Definition:
It is associated with the presence of pools and riffles in the river bed. The erosion and deposition of river load by helicoidal flow is responsible for the creation of meanders.
The top current hits against the river bank, undercutting and eroding material from it. Its bottom (subsidiary) current then carries the eroded material and deposit them in the next inner bank slightly downstream where the river flow is slower.
This cause the river to become more asymmetrical through time. Once established, a meandering pattern is self-perpetuating and the meanders become more and more accentuated - meaning the amplitude of the bends are increased and the meanders become more pronounced.
Helicoidal flow is a cockscrew (spiral) movement of water responsible for moving eroded river load from the outer bank and then depositing much of it on the next inner bank of a river.
It is associated with the presence of pools and riffles in the river bed. The erosion and deposition of river load by helicoidal flow is responsible for the creation of meanders.
The top current hits against the river bank, undercutting and eroding material from it. Its bottom (subsidiary) current then carries the eroded material and deposit them in the next inner bank slightly downstream where the river flow is slower.
This cause the river to become more asymmetrical through time. Once established, a meandering pattern is self-perpetuating and the meanders become more and more accentuated - meaning the amplitude of the bends are increased and the meanders become more pronounced.
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ReplyDeletehi, i have a question. i tried drawing out this helicoidal flow, and it was going pretty well for the first meander. however when it reached the second meander, the surface flow is towards the inner bank, and the bottom flow is to the outer bank. is this correct?
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