Abstract
A numerical model study of the tidal regime west of Vancouver Island is presented. Ale model employed is a nonlinear barotropic two-dimensional tidal model incorporating realistic bathymetry. The M2 and K1 constituents are examined and comprehensive comparisons between computed and observed elevations and currents are given.
For M2, the model reproduces observed motion very accurately. However, K1 is of greater interest since it contains a substantial contribution in the form of a continental shelf wave (CSW). The model correctly predicts the existence of the CSW but, consistent with the neglect of stratification and the influence of mean flows, underestimates its wavelength. It is shown that the CSW component of K1 is generated by the tidal flow in Juan de Fuca Strait.
The influence of mean currents on the tidal regime is investigated by including them in a further model solution. Consistent with theory, the wavelength of the CSW component of K1 is increased, giving improved agreement with observations.
