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| Alluvial fan, French Pyrenees |
- An alluvial fan is a fan/cone shaped landform.
- Deposit of sediment crossed & built up by streams.
- Debris flows called a debris cone /colluvial fan.
- These flows come from a single point.
- Source at the apex of the fan.
- Fans are found in canyon draining from mountainous terrain.
- It emerges out onto a flatter plain.
- Alluvial fans into a single apron is called a bajada(compound alluvial fan)
- Alluvial fans are found in desert areas.
- Periodic flash floods from nearby thunderstorms in local hills.
- The watercourse in an arid climate has leading to a narrow defile.
- Phreatophytes are plants concentrated at the base of alluvial fans.
- Alluvial fans also develop in wetter climates.
- Alluvial fans are subject to flooding.
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