T&T: Hudson tides

[LRZeitlin@aol.com]

In a message dated 4/2/07 12:57:27 PM, ague@usa.net writes:


> > The tidal current in the more constricted portions of the river can reach
> > almost 3 knots. The speed of the ebb and flow currents are so nearly
> > matched that
> > it would take a bottle dropped in the river at Albany nearly half a year
> > to
> > reach New York City, 150 miles downstream.
> 
> Applying some physics roughly, wouldn't that suggest that the non-tidal
> portion of the Hudson River current is about 1 nm/d(150nm/180d)? Or 0.04
> kts? That doesn't sound right.
> 
> 

Strangely enough, Jim, that's about right. At least for mid-summer 
conditions. The Hudson is tidal all the way to Albany and the water is fairly salt for 
at least 75 miles upstream. During the spring when the snow melts, there is a 
good discharge of fresh water from river tributaries. But in the middle of a 
dry summer there is hardly any discharge at all. I've seen the same floating 
tree branches drift back and forth in front of my mooring for several tides.

Larry Z


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