In his book Thames: Sacred River, Peter Ackroyd's opening chapter, "The river as fact," states, "The main thrust of the river flow is known to hydrologists as the 'thalweg'; it does not move in a straight and forward line but, mingling with the inner flow and the variegated flow of the surface and bottom waters, takes the form of a spiral or helix." I have an image of the water sliding over and around itself in a kind of perpetual corkscrew. What does it mean for the flow when it has a cover of ice?
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