3.3 - Depositional Landforms Flashcards

1
Q

How are beaches formed?

A

Sediment is imout, transported, and deposited by constructive waves’ swash
Waves don’t have enough energy to carry sediment further

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2
Q

How do spits form?

A

LSD (waves coming in at an angle and being backwash at 90° by gravity) and sediment is extended offshore by constructive waves
Wind direction dictates the curve of the spit

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3
Q

What makes a spit recurved?

A

Two dominant wind directions causes two LSD directions

Wave refraction around tip of spit

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4
Q

How does an offshore bar form?

A

1) Waves break on a submerged bar
Sediment carries is despoiled and it accumulates vertically

2) Sediment carries by LSD along the coast
Waves enter low-energy part of sediment cell
Sediment gets deposited on submerged bars parallel to the shore

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5
Q

How do tombolos form?

A

Offshore island refracts approaching waves so convergence of two LSD directions on opposite side of the island
This creates a bar which extends out to mainland

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