Ray Wilton (UWB) provided invaluable technical support. Our thanks go also to the crew of the RV Prince Madog for their assistance in making the measurements reported here. Dr. Jonathan Sharples (SOC) is thanked for the loan of the ADCP. Tom Rippeth is in receipt of the Natural Environmental Research Council Research Fellowship. The data collection and analysis were supported by the EU MAST III PROVESS project (Contract MAS3-CT97-0159) and Natural Environment Research Council Grant GR3/11829. We would also like to thank two anonymous reviewers for raising a number of useful suggestions, which led to the improvement of this paper.
Bowden, K. F., , and L. A. Fairburn, 1952: A determination of the frictional forces in a tidal current. Proc. Roy. Soc. London, A214 , 371–392.
Dewey, R. K., , W. R. Crawford, , A. E. Gargett, , and N. S. Oakey, 1987:: A microstructure instrument for profiling oceanic turbulence in coastal bottom boundary layers. J. Atmos. Oceanic Technol, 4 , 288–297.
Inall, M. E., , T. P. Rippeth, , and T. J. Sherwin, 2000: The impact of non-linear waves on the dissipation of internal tidal energy at the shelf break. J. Geophys. Res, 105 , (C4). 8687–8705.
Jay, D. A., , and J. D. Smith, 1990: Circulation, density structure and neap-spring transitions in the Columbia River Estuary. Progress in Oceanography, Vol. 25, Pergamon P, 81–112.
Monismith, S. G., , J. R. Burau, , and M. T. Stacey, 1996: Stratification dynamics and gravitational circulation in northern San Francisco Bay. San Francisco Bay, the Ecosystem, T. Hollibaugh Ed., Pacific Division, Amer. Assoc. Adv. Sci., 123–153.
Nepf, H. M., , and W. R. Geyer, 1996: Intratidal variations in stratification and mixing in the Hudson estuary. J. Geophys. Res, 101 , 12 079–12 086.
Nunes, R. A., , and G. Lennon, 1987: Episodic stratification and gravity currents in a marine environment of modulated turbulence. J. Geophys. Res, 92 , 5465–5480.
Nunes, R. A., , G. W. Lennon, , and J. R. de Silva Samarasinghe, 1989: The negative role of turbulence in estuarine mass transport. Estuarine, Coastal Shelf Sci, 28 , 361–377.
Peters, H., 1997: Observations of stratified turbulent mixing in an estuary. Neap-to-spring variations during high river run-off. Estuarine Coastal Shelf Sci, 45 , 69–88.
Peters, H., , and R. Bokhorst, 2000: Microstructure observations of turbulent mixing in a partially mixed estuary. Part I: Dissipation rate. J. Phys. Oceanogr, 30 , 1232–1244.
Sharples, J., , and J. H. Simpson, 1995: Semi-diurnal and longer period stability cycles in the Liverpool Bay region of freshwater influence. Contin. Shelf Res, 15 , 295–313.
Sharples, J., , J. H. Simpson, , and J. Brubacker, 1994: Observations and modelling of periodic stratification in the upper York River estuary. Virginia. Estuarine Coastal Shelf Sci, 38 , 301–312.
Simpson, J. H., , J. Brown, , J. Matthews, , and G. Allen, 1990: Tidal straining, density currents, and stirring in the control of estuarine stratification. Estuaries, 13 , 125–132.
Simpson, J. H., , W. R. Crawford, , T. P. Rippeth, , A. R. Campbell, , and J. V. S. Cheok, 1996: The vertical structure of turbulent dissipation in shelf seas. J. Phys Oceanogr, 26 , 1579–1590.
Simpson, J. H., , T. P. Rippeth, , and A. R. Campbell, 2000: The phase lag of turbulent dissipation in tidal flow. Interactions between Estuaries, Coastal Seas and Shelf Seas, T. Yanagi, Ed., Terra Scientific, 57–67.
Stacey, M. T., , S. G. Monismith, , and J. R. Burau, 1999: Observations of turbulence in a partially stratified estuary. J. Phys. Oceanogr, 29 , 1950–1970.