fluvial landforms

information on the formation of several fluvial landforms found in hot enviroments

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Fluvial landforms (hot environments)
Ephemeral flows
Seasonal rivers that only flow after periods of rain or thunderstorms
They occur due to large convectional storms, little vegetation and
impermeable ground.
They are high in energy and carry a large load of rock debris.
High levels of abrasion and lateral/ vertical erosion.
Short lag time (they flood quickly after the period of rainfall)
Wadis/ arroyos
Dried up river bed in Africa, these are called arroyos in the USA.
Large amount of deposited alluvium on the valley floor
Sparse vegetation cover (but dense compared to the surrounding area that
is usually a desert with little vegetation)
Alluvial fans
Cone shaped fans of alluvium deposited at the end of the valley
Main processes are deposition
A river in a mountain valley has high energy as it is restricted by the valley
walls, when it leaves the valley it is no longer restricted and is able to
spread out, therefore it loses this energy quickly.
The alluvium is spread out in a fan shape as the water when it leaves the
valley spreads out over the area, depositing the alluvium at this point.
Example: Panamint range, death valley, California

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Temporary lakes in shallow inland a basins
Main processes include: insolation, deposition
When rivers flow into these basins they form temporary lakes.…read more

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Narrow river valleys with near vertical edges
There are two types slot canyon and step canyon.
Slot canyons are made up of high resistant rock, so only vertical erosion is
possible, this keeps the canyon narrow and steep edged.
Step canyons are made of alternate horizontal layers of high and low
resistant rock, which allows vertical erosion but also some lateral erosion,
therefore this type of canyon tends to be wider.…read more


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