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Abstract
The propagation of tides in the Fraser River is discussed, with particular attention to the nonlinear interactions that characterize tides in such a system. The tidal regime is reviewed, and then the distortion of the tidal wave as it propagates upstream is discussed. The seasonal variation in tidal constituents can be related to the seasonally varying magnitude of the Fraser River discharge. The distortion in the tidal wave is related to the production of overtides through the nonlinear advective and friction terms. By considering the astronomical constituents of the tide, expressions are derived for the production of such overtides as the M4 and are quantitatively related to the relative magnitudes of tidal and mean velocity contributions.