Coastal Management

How are sand dunes formed?

• When wind deposits sand on top of each other over time

• When waves carve out spaces for sand depositions

• When rainfall erodes at sandy areas and leaves mounds of sand

Sand dunes help prevent coastal erosion by...

• Acting as a natural barrier against waves

• Absorbing the impact of storm surge and high waves, preventing flooding

• Stopping longshore drift from occurring

• Preventing access to the beach for humans and animals

Coastal erosion can be best defined as...

• "The permanent loss of land along the shoreline"

• "A natural device which monitors coastal health over time"

• "The loss of coastlines which is directly caused by humans"

Two forms of coastal erosion involving water include...

• Hydraulic action and solution

• Attrition and solution

• Solution and abrasion

• Hydraulic action and attrition

Two forms of coastal erosion including stones and degrading rock are...

• Abrasion and attrition

• Abrasion and hydraulic action

• Solution and attrition

• Attrition and hydraulic action

Groynes are a coastal management strategy of low walls or study timber barriers which are built out into the sea. They work by...

• Trapping sand which waves have moved along the coast

• Repelling the impact of waves back into the ocean

• Reflecting the acidic solution of sea water

Which would be more expensive to implement; sea walls or sand bags?

• Sea walls

• Sand bags

Of the coastal management strategies we have looked at, which is naturally occurring?

Sand replenishment refers to what?

• Erosion of sand in a coastal environment

• Deposition of sand due to longshore drift

• Refilling of sand back into an area of coast which has suffered erosion

Sand dredging is like replenishment except the sand is coming from where?

• Another state

• Another country

• Artificial sand from a lab

• From the bottom of a body of water