Rivers Flashcards
What is abrasion ?
Rocks scrape away bed and banks
What is hydraulic action ?
The force of water hitting the bed and banks.
What is attrition ?
Rocks bang against each other and break down smaller.
What is solution?
Soluble Materials dissolve and are carried along.
What is suspension?
Small particles carried by water.
What is traction?
Boulders and rocks that are rolled along the river bed.
What is saltation?
Pebbles that are bounced along the river bed?
What is lag time ?
The time from peak rainfall to peak discharge.
What is interception?
Trees or greenery stop water from reaching the ground.
What is infiltration?
Water soaks into the soil.
State the main activity at :
Upper course -
Middle course -
Lower course -
Upper course - verticals erosion
Middle course - lateral erosion
Lower course - deposition
What is thalweg ?
The line of fastest flow
Where is a slip off slope on a meander?
How is a slip off slope created?
The inside bend of a meander.
Deposited sediment.
Where on a meander is a river cliff?
How is a river cliff created?
The outside bend.
Erosion causing undercutting of the bank.
