The scraping, scouring and rubbing action of materials carried along by a river. Most effective in short turbulent periods when the river is in flood.
1 of 6
Hydraulic Action
Movement of loose unconsolidated material due to the frictional drag of the moving water on sediment lying on the channel bed. Occurs at high velocity and can be locally strong within rapids or below waterfalls.
2 of 6
Attrition
Fragments striking one another as well as the river bed.
3 of 6
Corrasion
Minerals in rocks are dissolved by weak acids in the river water and carried away in solution, Most active on rocks that contain carbonates such as limestone and chalk.
4 of 6
Vertical erosion
Occurs predominantly in the upper course where the river attempts to cut down to the base level. Abrasion and hydraulic action are most common in helping vertical erosion.
5 of 6
Lateral erosion
Occurs predominantly in the middle/lower course.
6 of 6
Other cards in this set
Card 2
Front
Movement of loose unconsolidated material due to the frictional drag of the moving water on sediment lying on the channel bed. Occurs at high velocity and can be locally strong within rapids or below waterfalls.
Back
Hydraulic Action
Card 3
Front
Fragments striking one another as well as the river bed.
Back
Card 4
Front
Minerals in rocks are dissolved by weak acids in the river water and carried away in solution, Most active on rocks that contain carbonates such as limestone and chalk.
Back
Card 5
Front
Occurs predominantly in the upper course where the river attempts to cut down to the base level. Abrasion and hydraulic action are most common in helping vertical erosion.
Comments
No comments have yet been made