the seabed, we found the maximum values of estimated quantities of P and Az to be 0.1 W m−3 and 0.5 m2 s−1, respectively, during the flood flow. Over the storm periods, we found the highest stress values (~−2 Pa) during ebb when tidal currents were opposite to the southwesterly winds while, during the flood, the surface stresses slightly exceeded those estimated for a calm period.

Summary
Effect of variable winds on current structure and Reynolds stresses in a tidal flow: analysis of experimental data in the Eastern English Channel

Excerpt
Brylinski, J. M., Brunet, C., Bentley, D., Thoumelin, G., and Hilde, D.: Hydrography and phytoplankton biomass in the Eastern English Channel in spring 1992, Estuar. Coast. Shelf Sci., 43, 507–519, 1996.; Fredersen, F. and Williams III, A. J.: Direct estimation of the Reynolds stress vertical structure in the nearshore, J. Atmos. Ocean. Tech., 24, 102–116, 2007.; Fugate, D. C. and Chant, R. J.: Near-bottom shear stresses in a small, highly stratified estuary, J. Geophys. Res., 110, C03022, doi:10.1029/2004JC002563, 2005.; Huang, Y. X., Schmitt, F. G., Lu, Z. M., Fougairolles, P., Gagne, Y., and Liu, Y. L.: Second order structure functions in fully developed turbulence, Phys. Rev. E, 82, 026319, doi:10.1103/PhysRevE.82.026319, 2010.; Kirincich, A. R., Lentz, S. J., and Gerbi, G. P.: Calculating Reynolds Stresses from ADCP measurements in the presence of surface gravity waves using the cospectra-fit method, J. Atmos. Ocean. Tech., 27, 889–907, 2010.; Korotenko, K. A. and Sentchev, A. V.: On the formation of anomalies in the ichthyoplankton concentration field along the French coast in the Eastern English Channel, Oceanology, 44, 644–653, 2004.; Korotenko, K. A. and Sentchev, A. V.: Effects of the particle migration on the features of their transport by tidal currents in the region of freshwater influence, Oceanology, 48, 672–684, 2008.; Korotenko, K. A. and Sentchev, A. V.: Study turbulence in shallow tidal coastal zone, Oceanology, 51, 1–14, 2011.; Lohrmann, A., Hackett, B., and Roed, L. P.: High resolution measurements of turbulence, velocity, and stress using a pulse-to-pulse coherent sonar, J. Atmos. Ocean. Tech., 7, 19–37, 1990.; Lu, Y. and Lueck, R. G.: Using a broadband ADCP in a tidal channel. Part I: mean flow and shear, J. Atmos. Ocean. Tech., 16, 1556–1567, 1999a.; Lu, Y. and Lueck, R. G.: Using a broadband ADCP in a tidal channel. Part II: mean flow and shear, J. Atmos. Ocean. Techn., 16, 1568–1579, 1999b.; Nidzieko, N. J., Fong, D. A., and Hench, J. L.: Comparison of Reynolds stress estimates derived from standard and fastping ADCPs, J. Atmos. Ocean. Tech., 23, 854–861, 2006.; Peters, H.: Observations of stratified turbulent mixing in an estuary. Neap-to-spring variations during high river run-off, Estuar. Coast. Shelf Sci., 45, 69–88, 1997.; Peters, H. and Johns, W. E.: Bottom layer turbulence in the Red Sea outflow plume, J. Phys. Oceanogr., 36, 1763–1785, 2006.; Peters, H., Lee, C. M., Orlic, M., and Dorman, C. E.: Turbulence in the wintertime Northern Adriatic Sea under strong atmospheric forcing, J. Geophys. Res., 112, C03S09, doi:10.1029/2006JC003634, 2007.; Plueddemann, A. J., Smith, J. A., Farmer, D. M., Weller, R. A., Crowford, W. R., Pinkel, R., Vagle, S., and Gnanadesikan, A.: Structure and variability of Langmuir Circulation during the Surface Waves Processes Program, J. Geophys. Res., 101, 3525–3543, 1996.; Rascle, N., Ardhuin, F., Queffeulou, P., and Croizé-Fillon, D.: A global wave parameter database fo

 

Click To View

Additional Books


  • Impact of Variable Sea-water Conductivit... (by )
  • The Role of Atmosphere and Ocean Physica... (by )
  • The Instability of Diffusive Convection ... (by )
  • Phytoplankton Blooms on the Western Shel... (by )
  • Deep Currents in the Gulf of Guinea: Alo... (by )
  • Fine-scale Features on the Sea Surface i... (by )
  • Correlation Between Subsurface High-sali... (by )
  • Sea Level Trend and Variability Around t... (by )
  • Image of a Subsurface Current Core in th... (by )
  • Operational Forecast of Hydrophysical Fi... (by )
  • The Improvements of the Ships of Opportu... (by )
  • Comparing Historical and Modern Methods ... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.