2.2. Coastal Processes

• Erosion is the movement of sediment along or across the coast.

  False
• Deposition is the accumulation of sediment in specific locations to form new landforms.


  True
• Match the type of erosion with its description:

  Hydraulic Action ↔️ Force of waves dislodging material

  Abrasion ↔️ Wearing down coast by sediment

  Attrition ↔️ Collision of sediment particles

  Corrosion ↔️ Dissolving of coastal material
• Corrosion is the chemical reaction between seawater and coastal material, dissolving it over time.


  True
• Wave erosion occurs through hydraulic action and abrasion
• Coastal processes are the physical and chemical actions that shape coastlines
• Transportation refers to the movement of sediment by various means along or across the coast
• Steps in wave transportation of sediment

  1️⃣ Waves carry sediment via longshore drift

  2️⃣ Waves deposit sediment to create new landforms
• Attrition is the collision and rubbing together of sediment particles, making them smaller and smoother
• Constructive waves are low frequency, low amplitude and deposit
• Transportation processes move sediment along coastlines using mechanisms such as traction, saltation, suspension, and solution
• Longshore drift carries sediment along the coast due to the angle of wave approach.


  True
• Longshore drift is a key process in coastal deposition, moving sediment along the coast due to the angle of wave approach
• What type of waves deposit sediment on the coastline?

  Constructive waves
• What are the three main categories of coastal processes?

  Erosion, transportation, deposition
• Destructive waves have high frequency and high amplitude

  True
• The force of waves crashing against the coast is called hydraulic action.
• Match the transportation process with its description:

  Traction ↔️ Large particles roll along the seabed

  Saltation ↔️ Smaller particles bounce along the seabed

  Suspension ↔️ Fine particles are carried within the water

  Solution ↔️ Soluble minerals are dissolved in seawater
• Wave erosion occurs through hydraulic action and abrasion.


  True
• Abrasion involves the wearing down of the coast by sediment carried in waves
• Wave action is a crucial force in shaping coastlines through erosion, transportation, and deposition
• Longshore drift is the primary mechanism for wave transportation of sediment along the coast.


  True
• Saltation refers to the bouncing of smaller particles along the seabed
• Constructive waves deposit sediment along the coastline due to their low frequency and low amplitude
• Deposition is the accumulation of sediment to form new coastal landforms
• Match the deposition mechanism with its description:

  Offshore Bars ↔️ Underwater ridges formed by sediment

  Spits ↔️ Elongated landforms created by deposition
• What is the role of wave action in coastal processes?

  Erosion, transportation, deposition
• What are the four main types of erosion that shape coastlines?

  Hydraulic action, abrasion, attrition, corrosion
• What facilitates sediment transportation along coastlines?

  Wave action and longshore drift
• What are the two coastal processes that shape coastlines alongside waves?

  Tides and currents
• Traction involves the rolling of large, heavy particles along the seabed
• Deposition occurs when sediment accumulates to form new coastal landforms
• What is the role of longshore drift in coastal transportation?

  Carries sediment along coast
• Longshore drift is caused by waves approaching the coast at an angle


  True
• The movement of sediment by various means along the coast is called transportation
• Match the wave action with its description:

  Erosion ↔️ Waves wear away land through hydraulic action

  Transportation ↔️ Waves carry sediment via longshore drift

  Deposition ↔️ Waves deposit sediment to create new landforms
• Abrasion is the wearing down of the coast by sediment carried in waves


  True
• Longshore drift moves sediment along the coast in a zig-zag pattern.
• Tidal currents transport sediment through longshore drift


  True