Aeolian Geomorphology

The study of the interaction of wind and wind processes with the earth's surface

1. Entrainment
2. Transport
3. Deposition

- Once wind speed exceeds a critical level (fluid threshold), sediment will be entrained
- airflow over a grain causes lift due to the low pressure that develops, similar to airplane wing
- The weight, shape and height of the particle determines what speed is required to decouple (lift) the particle off the bed

- Moisture content
- Roughness elements (shelter areas, reduce wind speeds)
- Supply of sediment
- Transport capacity of wind

When wind speeds dip below the fluid threshold

A complex dune form characterized by a series of slip faces radiating about a central point, producing a rough star shape
- such dunes are the product of highly variable wind directions

- A large, elongated dune lying parallel to the prevailing wind direction
- Generally form in areas that are located behind an obstacle where sand is abundant and the wind is constant and strong

- A u-shaped mound of sand
- Vegetation stabilizes the arms, not allowing for transport to occur while the rest of the dune migrates away causing the arms to project upwind from the dune

- Most common type of dune
- These dunes form under high unidirectional winds with little vegetation present
- Arms project down wind

A linear dune is the product of two prevailing winds which alternate, either daily or seasonally

Rocks that have been abraded, pitted etched, grooved, or polished by wind-driven sand or ice crystals

The result of the gradual removal of sand, dust and other fine grained material wind and rainfall, leaving behind only the larger material behind

- Streamlined bill carved from bedrock or any consolidated or semi-consolidated material through the action of wind abrasion, dust and sand, and erosion

Used for:
Erosion control
Habitat control
Public safety - blowing snow; air quality