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Questions and Answers
What are levees?
What are levees?
Levees are natural landforms in the lower curve as a result of deposition and sediment aggregation They stand as ridges of sediment along the banks of a river.
What happens when river discharge exceeds bankfull level?
What happens when river discharge exceeds bankfull level?
The river flows & water spills out laterally across the floodplain. As the wetted perimeter increases, friction increases, resulting in a lower level of river efficiency and velocity.
What is deposition?
What is deposition?
As river energy decreases, river loses competence, and larger heavier bluff sized particles are deposited first along the bends of a river channel. Deposited particles become increasingly smaller with distance from the channel & the smallest particles are the bluff line. There is a gradation evident in terms of particle size.
What are raised banks?
What are raised banks?
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Study Notes
Levees
- Levees are natural landforms in the lower course of a river.
- They are formed by the deposition of sediment along the riverbanks.
- They form ridges of sediment.
River Discharge and Flooding
- Flooding occurs when river discharge exceeds bankfull level.
- Lateral erosion of the riverbanks occurs.
- This leads to a lowered river efficiency and an increase in velocity.
- Water spills out into the flood plain.
- Friction increases.
Deposition
- As river energy decreases, the river loses competence.
- Larger, heavier particles are deposited first along the riverbanks.
- As the distance from the channel increases, smaller particles are deposited.
- This creates a gradation in particle size, with the largest particles closest to the river channel.
- Gradual deposition results in the formation of levees.
Repetition of Flooding and Deposition
- Repeated flooding and deposition events result in the formation of multiple levees along the river channel.
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Description
Explore the dynamics of river systems, focusing on levees, river discharge, and deposition processes. Understand how flooding impacts the formation of levees and the gradation of sediments. This quiz covers key concepts in geomorphology related to river environments.
