Machine-translated by Google. Questions are authored in English.
Top

Discussion

A river will develop braided channel pattern due to significant :

  • A.Increase in the amount of coarse sediment load
  • B.Decrease in the amount of coarse sediment load
  • C.Increase in channel sinuosity
  • D.Decrease in wash load

Answer: A

A braided pattern develops with a significant increase in the amount of coarse sediment load.

When a river is supplied with more bedload sand and gravel than it can carry, it drops the excess as bars in mid-channel. Flow splits around the bars into many shallow, interlacing channels, and the bars shift with every flood. Steep gradients and highly variable discharge, as below glaciers, encourage the same result.

A decrease in coarse load would let the river concentrate into a single channel. Increasing sinuosity is the meandering tendency, the opposite style. Wash load is the fine clay and silt carried in suspension, which plays little part in building braid bars.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.