Coastal Landforms Flashcards
Coastal transport: Beach drift -
Waves travels at an angle up the beach, but the backwash flows straight back down the beach.
Coastal transport: Longshore drift -
A combination of Longshore current and beach drift.
Coastal transport: Longshore current -
Oblique angled waves hit the shoreline, they are refracted and generate a Longshore current.
Coastal deposition:
Sediment is deposited.
Coastal deposition: Spits -
Long ridges projecting from land, ending in the open sea.
Coastal deposition: Bay barrier -
When a spit extends completely across a bay.
Coastal deposition: Tombolas -
Like a spit, but connects one island to another, or to the mainland.
Coastal deposition: Barrier islands -
Long islands of sediment, which lie offshore and parallel to the coast.
Beach budgets: Used to show
Whether a beach is showing net gain or loss in volume.
Beach budgets: Shore line advances when
Positive, and retreats when negative.
Beach budgets: Balances when
Ad + Aw = Rd + Rw
(Added) (Removed)
d - by longshore drift.
w - by the wind.
Beach budgets: Positive when
Cf > Cs
Cf - Amount of sand present at the end of the time period.
Beach budgets: Negative when
Cf < Cs
Erosional landforms: Sediment is
Removed form the coastline, mainly as a result of wave action.
Erosional landforms: Steep rock faces occur when
Erosion rates are high, gentle rock faces occur with gentler wave action.
