Podcast
Questions and Answers
How do sea walls primarily protect coastlines?
How do sea walls primarily protect coastlines?
- By creating wide beaches through trapping sediment.
- By directly blocking and reflecting wave energy. (correct)
- By gradually releasing wave energy through a network of wire cages.
- By absorbing the energy of waves with porous materials.
What is the main function of rock armour in coastal defense?
What is the main function of rock armour in coastal defense?
- To absorb and dissipate wave energy through a pile of rocks. (correct)
- To filter pollutants from the seawater.
- To create artificial cliffs that deflect wave energy.
- To act as a barrier that prevents longshore drift.
Why are groynes considered a cost-effective method of coastal protection?
Why are groynes considered a cost-effective method of coastal protection?
- Because they can be easily moved and repositioned.
- Because they require minimal maintenance after installation.
- Because they are built from recycled materials.
- Because the construction is relatively simple and inexpensive. (correct)
What is a significant disadvantage of using gabions for coastal protection?
What is a significant disadvantage of using gabions for coastal protection?
Which of the following is a consequence of groynes interrupting longshore drift?
Which of the following is a consequence of groynes interrupting longshore drift?
How does the design of a sea wall contribute to its effectiveness?
How does the design of a sea wall contribute to its effectiveness?
What is the most significant environmental impact associated with hard engineering coastal defenses?
What is the most significant environmental impact associated with hard engineering coastal defenses?
In what scenario would rock armour be preferred over a sea wall?
In what scenario would rock armour be preferred over a sea wall?
What is the main purpose of using boulders and rocks in both rock armour and gabions?
What is the main purpose of using boulders and rocks in both rock armour and gabions?
Which long-term effect is most likely to result from the installation of groynes along a coastline?
Which long-term effect is most likely to result from the installation of groynes along a coastline?
What material property is most important for the rocks used in rock armour?
What material property is most important for the rocks used in rock armour?
How does the effectiveness of gabions change over time?
How does the effectiveness of gabions change over time?
What is a key difference between how sea walls and rock armour dissipate wave energy?
What is a key difference between how sea walls and rock armour dissipate wave energy?
If a coastal community wants to protect a specific area from flooding and also widen its beach, which combination of hard engineering strategies would be most effective?
If a coastal community wants to protect a specific area from flooding and also widen its beach, which combination of hard engineering strategies would be most effective?
What factor MOST determines the long-term success and sustainability of hard engineering coastal defenses?
What factor MOST determines the long-term success and sustainability of hard engineering coastal defenses?
Which of the following hard engineering methods isLEAST likely to be used on a natural, undeveloped coastline?
Which of the following hard engineering methods isLEAST likely to be used on a natural, undeveloped coastline?
What is a potential negative consequence of installing groynes for coastal protection?
What is a potential negative consequence of installing groynes for coastal protection?
Considering the long-term effects, which hard engineering approach requires the MOST continuous maintenance to remain effective?
Considering the long-term effects, which hard engineering approach requires the MOST continuous maintenance to remain effective?
Which strategy would be LEAST effective in an area experiencing significant sea-level rise?
Which strategy would be LEAST effective in an area experiencing significant sea-level rise?
A coastal manager has a limited budget and needs to protect a small, localized area from increasing storm surges. Which hard engineering method would be the MOST suitable initial choice?
A coastal manager has a limited budget and needs to protect a small, localized area from increasing storm surges. Which hard engineering method would be the MOST suitable initial choice?
Flashcards
Hard engineering
Hard engineering
Man-made structures used to protect coastlines from erosion and flooding.
Sea wall
Sea wall
A wall constructed to block waves and protect the coastline from erosion and flooding.
Rock armour
Rock armour
Piles of large rocks or boulders placed along the coast to absorb wave energy.
Gabions
Gabions
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Groynes
Groynes
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Longshore drift
Longshore drift
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Study Notes
- Hard engineering strategies employ man-made constructions to shield coastlines from erosion and destructive waves.
- They prevent sea or river flooding.
Sea Wall
- Sea walls are constructed from materials that block waves.
- Durable materials like hard rock or concrete extend their lifespan.
- Their design can deflect wave energy back to sea.
- They protect promenades from flooding and minimize coastal erosion.
- Sea walls are expensive to build along an entire coastline.
Rock Armour
- Rock armour consists of piles of rocks or boulders.
- The rocks dissipate wave pressure and energy.
- Though large waves can displace boulders, it is a cost-effective method of coastal protection.
Gabions
- Gabions are wire cages filled with rocks.
- They absorb wave pressure and energy, reducing erosion.
- The wire cages corrode over time.
Groynes
- Groynes are fences positioned at 90 degrees to the coast.
- They obstruct longshore drift by trapping material.
- They result in wider beaches, enhancing coastline protection against erosion and floods.
- Building fences is inexpensive.
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