Rivers ; processes Flashcards
Name all types of erosion.
hydraulic action
attrition
abrasion
solution
Describe hydraulic action.
process involves the force of water against the bed and banks.
Describe abrasion.
process which the beds and banks are worn down by the river’s load.
river throws these particles against the beds and banks at high velocity.
Describe attrition.
material carried by the river bump into each other and are broken down unto smaller particles.
Describe solution.
chemical action of the river water. the acids in the water slowly dissolve the bed and the banks.
Name all types of transportation.
traction
saltation
suspension
solution
Describe traction.
where boulders and pebbles are rolled along the river bed at times in high discharge.
Describe saltation.
sand-sized pebbles are bounced along the river bed by the flow of water.
Describe suspension.
fine clay and sand particles are carried along within the water, even at low discharges.
Describe solution.
some minerals such as calcium carbonate dissolve in water, requires very little energy.
When does deposition happen?
river channel is shallower
river velocity decreases
river discharge is less
