1 / 21

Artificial Reef Design for Surfing

Artificial Reef Design for Surfing. By: Spicer Bak, M.S. Stevens Institute of Technology This material is based upon work supported by the National Science Foundation under Grant No.. NSF DGE-0742462. Why do this? . Rising Sea Levels/Wave heights Growing Conflict with Surfer

odell
Télécharger la présentation

Artificial Reef Design for Surfing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Artificial Reef Design for Surfing By: Spicer Bak, M.S. Stevens Institute of Technology This material is based upon work supported by the National Science Foundation under Grant No.. NSF DGE-0742462

  2. Why do this? • Rising Sea Levels/Wave heights • Growing Conflict with Surfer Groups and local Government Long Branch, NJ - October 2006 ASBPA National Conference

  3. Beach Protection • Waves are a type of energy • Waves = energy • Energy moves sand • Beach gets narrower • 2 basic causes of erosion • Longshore Sediment transport • Cross-shore erosion • Current popular protection • Groynes - Long-shore • Breakwaters/seawalls • Cross-shore

  4. Groynes - Long-shore sediment transport protection • Advantage: • Keeps sand • Encourages sea life • Disadvantage • Eyesore - not pretty • Need a field to adequately protect

  5. http://changingcoastline.com/dunes-edge/beach-restoration/hard-engineered-solutions/http://changingcoastline.com/dunes-edge/beach-restoration/hard-engineered-solutions/

  6. Break waters & sea walls • Seawall • Wall at edge of water • Stops wave energy • Breakwater • Parallel to shore • Dissipates waves Galveston, Texas

  7. Science Of Surfing • Peel Angle • Velocity • Wave Classification • Vortex Ratio • Surf Similarity Parameter

  8. Peel Angle • Used to classify the wave • Surfer Velocity

  9. Peel Angle

  10. Hutt, Black and Mead (2001) Classification of Waves BEGINNER INTERMEDIATE ADVANCED/EXPERT

  11. Vortex Ratio Vortex ratio (Y) = Vortex length to width ratio Wave parameters used for curve fitting; vortex length (l), vortex width (w), angle (θ), and wave height (H), orthogonal seabed gradient (X’) Mead and Black (2001)

  12. Surf Similarity Parameter Surging/Collapsing Plunging Spilling

  13. Example Classifications Mead and Black (2001)

  14. Reefs • Advantages • Out of sight • Design to protect against long- shore/cross-shore • Provides: • Capability for design for surf • Adds marine life habitat • Sheltered swimming • Diving • Comparable Cost • Disadvantages • Construction difficult • Time consuming • Still an emerging technology • Mostly proprietary (as of right now)

  15. Refraction - Energy • Wave straightens out • Snell’s Law (q – measured w.r.t. shore normal) • E=1/8  * g * H2

  16. Unprotected

  17. Coastal protection

  18. Design • Giant Sand bags • Placed then filled • V - Shaped pattern

  19. Narrow Neck - Aus • Both Right and left • Beginners wave on inside

  20. ASR • design overview • india goes off

More Related