Changes in the processes along the long profile of a river.

Question 1

Upper course erosion.

Answer 1

Abrasion and hydraulic action.

Mostly vertical.

Question 2

Upper course transportation.

Answer 2

Load size varies.

Large boulders are moved in times of high discharge and they roll and bounce banging against the river bed.

Question 3

Upper course deposition.

Answer 3

All coarse material stays where it is when a river reduces its discharge.

Question 4

Middle course erosion.

Answer 4

Mainly hydraulic.

Less vertical erosion and more lateral.

Question 5

Middle course transportation.

Answer 5

Smaller load size moved along the river bed through traction or saltation.
Finer material is moved in suspension during floods.

Question 6

Middle course deposition.

Answer 6

Deposition of sand and gravel occurs on the insides of meanders.
Some flood plain deposits occur then the river overflows.

Question 7

Lower course erosion.

Answer 7

Reduced but there is some hydraulic action in the beds.

Question 8

Lower course transportation.

Answer 8

Sand is moved along the river bed by traction and fine materials are moved in suspension.

Question 9

Lower course deposition.

Answer 9

This consists of fine silts and clays.

Coarser material is dropped to form levees in times of flood.