Limitations of the Coastal Protection Strategies

A breakwater is a man-made structure constructed for what purpose?

• To generate electricity

• To protect a coast from the effects of waves

• To facilitate fishing activities

• To enhance marine biodiversity

Which of the following is limitation or disadvantage of breakwaters?

• High construction and maintenance costs

• Environmental impact on marine life

• Increased tourism and recreational opportunities

• Enhanced protection against coastal erosion

Groynes and revetments are structures used in coastal management. What is their primary purpose?

• To prevent coastal erosion

• To enhance marine biodiversity

• To improve water quality

• To facilitate navigation

What is the major limitation or disadvantage of groynes and revetments?

• They are expensive to build and maintain.

• They enhance the natural beauty of the coastline.

• They can reduce the adverse effect of longshore drift as they can promote the accumulation of sands particles carried by long shore drift.

• They provide habitats for marine life.

Which of the following is not the disadvantages of seawalls?

• It is very effective in term of protecting and resisting the wave energy approaching the shore

• It entirely changes the nature of coastline and damage the habitats along the coast.

• It obstructs the fishermen to get access to the coastal area

• It can aggravate the backwash effects of the sea waves and cause wave erosion to other coastal areas

Which of the following is not the disadvantage of rock amours?

• It’s expensive if uniform shape of large rocks (over 2 tonnes each) is needed for the construction

• It blocks the access to the coastal area from the sea.

• It can effectively absorb the wave energy approaching the shore.

Which of the following is wrong about beach nourishment?

• It can damage the ecology (marine life) of the beach

• Beach re-nourishment at regular intervals is needed and expensive

This strategy can compensate the loss of sand brought by longshore drift and meanwhile increase the beach area for recreation. What is this strategy called?

Offshore coral reef and mangrove along the coast can effectively protect the coast against wave erosion by reducing the strength of waves approaching the coast. Which of the following statements is true?

• Coral and Mangrove planting

• Beach nourishment

They are man-made construction or engineering works – to resist or work again the coastal processes. / to prevent the wave energy reaching the shore, to dissipate wave energy somewhere. For examples:

• Beach Nourishment

• Mangrove plantation

• Landuse zoning

• Hard strategies