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- Rivers and streams weather and erode the Earth but they also build it up by depositing the material they erode downstream. The way in which it is deposited creates the typical shape of a meandering river. A river slowly winding its way through flat land flows a little bit faster on the outside riverbank than on the inside riverbank.
www.bgs.ac.uk/discovering-geology/geological-processes/erosion/
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Abrasion occurs when sediment carried by the water hits the river channel and removes material in a sandpapering effect. Attrition happens when stones carried by...
- Erosion, weathering and mass movement
Erosion is the process that wears away the river bed and...
- Revision 1
Erosion is the process that wears away the river bed and...
- Erosion, weathering and mass movement
Erosion is the process that wears away the river bed and banks. Erosion also breaks up the rocks that are carried by the river. There are four types of erosion: Hydraulic action - This is...
Erosion is the process that wears away the river bed and banks. Erosion also breaks up the rocks that are carried by the river. There are four types of erosion: Hydraulic action - This is the...
- What Is Abrasion Or Corrasion?
- What Is Attrition?
- What Is Hydraulic Action?
Abrasion, also known as corrasion, is when boulders and stones wear away the river banks and bed. Angular rocks that have entered the channel recently are valuable tools of abrasion because they are more angular. Abrasion is responsible for the river channel’s lateral and vertical erosion (see below).
Attrition is when sedimentparticles knock against the bed or each other and break, becoming more rounded and smaller as you move down the river.
Hydraulic action is when the force of fast-flowing water hits the bed and banks and forces water and air into cracks in the bedrock. The repeated changes in air pressure cause the river bed to weaken. Hydraulic action causes vertical (downward) erosion in the upper part of the river and lateral (sidewards) erosion to the banks in the lower stretch ...
Managed flows provide opportunities for monitoring riverbank response to flows, which in turn informs planning. The results demonstrate that environmental flows have little influence on bank erosion and visual perceptions in the absence of monitoring are an unreliable guide.
- Geoff J Vietz, Anna Lintern, J Angus Webb, David Straccione
- 2018
Rainfall has a significant impact on river processes and landscapes. Rivers in areas of the UK with wetter climates have a higher discharge as there is more water entering the channel. Rates of erosion increase with discharge as the river has more energy to erode the river bed and banks.
The fastest water flow (thalweg) is on the outside of the river bends, leading to erosion. The erosion undercuts the riverbank, forming a river cliff. The riverbank collapses and the edge of the meander moves further out. The slowest flow is on the inside of the river bends, leading to deposition
