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PIER 4 CONDOMINUMS  Dock and Wave Attenuator replacement proposal Presented by  Bellingham Marine June 29 th . 2005
Existing Conditions at Pier 4 Condominiums:
What’s the COST of a Wave Attenuator? Wave Attenuators are the most site specific designed structures in a marina. Can’t y...
Different shapes and mass;
Different Drafts
Different Widths.
How do I know what size and shape attenuator I need? <ul><li>Determine Design Wave relevant to YOUR site. </li></ul>Wind G...
How does God make waves? WIND!
Wind blows, creating friction on the surface of a body of water.
What Factors Create and Effect  Wind Generated Waves ? Wind Duration Wind Speed Fetch Water Depth
Fetch Fetch  (n)  : a) The distance over which a wind blows.  b) The distance traveled by waves with no obstructions
Wind Speed – The average wind velocity over a 3 second gust. Wind Duration – The length of time the wind blows in minutes ...
How does Man make waves? BOAT WAKES!
Boat Wakes:   Under certain conditions the prevailing cause of waves incident to a facility could be boat wakes.  They are...
Factors Used to Determine Vessel Wake Size <ul><li>Boat Length </li></ul>Boat Displacement Boat Speed  Boat Hull Shape Cha...
 
     The right size and configuration of a attenuator will create a calm basin for ...
 
 
 
     
    = =
           ...
...
 
 ”   “...
 
 
 
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Wave Attenuation

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Wave Attenuation

  1. 1. PIER 4 CONDOMINUMS Dock and Wave Attenuator replacement proposal Presented by Bellingham Marine June 29 th . 2005
  2. 2. Existing Conditions at Pier 4 Condominiums:
  3. 3. What’s the COST of a Wave Attenuator? Wave Attenuators are the most site specific designed structures in a marina. Can’t you give me a SQUARE FOOT NUMBER?
  4. 4. Different shapes and mass;
  5. 5. Different Drafts
  6. 6. Different Widths.
  7. 7. How do I know what size and shape attenuator I need? <ul><li>Determine Design Wave relevant to YOUR site. </li></ul>Wind Generated Waves Wake Generated Waves
  8. 8. How does God make waves? WIND!
  9. 9. Wind blows, creating friction on the surface of a body of water.
  10. 10. What Factors Create and Effect Wind Generated Waves ? Wind Duration Wind Speed Fetch Water Depth
  11. 11. Fetch Fetch (n) : a) The distance over which a wind blows. b) The distance traveled by waves with no obstructions
  12. 12. Wind Speed – The average wind velocity over a 3 second gust. Wind Duration – The length of time the wind blows in minutes or hours. Water Depth – The depth of the water during the wind event.
  13. 13. How does Man make waves? BOAT WAKES!
  14. 14. Boat Wakes: Under certain conditions the prevailing cause of waves incident to a facility could be boat wakes. They are more frequent than extreme wave events and will lead to structural deterioration by cyclic fatigue.
  15. 15. Factors Used to Determine Vessel Wake Size <ul><li>Boat Length </li></ul>Boat Displacement Boat Speed Boat Hull Shape Channel Distance to Site
  16. 17.      The right size and configuration of a attenuator will create a calm basin for this specific site.
  17. 21.      
  18. 22.     = =
  19. 23.             √  ≈    
  20. 24.  .    
  21. 26.  ”   “”  WAVE TRANSMISSION TABLE GIVEN WAVE PERIOD AND ATTENUATOR WIDTHS PERIOD LENGTH WIDTH 8 9 10 11 12 3.5 63 0.13 0.14 0.16 0.18 0.19 3.25 54 0.15 0.17 0.18 0.20 0.22 3 46 0.17 0.20 0.22 0.24 0.26 2.75 39 0.21 0.23 0.26 0.28 0.31 2.5 32 0.25 0.28 0.31 0.34 0.38 So for Hs = 3.0 a s shown in the Wave Tank example; KT will as shown below PERIOD LENGTH WIDTH 8 9 10 11 12 3.5 63 0.55 0.45 0.42 0.40 0.38 3.25 54 0.50 0.41 0.40 0.38 0.34 3 46 0.41 0.38 0.34 0.31 0.30 2.75 39 0.36 0.32 0.30 0.29 0.28 2.5 32 0.31 0.29 0.28 0.27 0.28 So for Hs = 3.0 as shown in Wave Tank example; Hs = 3.0 HT will as shown below PERIOD LENGTH WIDTH 8 9 10 11 12 3.5 63 1.65 1.35 1.26 1.20 1.14 3.25 54 1.50 1.23 1.20 1.14 1.02 3 46 1.23 1.14 1.02 0.93 0.90 2.75 39 1.08 0.96 0.90 0.87 0.84

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