I agree with tecoyah. Tidal wave is logically wrong if the tide has nothing to do with the wave.
However, there are types of tidal waves (bores) which can be seen rolling upriver with the funneled, fast rising tide in some places (the river Severn bore is the nearest definite example i can think of). In these cases "tidal wave" would be accurate. Unfortunately there's a smaller and easier to pronounce word for it - "bore" - so i've rarely heard it referred to as a tidal wave.
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