If we're splitting hairs, the correct term for what I'm describing is indeed tsunami (rough translation - "harbor wave").  However, the correct term for what you describe is not a tidal wave, but a tidal bore.  I've experienced them in two places I've lived, Maine (Bay of Fundy) and Alaska (Turnagain Arm in Cook Inlet).  

Tidal wave is a catch-all phrase used to most commonly describe a tsunami when it reaches landfall.  And although you're right, energy is dispersed and not collected as a tsunami nears landfall, tsunamis give the appearance of energy collection due to the shallowing of the water depth.  Hence the reason surfing is much more popular on the west coast than on the east, as the sea floor comes-up much more gradually on the west coast.  Thus, the waves are bigger

Dennis Plante

Jordan 

>From: Tim Bonham <[EMAIL PROTECTED]>
>To: mpls-issues <[EMAIL PROTECTED]>
>Subject: [Mpls] Re: 3rd Ward Primary - tidal waves
>Date: Tue, 31 Dec 2002 22:59:22 -0600
>
>Sorry, Dennis, but I believe you're thinking of a tsunami wave.
>Tidal waves are caused, oddly enough, by tides! And it doesn't
>gain energy as it travels -- it loses energy. But the remaining
>energy is compressed by shallower water and narrower harbor or river
>mouth openings, and thus forms a higher wave at landfall.
>
>I hope your candidate's knowledge of the ward is more accurate than
>your knowledge of oceanography.
>
>Tim Bonham, Ward 12, Standish-Ericsson
>
>>A good analogy would be a small seismic tremor out in the middle of
>>the ocean hardly causes a ripple in the water - at first. On its
>>travels towards landfall the small ripple gains energy and
>>momentum. Upon arrival at landfall, the small ripple becomes a
>>tidal wave.
>>. . .
>>Dennis Plante


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