Coastal systems& landscapes Flashcards

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1
Q

What is the first step to the coastal sediment budget?

A

More material is added to the cell than is removed. This causes a net accreation of material.

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2
Q

What type of budget is it when material is added to the beach?

A

Positive budget or a surplus of sediment.

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3
Q

The positive budget or surplus of sediment causes the shoreline to do what?

A

Build towards the sea.

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4
Q

When more material is removed from the cell then added what is this called?

A

A negative budget or a deficit to sediment supply.

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5
Q

The negative budget or a deficit to sediment supply does what to the shoreline?

A

Shoreline retreats landward.

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6
Q

Oxidation causes rocks to do what?

A

Disintergrate when the oxygen dissolved in water reacts with the rock minerals.

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7
Q

When the oxygen reacts what does this produce ?

A

Oxides&hydroxides

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8
Q

What is surface creep?

A

Similar to traction, where the wind rolls or slides sand grains along the surface.

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9
Q

What is saltation?

A

Where the wind is strong enough to temporary lift the grains into the airflow to heights up to 1 meter.

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10
Q

When does deposition occur?

A

When sand& shingle accumulate faster than they are removed.

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11
Q

When deposition occurs the waves do what?

A

They slow following breaking

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12
Q

For deposition to occur the water does what?

A

Water pushes at the top of the awash before backwash begins.

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13
Q

When does marine deposition take place?

A

Where waves are low energy or where rapid coastal eroison provides a large amount of material.

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14
Q

Marnie deposition also occurs when water percolates into what ?

A

The beach material as backwash takes it back down the beach.

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15
Q

Where do Marnie processes operate?

A

Upon the coastline and are connected with the sea, such as waves.

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16
Q

Where do sub-aerial processes operate on?

A

On the land but effect the shape of the coastline, such as weathering, mass movement& run off.

17
Q

When does hydration occur ?

A

Rocks are more susceptible to further chemical weathering. Involves further addition of water, rock expands.

18
Q

When does hydrolysis occur?

A

Where mildly acidic water reacts or combines with minerals in the rock to create clays& dissolvable salts.