Coastal Erosion and Management Concepts

The video discusses the natural processes of erosion and accretion on sandy beaches, influenced by weather and sea levels. Human activities like urbanization and mining exacerbate erosion. Various management strategies, such as beach renourishment, groynes, and seawalls, are explored, highlighting their benefits and drawbacks. Alternative methods like gabion baskets and breakwaters are considered, though they have limitations. New approaches, including managed retreat and dune preservation, are emphasized for sustainable coastal management.

What natural event is most likely to cause short-term erosion on sandy beaches?

• Rising sea levels

• Tropical cyclone

• Calm weather

• Falling sea levels

Which human activity is NOT mentioned as a cause of coastal erosion?

• Mining

• Damming of rivers

• Agriculture

• Tourism development

What is the main drawback of beach renourishment?

• It prevents natural sand movement

• It does not affect the environment

• It requires ongoing funding

• It is a permanent solution

What is the purpose of constructing groynes?

• To trap sand transported by longshore drift

• To prevent offshore sand movement

• To reflect waves back into the sea

• To create surfable waves

What is a major disadvantage of seawalls?

• They increase the volume of sediment reaching the coast

• They enhance the natural look of the beach

• They require ongoing maintenance

• They are inexpensive

What is a managed retreat in coastal management?

• Building seawalls

• Damming rivers

• Buying and removing coastal properties

• Constructing groynes

What is the main reason councils place large rocks in gabion baskets on the beach?

• To enhance tourism

• To protect the beach from erosion

• To create surfable waves

• To increase sediment volume

What is the downside of offshore breakwaters?

• They are inexpensive

• They are supported by surfing communities

• They require many large boulders

• They enhance wave energy

Why is vegetation important for stabilizing sand dunes?

• It enhances wave energy

• It allows sand to move freely

• It prevents the formation of blowouts

• It destroys the natural barrier to wave erosion

What human activity threatens the vegetation cover of coastal dunes?

• Fishing

• Swimming

• Walking

• Boating