Coastal Landforms Formed By Deposition Flashcards
What is Known as the Movement of Material?
Transportation.
Material is Transported Along Coasts by a Process Called what?
Longshore Drift.
Formation of Longshore Drift?
- Waves Follow the Direction of the Prevailing Wind, Usually Hitting the Coast at an Oblique Angle.
- The Swash Carries Material Up the Beach, in the Same Direction as the Waves.
- The Backwash then Carries Material Down the Beach at Right Angles, Back Towards the Sea.
- Over Time, Material Zigzags Along the Coast.
Constructive Waves Deposit ____________.
Material.
What is Deposition?
When Material being Carried by the Seawater is Dropped on the Coast. It Occurs when Water Carrying Sediment Slows Down so that it isn’t Moving Fast Enough to Carry so much Sediment.
Waves that Deposit More Material than they Erode are Called ________________ Waves.
Constructive.
Features of Constructive Waves?
- Low.
- Long.
- Low Frequency.
Swash and Backwash of Constructive Waves?
- The Swash is Powerful and it Carries the Material Up the Coast.
- The Backwash is Weaker and it doesn’t Take a Lot of Material Back Down the Coast.
Constructive Waves ___________ Materials Such as Sand and Shingle (Gravel) Along the Coast to Form __________.
Deposit…Beaches…
What does Deposited Sediment Form?
Spits and Bars.
Formation of Spits?
- Spits Form at Sharp Bends in the Coastline.
- Longshore Drift Transports Sand and Shingle Last the Bend and Deposits it in the Sea.
- Strong Winds and Waves can Curve the End of the Spit (Forming a Recurved End).
- The Sheltered Area Behind the Spit is Protected from Waves - Lots of Material Accumulates in this Area, Meaning Plants can’t Grow there.
- Over Time, the Sheltered Area can Become a Mud Flat or a Salt Marsh.
Formation of Bars?
- A Bar is Formed when a Spit Joins Two Headlands Together.
- The Bar Cuts Off the Bay Between the Headlands from the Sea, Meaning a Lagoon can Form Behind the Bar.
