on 2013-10-03 15:40 Larry Colen wrote
I wonder what the elevation of the river is 140 miles upstream.
"mean elevation of Hudson River at Albany is 2 feet above sea level" (per a
USGS site via google cache due to government shutdown)
High tides much over, what?, a meter?, are probably a bit unusual,
and tidal effects are probably mostly limited by the elevation
of the river surface, and the high tide level.
high tides are usually measured at coasts, where topography can make a huge
difference; if the earth were just a ball of water, tides would be less than a
meter in range:
<http://en.wikipedia.org/wiki/Tide#Amplitude_and_cycle_time>
my personal experience of tides is mostly 2-3 meters, except for the Bay of
Fundy, where i've seen 7-meter tides (modest for the area)
as they are waves interacting with coastlines and river channels, how tides
create currents is not based solely on increase in water level
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