Turbulence Measurements in the Stratified Central North Sea with a Laser-Doppler Velocimeter System

The North Sea between the Dutch coast and the Dogger bank shows a seasonal stratification during the period from May to September. In 1981 a series of three field experiments were carried out to investigate the evolution of the stratification in this area (54°30′N,4°30′E). A number of measurements were done from moorings with self-registrating instruments and from a ship. A horizontal array of current meters determined horizontal motions of water masses, a vertical array in combination with a thermistor chain and a C.T.D.-sensor determined the velocity shear and the density structure of the water column. A laser-doppler velocimeter system was used to measure the small-scale velocity fluctuations at several heights. Additional meteorological observations were carried out.

[1]  R. Soulsby,et al.  The form of the near-bed velocity profile in a tidally accelerating flow , 1981 .

[2]  G. Kullenberg.  ENTRAINMENT VELOCITY IN NATURAL STRATIFIED VERTICAL SHEAR FLOW. , 1977 .

[3]  John L. Lumley,et al.  The laser-Doppler velocimeter and its application to the measurement of turbulence , 1973, Journal of Fluid Mechanics.

[4]  K. Dyer,et al.  Current Velocity Profiles in a Tidal Channel , 1971 .

[5]  E. Kraus.  Modelling and prediction of the upper layers of the ocean , 1977 .

[6]  R. Sternberg.  Friction factors in tidal channels with differing bed roughness , 1968 .

[7]  Norden E. Huang,et al.  On surface drift currents in the ocean , 1979, Journal of Fluid Mechanics.

[8]  C. Vincent,et al.  Observations of shear in near-bed currents in the southern North Sea , 1977 .

[9]  K. F. Bowden,et al.  Variations with Height of The Turbulence in a Tidally-Induced Bottom Boundary Layer , 1980 .

[10]  H. Charnock.  Tidal Friction from Currents near the Seabed , 1959 .

[11]  A Laser-Doppler Velocimeter for Small Scale Turbulence Studies in the Sea , 1980 .

[12]  A. D. Heathershaw,et al.  The turbulent structure of the bottom boundary layer in a tidal current , 1979 .

[13]  Robert H. Kraichnan,et al.  Isotropic Turbulence and Inertial-Range Structure , 1966 .

[14]  J. Lumley,et al.  A First Course in Turbulence , 1972 .

[15]  A. Melling,et al.  Principles and practice of laser-Doppler anemometry , 1976 .

[16]  H. L. Grant,et al.  Turbulence spectra from a tidal channel , 1962, Journal of Fluid Mechanics.

[17]  Tariq S. Durrani,et al.  Laser Systems in Flow Measurement , 1977 .

[18]  R. W. Stewart,et al.  Measurements of the Turbulent Fluxes of Momentum, Moisture and Sensible Heat Over the Ocean, , 1971 .