Aeolian Processes and Erosional Landforms

 
Aeolian Process And  Erosional Landform
 
Presented by: Pranati Manna
Dept. of Geography
Bajkul Milani Mahavidyalaya
Date: 15.03.2023
 
WIND
 
Moving air mass is known as the wind.
Produces Varieties of landforms by erosion
and deposition.
It cannot develop any landscapes by itself:
requirs some materials as tools ( Particles of
sand, silt etc.)
 
Wind Erosion
 
Chiefly three methods:
Deflation 
: The lifting and removal of loose sand,
dust particles from the Earth’s surface.
Forms shallow basins called deflation basins.
Corration or Abrasion: 
The wearing down of solid
rocks by the impact of wind borne particles.
Attrition
 : Wind blown particles collide each other
and get worn.
 
Transportation By Wind
 
Three methods:
Saltation 
: results from impact and elastic
bounce.
Suspension
 : particles are lifted high into
atmosphere and are carried great distances
before they settle.
Rolling or Traction
: the movenment of
particles on ground.
The coarser fragments are carried in this
way
 
Deposition  By Wind
 
                   Causes :
 Any obstruction to wind
Reduction in velocity
Increased load
 Rain
 
Aeolian Landforms
 
 Are formed by the erosion and deposition of windblown
sediments.
 The sediments are generally sourced from deserts, glacial
deposits, rivers or coastal shorelines.
 Aeolian sediments are often composed of well- rounded,
sand- to- silt- sized particles, that are weathered by wind
abrasion during  transport.
 Sediments are deposited when the velocity of the wind
falls and there is not enough energy avaliable to entertain
and transport the sediments . Sands will begin to
accumulate wherever they are deposited and often
continue to move along the ground
 
Erosional Landforms
 
Deflation Basins
 
Depressions formed from barren
unconsolidated material.
Formed by eddy air currents.
Also known as deflation hollows or
blow outs.
Measure from few centimetres to
several kilometres across
Depth up to 10 km
 
 
 
DEFLATION BASIN
 
MUSHROOM TABLE AND PEDESTAL ROCKS
 
Isolated rocks from  which the base has been
partially cut by the undercutting of the wind.
A common mushroom- shaped landform
created by wind erosion .
 
 
 
MUSHROOM ROCK
 
YARDUNG
 
A yardung is an elongate ridge or remnant
rock feature sculpted by abrasive action .
Oriented parallel to the prevailing wind.
 
YARDUNG
 
ZEUGEN
 
A zeugen is a conspicuous , tabular pile of
durable rock in the desert.
Typically , layers of both hard and soft rocks
alternate.
 
Zeugen
 
VENTIFACT
 
Formed by abrasion effect.
Stones with flat surfaces.
Commonly distinguished by two or more flat
faces meeting at sharp ridges generally well
polished.
The windward face of the rock is flattend and
smoothened.
If has one smooth surface then known as
EINKANTER and if  three DREINKANTERS.
 
 
 
                       VENTIFACT
 
DESERT PAVEMENTS OR LAG DEPOSITS
 
Formed when wind carries finer, more
lightweight particles such as sand away.
Large particles are left behind and protected
from further erosion – desert pavements.
Also called as desert armor.
The areas covered with large sized rocks are
called Hamadas.
 
Desert Pavement
 
Thank You
 
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Aeolian processes, driven by wind, shape landscapes through erosion and deposition. This presentation by Pranati Manna explores wind erosion methods like deflation, corrasion, and attrition, as well as transportation and deposition mechanisms. Aeolian landforms, including deflation basins, mushroom tables, and pedestal rocks, are formed through the interaction of wind-blown sediments with various environments. Understanding these processes enriches our knowledge of geological formations influenced by wind.

  • Aeolian processes
  • Erosional landforms
  • Wind erosion
  • Sediment deposition
  • Geological formations

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  1. Aeolian Process And Erosional Landform Presented by: Pranati Manna Dept. of Geography Bajkul Milani Mahavidyalaya Date: 15.03.2023

  2. WIND Moving air mass is known as the wind. Produces Varieties of landforms by erosion and deposition. It cannot develop any landscapes by itself: requirs some materials as tools ( Particles of sand, silt etc.)

  3. Wind Erosion Chiefly three methods: Deflation : The lifting and removal of loose sand, dust particles from the Earth s surface. Forms shallow basins called deflation basins. Corration or Abrasion: The wearing down of solid rocks by the impact of wind borne particles. Attrition : Wind blown particles collide each other and get worn.

  4. Transportation By Wind Three methods: Saltation : results from impact and elastic bounce. Suspension : particles are lifted high into atmosphere and are carried great distances before they settle. Rolling or Traction: the movenment of particles on ground. The coarser fragments are carried in this way

  5. Deposition By Wind Causes : Any obstruction to wind Reduction in velocity Increased load Rain

  6. Aeolian Landforms Are formed by the erosion and deposition of windblown sediments. The sediments are generally sourced from deserts, glacial deposits, rivers or coastal shorelines. Aeolian sediments are often composed of well- rounded, sand- to- silt- sized particles, that are weathered by wind abrasion during transport. Sediments are deposited when the velocity of the wind falls and there is not enough energy avaliable to entertain and transport the sediments . Sands will begin to accumulate wherever they are deposited and often continue to move along the ground

  7. Erosional Landforms Deflation Basins Depressions formed from barren unconsolidated material. Formed by eddy air currents. Also known as deflation hollows or blow outs. Measure from few centimetres to several kilometres across Depth up to 10 km

  8. DEFLATION BASIN

  9. MUSHROOM TABLE AND PEDESTAL ROCKS Isolated rocks from which the base has been partially cut by the undercutting of the wind. A common mushroom- shaped landform created by wind erosion .

  10. MUSHROOM ROCK

  11. YARDUNG A yardung is an elongate ridge or remnant rock feature sculpted by abrasive action . Oriented parallel to the prevailing wind.

  12. YARDUNG

  13. ZEUGEN A zeugen is a conspicuous , tabular pile of durable rock in the desert. Typically , layers of both hard and soft rocks alternate.

  14. Zeugen

  15. VENTIFACT Formed by abrasion effect. Stones with flat surfaces. Commonly distinguished by two or more flat faces meeting at sharp ridges generally well polished. The windward face of the rock is flattend and smoothened. If has one smooth surface then known as EINKANTER and if three DREINKANTERS.

  16. VENTIFACT

  17. DESERT PAVEMENTS OR LAG DEPOSITS Formed when wind carries finer, more lightweight particles such as sand away. Large particles are left behind and protected from further erosion desert pavements. Also called as desert armor. The areas covered with large sized rocks are called Hamadas.

  18. Desert Pavement

  19. Thank You

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