What is a floodplain and how is it formed? ...

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What is a floodplain and how is it formed?

Question 2

Net deposition of sediments results in a building up, or _______________, of the landscape.
 Fill in the blank(s) with correct word

[Chou]

Answer to Question 1

Floodplains constitute the often extensive, low-gradient land areas composed of alluvium that lie adjacent to many stream channels. Floodplains are aptly named because they are inundated during floods and because they are at least partially composed of vertical accretion deposits, the sediment that settles out of slowing and standing floodwater. Most floodplains also contain lateral accretion deposits. These are generally channel bar deposits that get left behind as a stream gradually shifts its position in a sideways fashion (laterally) across the floodplain. As the meandering stream wanders from side to side, it widens the valley by lateral erosion before leaving behind those lateral accretion deposits.

Answer to Question 2

aggradation

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Gracias!

[elyse44]

Thanks for the timely response, appreciate it