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8GEO1 - 2. Coasts - Depositional Coastlines > Sediment Cells > Flashcards

Sediment Cells Flashcards

1
Q

Transportation - Traction

A

Sediment rolls along floor

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2
Q

Transportation - saltation

A

Bounces along - 2-10cm above beach

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3
Q

Transportation - suspension

A

Carried along in column of water (makes water muddy)

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4
Q

Transportation - solution

A

Dissolved in water

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5
Q

Deposition - gravity settling

A

Heavier particles lose energy so can’t transport anymore - fall

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6
Q

Deposition - flocculation

A

Clay particles attract and clump together

Increased mass means lose energy - falls

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7
Q

LSD

A

Most efficient at 30°swash

Backwash at 90° because of gravity

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8
Q

Drift aligned beach

A

Aligned to diagonal swash (LSD)

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9
Q

Swash aligned beach

A

Aligned to parallel swash and backwash (90°)

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10
Q

Sediment cell (11 in UK)

A

Closed system or sources, transfer and sinks of sediment

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11
Q

Sediment cell - sources

A 
Cliff erosion
Onshore currents 
River transport 
Wind sediment (land)
Subaerial processes
Marine organisms
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12
Q

Sediment cell - transfers

A 
Littoral drift
LSD
Swash and backwash 
Tidal and ocean currents 
Wind
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13
Q

Sediment cell - sinks

A

Back shore (sand dunes)
Foreshore (spits and beaches)
Nearshore (bars)
Offshore (barrier islands)

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14
Q

Coastline topography

A

Shapes and divides the land (headlands)

Creates the sub cells of the sediment cell

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16
Q

Dynamic equilibrium

A

Inputs from sources balances deposits in sink

Constant sediment movement

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17
Q

Changes to dynamic equilibrium

A

Climate change
More erosion
Storm even can disrupt
Seasonal change

18
Q

Negative feedback

A

Change has effects that work against original change

Erosion leads to rockfall - collapsed debris acts as barrier against waves - less erosion

19
Q

Positive feedback

A

Change has effects that increase original change

More wind erosion during storm removed vegetation - leads to more wind since less blocking

8GEO1 - 2. Coasts - Depositional Coastlines (10 decks)

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