Coasts - Depositional Landforms Flashcards
1
Q
swash
A
waves, driven by prevailing wind, push material up beach at an angle
2
Q
backwash
A
sediment dragged back by g down the beach at 90º
3
Q
spit
A
- spit = narrow accumulation of sand/gravel deposits w/ 1 end attached to the mainland & the other end projecting out into sea (1)
- sand spits r formed via longshore drift, explain (1)
- explain swash (1)
- explain backwash (1)
- spits form when theres a change in direction on coastline but longshore drift continues (1)
- sediment is deposited in shallow water as waves lose energy & eventually builds up above sea level (1)
- spit develops as long as supply of deposits > amount of erosion (1)
- shape can become hooked or curved at end in response to changes in wind direction (1) in sheltered area behind the spit, deposition occurs = marsh & mudflats can develop (1)
- e.g. Hurst spit, Hampshire (1)
4
Q
longshore drift
A
carries sediment along the beach in a zig-zag motion
5
Q
tombolo
A
- tombolo = narrow accumulation of sand/gravel deposits w/ 1 end attached to the mainland & the other end attached to 1/2 islands (1)
- sand spits r formed via longshore drift, explain (1)
- explain swash (1)
- explain backwash (1)
- spits form when theres a change in direction on coastline but longshore drift continues (1)
- sediment is deposited in shallow water as waves lose energy & eventually builds up above sea level (1)
- spit develops as long as supply of deposits > amount of erosion (1)
- e.g. chesil beach, dorset which connects isle of portland to dorset coast (1)
6
Q
bar
A
- bar = narrow accumulation of sand/gravel deposits that links two headlands together (1)
- sand spits r formed via longshore drift, explain (1)
- explain swash (1)
- explain backwash (1)
- spits form when theres a change in direction on coastline but longshore drift continues (1)
- sediment is deposited in shallow water as waves lose energy & eventually builds up above sea level (1)
- spit develops as long as supply of deposits > amount of erosion (1)
- e.g. slapton ley (1)