1.c. coastal sediment is supplied from a variety of scources

Question 1

describe offshore contributions to the coastal sediment supply

Answer 1

constructive waves bring sediment to shore from offshore. Tides and currents do the same. Wind blows sediment from other locations

Question 2

decribehuman contributions to coastal sediment supply

Answer 2

beach nourishment helps maintain sediment equilibrium

so do other types of human intervention eg. groynes

Question 3

describe the terrestrial sources of coastal sediment

Answer 3

1. rivers - up to 90% of coastal sed , esp coasts with steep gradients, occurs a lot during floods.
2. wave erosion - large amount of sed.
   - eg. cliff erosion increased by rising sea levels + Storm surge events
   - weak cliffs + high energy environments can contribute up to 70% of material supplied to beaches
3. LSD

Question 4

what erosion processes do fluvial and wave use?

Answer 4

Abrasion, attrition, hydraulic action, pounding, solution

Question 5

what transportation processes do fluvial and wave use?

Answer 5

solution, saltation, suspension, traction

Question 6

deposition; rivers to sea

Answer 6

1. most rivers sediment load is deposited at the mouth due to loss of energy
2. when fresh water meets salt water the flocculation of clay occurs; [fine light materials clump together due to electrical charges between them] making them heavier so they sink.