Current structure in the Rhine region of freshwater influence
A.J. SOUZA, J.H. SIMPSON, F. SCHIRMER
Journal of Marine Research, Vol 55, pp. 277...292, 1997.
Abstract - -
Observation with HF radar, ADCPs and conventional current meters in the Rhine
ROFI system in the North Sea indicate that the dominant currents are due to
tidal flow, with important contributions from winds and density-driven
circulation. The tidal currents are dominated by the semidiurnal components,
principally the M2, with tidal ellipses parallel to the coast and a semimajor
axis of the order of 1 m s-1 at the surface.
The wind-driven flow varies
between 1 and 3 % of the wind speed and the rotation varies with depth in
qualitative agreement with Ekman theory. After removal of the tidal and
wind-driven component the residual flow within this region is generally
parallel to the coast (northwestward) with average surface speeds of about
10 cm s-1.
A convergence zone in the surface flow was observed at the outer
edge of the coastal zone. The vertical distribution of the residual velocity
closely follows Heaps (1972) profile for density-driven flow, with slight
deviations probably due to the tidal rectification (~2 cm s-1).
last update: Wednesday, 25-Nov-2015 15:30:55 CET