Tides

[pootleflump]

During a high tide, is water flowing uphill?

[wildwood]

No.

[mibn2cweus]

At high tide it's already reached its peak.

[Clanad]

Actually, in a sense, it is. If you're question means "during" a high tide... that is,as it is occurring, then one could imagine a shallow plate nearly full of water. A turkey baster could be used to suck some of the water out and then replace that nearly exact volume back into the plate. During that replacement, the water level rises from the bottom up (of course) which does mean that it's flowing up the sloping side. Thing is, during the tide's progress from high to low to high, the sea level is being affected by the gravitational attraction between the earth, the sun, and the moon and the centrifugal force due to the relative motions of the moon around the earth, and the earth around the sun. The total gravitational orces on the opposite sides of the Earth causes the the tides and when the phenomena reverses wter flowsback into the basin to re-achieve mean sea level. One standing near the high tide line will certainly perceive the water flowing up the beach or Continental Shelf...