Your SlideShare is downloading. ×
0
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Sec 3 NA Coastal Protection Measures
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Sec 3 NA Coastal Protection Measures

11,068

Published on

Published in: Business, Technology
1 Comment
16 Likes
Statistics
Notes
No Downloads
Views
Total Views
11,068
On Slideshare
0
From Embeds
0
Number of Embeds
4
Actions
Shares
0
Downloads
0
Comments
1
Likes
16
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Coastal Protection Measures
  • 2. Different types of engineering
    • Hard engineering
    • Soft engineering
  • 3. Hard engineering
    • Seawalls
      • Is usually made of concrete which absorbs the energy of the wave
      • Protect the coast against strong waves especially during storms
  • 4.  
  • 5.  
  • 6.  
  • 7.  
  • 8. Hard engineering
    • Breakwaters
      • Usually made of granite.
      • Creates a zone of shallow water between itself and the coast so that waves will break against it before reaching the coast.
  • 9.  
  • 10.  
  • 11.  
  • 12.  
  • 13. Hard engineering
    • Groynes
      • Is a low wall built at right angles to prevent materials from being transported away by the longshore drift.
      • This enables the transported materials to accumulate on the side of the groyne facing the longshore drift.
  • 14.  
  • 15.  
  • 16. Hard engineering
    • Gabions
      • Are used to protect river banks against erosion.
      • Similarly, these wire cages containing small rocks are used to form a wall to protect other coastal protection structures such as seawalls.
  • 17.  
  • 18.  
  • 19. Soft engineering
    • Stabilising coastal dunes
      • The dunes form as a result of the vegetation trapping and stabilising the sand.
      • The dunes extend several kilometres inland and to height of more than 100 metres.
      • Plant vegetation to trap and bind the sand together, preventing sand from being blown away.
  • 20.  
  • 21.  
  • 22. Soft engineering
    • Planting mangroves along the shore
      • Mangrove trees have prop roots or kneed roots that anchor the trees firmly in the muddy soil.
      • These roots also bind the loose soil and protect it from erosion.
  • 23.  
  • 24.  
  • 25.  
  • 26. Soft engineering
    • Beach nourishment
      • This involve adding large amounts of sand to a beach that is being eroded.
      • Longshore drift removes the sand from the beach and carries it further down the coast.
      • People will bring in sand from other areas and deposit the sand onto the beach again.
  • 27.  
  • 28.  
  • 29.  
  • 30.  
  • 31. Soft engineering
    • Encourage growth of coral reefs
      • Coral reefs are masses of rock like substance called corals growing in shallow water.
      • They protect beaches against coastal erosion by reducing the speed of the waves approaching the coast.
      • Resulting the waves losing most of their energy.
  • 32.  
  • 33.  
  • 34.  
  • 35. Coastal Protection Management Comparison of the Effectiveness of Coastal Management Protection Measures – Hard Engineering Gabions Groynes Breakwaters Seawalls Disadvantages Advantages
  • 36. Coastal Protection Management Comparison of the Effectiveness of Coastal Management Protection Measures – Hard Engineering
    • Need regular maintenance
    • Weaken wave energy
    • Reduce coastal erosion
    Gabions
    • Erosion on parts of coast not protected by groynes
    • Protect coast from high energy waves
    • Encourage build-up of beach
    Groynes
    • Erosion on parts of coast not protected by breakwaters
    • Protect coast from high energy waves
    • Encourage build-up of beach
    Breakwaters
    • Erosion may lead to collapse of seawall
    • Costly
    • Absorb shock of waves
    • Reduce erosion of shore
    Seawalls Disadvantages Advantages
  • 37. Coastal Protection Management Comparison of the Effectiveness of Coastal Management Protection Measures – Soft Engineering
    • Can affect the depth of coasts – implications for port activities/coastal transportation
    • Helps trap sediments to form islands
    • Prevents coastal erosion
    Planting of mangroves
    • Affects investment opportunities in coastal areas
    • Allows nature to take its course
    • Avoids loss of lives and properties
    Relocation properties
    • Expensive
    • Affects marine ecosystem
    • Requires constant supply of new sand
    • Improves beach quality
    • Improves storm protection
    Beach nourishment Disadvantages Advantages
  • 38. Coastal Protection Management Comparison of the Effectiveness of Coastal Management Protection Measures – Soft Engineering -
    • Reduces wave energy
    • Encourages the growth of living organisms
    • Improves fishing opportunities
    Growth of coral reefs
    • Dunes are easily eroded if vegetation is not present
    • Vegetation growing on dunes anchor sand
    • Protects coast from sea
    Stabilizing dunes Disadvantages Advantages

×