Transcript Fluvial modelling

UNIT
11
The evolution of landforms
WIND ACTION
Biology & Geology. Secondary Education, Year 4
UNIT
11
Wind action
• The wind is a fundamental factor in the morphology of desert
landforms.
Suspension
• Wind action has three mechanisms:
• Deflation or removal of loose material
due to entrainment, saltation or
suspension.
• Wind abrasion or wearing away of
the rocks as the wind breaks off and
transports fine particles.
• Deposition of materials or
accumulation of the transported
fragments when the wind loses energy.
Biology & Geology. Secondary Education, Year 4
Entraiment
Saltation
UNIT
Wind action
11 Types of landforms according to wind action
• The action of the wind generates different types of landforms in the
desert.
Rocky
desert
Pebble
desert
Sandy
desert
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Biology & Geology. Secondary Education, Year 4
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UNIT
11
Wind action
Types of landforms according to wind action
Rocky desert
Fungiforms rocks
• This type of desert is
composed of large rock
formations, which are worn
away by abrasion (with cavities,
arches and fungiform rocks)
and cleaned of any loose
material due to deflation.
• Se observan estructuras como
cavidades, arcos y rocas
fungiformes.
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Biology & Geology. Secondary Education, Year 4
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UNIT
11
Wind action
Types of landforms according to wind action
Pebble desert
• This type of desert is a flatter
zone at the foot of the rocky
desert.
• Deflation carries the fine
materials (sand and dust) away
from this zone and leaves
behind the heavier material
(gravel and blocks).
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Biology & Geology. Secondary Education, Year 4
UNIT
11
Wind action
Types of landforms according to wind action
Sandy desert
• The wind deposits the sand it
has transported in this area.
• In this type of desert, fields of
dunes are formed, oriented in the
direction of the predominant
wind.
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Biology & Geology. Secondary Education, Year 4