Using data from the Coastal Ocean Dynamics Experiment ( CODE ) and the Island Coastal Current Experiment, the internal ride offthe west coast ofthe Vancouver Island was studied. Although the semidiurnal barotropic velocity field in the area was weak, the baroclinic field was found to be relatively strong with speeds
up to five
times greater.
The intermittent nature of the baroclinic field was resolved
by estimating
the M2 tidal harmonic
coefficients
every 24 hours in l5-day overlaping
intervals. These time-evolving
coefficients
were then analyzed
using spectral
analysis
methods.
For most ofthe area under investigation,
the internal tide was generated
mainly
at the shelf break and was found to propagate
cross-shore.
Off Estevan point, where the bottom contour is
regular, the beam structure was identified and traced to distances
40 km from the generation region on the
slope. The downward-propagating
beam was found to follow the seasonal
variation ofthe characteristic
prop-
agation paths. An empirical orthogonal function analysis
revealed
a highly coherent baroclinic field (787o of the M2 variance). The predictions of an internal tide model were found to be in good agreement
with the
experimental
results on the slope. The interaction of a cyclonic eddy, present in the area during August 1980,
with the internal tide was also addresse.