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Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536

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BuyFindarrow_forward

Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536
Textbook Problem

How does an alluvial fan differ from a pediment?

To determine

The differences between an alluvial fan and a pediment.

Explanation

When the streams in arid areas such as ephemeral, intermittent or even perennial rovers flow out of narrow upland canyons onto the open, less-confining lowland plains, the channels become shallow and wide. Since the stream discharge equals cross-sectional width and depth of channel multiplied with the velocity of flow, the increase in width results in the flow velocity decrease, thereby reducing stream capacity, which can be defined as the maximum size of load and the stream capacity, which is the maximum amount of load. As the water seeps into the coarse channel alluvium, the discharge decreases downstream. It leads to the deposition of sediments that are carried by streams emerging from mountain front canyon along the base of the highlands.

The stream channel is constrained by bedrock valley walls in the upstream portion of canyon mouth. However, the area where it flows beyond the mouth of canyon, the channel widen and shift its position laterally. Initially, the sediments are deposited just beyond the mouth of canyon and build up the lowland area near the mountain front. As a result, the channel shifts laterally to the area where deposition initiated and builds up another zone close to the mountain front and adjacent to the first aggraded area due to aggradation...

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