wunder beta🌊 How Rivers Draw Their Bends
Follow erosion and deposition around a river bend, then watch meanders migrate and leave oxbow lakes behind.
What you’ll learn
- A bend starts smallExplain how a small irregularity can become a river bend.Faster water erodes the outside bank while slower water deposits sediment on the inside.
- The river moves sidewaysDescribe how meanders migrate and identify the controls on their movement.Outer-bank erosion and inner-bank deposition move a channel sideways and often downstream.
- When a bend lets goExplain how a meander cutoff creates an oxbow lake.A shorter channel can leave the former loop beside the river, where sediment may seal it off.
Questions this course answers
What usually happens at the outside and inside of a river bend?
The current is faster near the outside bank and slower near the inside bank, favoring erosion outside and deposition inside.
Why can a meandering river move sideways without becoming much wider?
A channel can lose material at its cut bank while gaining material on its point bar, shifting its position.
How does an oxbow lake usually begin?
A cutoff creates a shorter channel, leaving the former loop beside the river; sediment may then close its entrances.
Which combination helps explain why one river reach meanders?
Meander patterns emerge from several interacting controls, including flow, slope, sediment, bank material, and room to move.
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