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Flashcards in Coasts Deck (49)
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1

What is longshore drift?

Material being transported along the coast

2

How does longshore drift work?

Waves follow prevailing wind. Hit coast at oblique angle. Swash carries material on beach in direction of wind, backwash carries material off beach at 90 degrees.

3

What are the 4 processes of transportation?

Traction, saltation, solution and suspension

4

What is traction?

Large particles (boulders) pushed along sea bed by force if water

5

What is saltation?

Pebble sized particles bounced along sea bed by force of water

6

What is suspension?

Small particles (silt/clay) carried along in sea water

7

What is solution?

Soluble materials dissolve in sea water and carried along

8

What is deposition?

When material carried by sea water is dropped on coast

9

When do coasts build up?

When amount of deposition is higher than amount of erosion

10

How is amount of deposition increased?

When lots of erosion elsewhere on coast - lots of material available.

When lots of transportation of material into an area

11

What do low eve energy waves do?

(Slow) lots of deposition, less erosion

12

What do constructive waves do?

Deposit more than erode. Break up on beach, build up beaches

13

When are constructive waves created?

In calm weather

14

What are the characteristics of constructive waves?

Stronger swash than backwash. Less powerful than destructive. Low, long wavelength. Low frequency (6-8 per minute).

15

What is transportation?

The movement of material

16

What is longshore drift?

Material being transported along the coast

17

How does longshore drift work?

Waves follow prevailing wind. Hit coast at oblique angle. Swash carries material on beach in direction of wind, backwash carries material off beach at 90 degrees.

18

What are the 4 processes of transportation?

Fractions, saltation, solution and suspension

19

What is traction?

Large particles (boulders) pushed along sea bed by force if water

20

What is saltation?

Pebble sized particles bounced along sea bed by force of water

21

What is suspension?

Small particles (silt/clay) carried along in sea water

22

What is solution?

Soluble materials dissolve in sea water and carried along

23

What is deposition?

When material carried by sea water is dropped on coast

24

When do coasts build up?

When amount of deposition is higher than amount of erosion

25

How is amount of deposition increased?

When lots of erosion elsewhere on coast - lots of material available.

When lots of transportation of material into an area

26

What do low eve energy waves do?

(Slow) lots of deposition, less erosion

27

What do constructive waves do?

Deposit more than erode. Break up on beach, build up beaches

28

When are constructive waves created?

In calm weather

29

What are the characteristics of constructive waves?

Stronger swash than backwash. Less powerful than destructive. Low, long wavelength. Low frequency (6-8 per minute).

30

What is transportation?

The movement of material