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post #13 of Old 12-23-2011
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Originally Posted by davidpm View Post
You are sailing down a river with a sharp bend. Is the current strongest on the outside of the bend or the inside?
Consider a rotating wheel. The angular speed is constant. Measuring the linear speed of the flow tangent to the circumference at any radius from the "axel", the speed must increase as the radius increases (preservation of angular momentum). This accounts for the fact that the deepest water is usually on the outside of a curved waterway; and, bank erosion greatest on the outside curve, due to hydraulic scouring. Further, growth of the shallows on the inside of a curve is caused when the flow of water slows, allowing sediment to settle out at a faster rate due to a reduction in the agitation of the water flow that otherwise holds solids in suspension.


"It is not so much for its beauty that the sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
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