landforms and landscapes of deposition - barrier beach/bars Flashcards

1
Q

when do barrier beaches occur?

A

when a beach or spit extends across a bay to join to headlands

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2
Q

what do barrier beaches trap?

A

water forming a brackish lagoon which is sepretated from the sea

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3
Q

what can they form from?

A

contemporary processes or due to rising sea levels after the last glacial period - glaciers deposident sediment in the coastal zone

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4
Q

when does barrier beach become a barrier island?

A

if it is speerted from the mainland

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5
Q

what kind of areas are barrier beaches common in?

A

low tidal ranges

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6
Q

what is a tombolo?

A

bar or beach that connects the mainland to an offshore island

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7
Q

why are tombolos formed?

A

due to wave refraction off the coastal island reduce wave velocity

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8
Q

what is an offshore region?

A

where sand is deposited - as waves dont have enough energy to carry sediment to shore - they absorb wave energy

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9
Q

what provides an important sediment input into coastal zone (offshore bars)?

A

waves may pick up sediment from an offshore bar

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10
Q

when else are offshore bars formed?

A

when backwash removes sediment from a beach?

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