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ENV 3110 Aeolian Geomorphology

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ENV 3110 ~ Aeolian Geomorphology. 2. Why are aeolian processes so important in drylands?. Windier?More sediment?Greater sediment availability?. ENV 3110 ~ Aeolian Geomorphology. 3. Deflation and Abrasion. Deflation: the removal by the wind of loose clastic particlesAbrasion: erosion by the wind

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ENV3110Dryland EnvironmentsGY3091Californian DrylandsGY3102Geomorphology of Desert Environments

Aeolian Geomorphology

ENV 3110 ~ Aeolian Geomorphology

why are aeolian processes so important in drylands
Why are aeolian processes so important in drylands?
  • Windier?
  • More sediment?
  • Greater sediment availability?

ENV 3110 ~ Aeolian Geomorphology

deflation and abrasion
Deflation and Abrasion
  • Deflation: the removal by the wind of loose clastic particles
  • Abrasion: erosion by the wind of cohesive materials as a consequence of bombardment by wind-tranported particles

ENV 3110 ~ Aeolian Geomorphology

landforms of wind erosion
Landforms of wind erosion
  • Ventifact
  • Yardang
  • Pan
  • Stone pavement

ENV 3110 ~ Aeolian Geomorphology

what are these
What are these?

ENV 3110 ~ Aeolian Geomorphology

yardang
Yardang
  • A mound composed of generally cohesive sediment whose surface has been abraded (and perhaps deflated) by the wind into an aerodynamic shape

ENV 3110 ~ Aeolian Geomorphology

what is this
What is this?

ENV 3110 ~ Aeolian Geomorphology

stone pavement
Stone pavement
  • A pebbly covering of a finer soil, which may be formed partly in some circumstances by deflation of finer material

ENV 3110 ~ Aeolian Geomorphology

stone pavement1
Stone Pavement

ENV 3110 ~ Aeolian Geomorphology

classification of dunes
Classification of dunes

ENV 3110 ~ Aeolian Geomorphology

fundamental desert sand dune types
Fundamental Desert Sand Dune Types

Dune type Wind Regime Mode of Transport

Transverse

Linear

Star

Unimodal

Bimodal

Complex

Migrating

Extending

Sedentary

ENV 3110 ~ Aeolian Geomorphology

complete the diagram wasson hyde 1983
Complete the diagram ... (Wasson & Hyde 1983)

ENV 3110 ~ Aeolian Geomorphology

dust storms and dust haze
Dust storms and dust haze

ENV 3110 ~ Aeolian Geomorphology

why so little work on dust until the 1980s
Why so little work on dust until the 1980s?
  • Erosion of dust often leaves little clear evidence of occurrence.
  • Deposition of dust does not produce distinctive landforms. Often it leaves only thin, widespread mantles.

ENV 3110 ~ Aeolian Geomorphology

loess
Loess

“A terrestrial windblown silt” (Pye, 1987, p.199)

  • commonly 50-75% quartz;
  • commonly buff colour, but also grey, red, brown, yellow;

ENV 3110 ~ Aeolian Geomorphology

loess1
Loess
  • typically modal size around 20-40 μm (sand content >20% termed “sandy loess”)
  • Syn- and post-depositional reworking is common;
  • angular and sub-angular grains.

ENV 3110 ~ Aeolian Geomorphology

smalley krinsley 1978 p 63
Smalley & Krinsley (1978, p. 63)
  • “Glacial grinding is the only natural process which efficiently converts sand-sized quartz particles totally into a silt-sized product.”

ENV 3110 ~ Aeolian Geomorphology

chinese loess
Chinese loess

ENV 3110 ~ Aeolian Geomorphology

mapping loess occurrence
Mapping loess occurrence

1984

ENV 3110 ~ Aeolian Geomorphology

mapping loess occurrence1
Mapping loess occurrence

1988

ENV 3110 ~ Aeolian Geomorphology

peridesert loess matmata plateau tunisia
Peridesert loess: Matmata Plateau, Tunisia

ENV 3110 ~ Aeolian Geomorphology

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