Dams cause erosion of the upstream channel.

Question

BlackTom AI · Accepted Answer

The statement to evaluate is: 'Dams cause erosion of the upstream channel.'

Option 1 (True): If one considered this option, we would claim that dams actively erode the channel upstream. In practice, upstream of a dam, the reservoir tends to trap and deposit sediment, leading to sedimentation rather than erosion. Water slows as it enters the reservoir, reducing its energy and causing sediments to settle. Therefore, describing the upstream channel as undergoing erosion due to a dam is misleading; the typical upstream effect is siltation and delta-like buildup, not erosion.

Option 2 (False): This is the correct assessment. Dams more commonly cause sediment trapping upstream, forming a reservoir with reduced flow velocity and increased deposition, while downstream channels often experience changes in bedload due to sediment-starved water, which can lead to downstream incision or other morphologic adjustments. The key idea is that erosion is not the primary upstream response; deposition dominates upstream, and erosion, when it occurs, is more characteristic of downstream reaches or in other parts of the river system affected by altered sediment transport and hydrology, not the immediate upstream channel adjacent to the dam.

ESCI 1012 (001) Quiz 5 Flooding

Dams cause erosion of the upstream channel.

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