Difference between revisions of "Waves"
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[[Image:Whisprwave breakwater.jpg|thumb|The Palace of Westminster|200px|right|WhisprWave breakwater]] | [[Image:Whisprwave breakwater.jpg|thumb|The Palace of Westminster|200px|right|WhisprWave breakwater]] | ||
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+ | * Excellent resource: [http://www.wikiwaves.org/index.php/Main_Page WikiWaves] | ||
* Some background on [http://en.wikipedia.org/wiki/Ocean_surface_wave ocean surface waves] and also [http://www.seafriends.org.nz/oceano/waves.htm waves for oceanographers] | * Some background on [http://en.wikipedia.org/wiki/Ocean_surface_wave ocean surface waves] and also [http://www.seafriends.org.nz/oceano/waves.htm waves for oceanographers] | ||
+ | * More background [http://www.seafriends.org.nz/oceano/waves.htm here]. | ||
* A lot of [http://www.artificialreefs.org/ScientificReports/Wave%20reduction.htm math on breakwaters] at artificialreefs.org. | * A lot of [http://www.artificialreefs.org/ScientificReports/Wave%20reduction.htm math on breakwaters] at artificialreefs.org. | ||
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* [http://www.whisprwave.com/floating.htm Floating breakwaters] by WhisprWave. | * [http://www.whisprwave.com/floating.htm Floating breakwaters] by WhisprWave. | ||
* [[Ecoboot|Clickets]] | * [[Ecoboot|Clickets]] | ||
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* [http://www.freepatentsonline.com/3953977.pdf A moored device (Patent)] | * [http://www.freepatentsonline.com/3953977.pdf A moored device (Patent)] | ||
* A lot more patents at [http://www.freepatentsonline.com FreePatentsOnline] (free registration required to see pictures) | * A lot more patents at [http://www.freepatentsonline.com FreePatentsOnline] (free registration required to see pictures) | ||
+ | * [http://en.wikipedia.org/wiki/Sea_state Wikipedia Sea state] - standard classifications for wave state | ||
+ | * [http://en.wikipedia.org/wiki/Beaufort_scale Beaufort scale] - scale for wind and waves | ||
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+ | ==Describing Waves== | ||
+ | |||
+ | During the service life of an offshore structure, it will experience a huge number of waves, from very small wavelets to possibly giant waves. A practical way to describe these unceasingly changing waves | ||
+ | is to divide them into various categories (sea states), and use short-term wave statistics to depict each sea state and long-term wave statistics, usually in the form of a wave scatter diagram and rosette, to | ||
+ | delineate the rate at which a sea state occurs. | ||
+ | |||
+ | In a similar way, there are two levels in the description of wave directionality, i.e., wave directional spectrum or wave spreading for short-term, and wave rosette for long-term, respectively. | ||
+ | |||
+ | See Section 3 of [https://ww2.eagle.org/content/dam/eagle/rules-and-guides/archives/offshore/104_sfaforfloatingoffshorestructures/pub104_offshoresfa_guide.pdf ABS GUIDANCE NOTES ON SPECTRAL-BASED FATIGUE ANALYSIS FOR FLOATING OFFSHORE STRUCTURES . 2005] for further discussion of Wave measurement. | ||
+ | |||
+ | Map of wave heights: | ||
+ | https://static1.squarespace.com/static/57070436f699bbcfa154423d/t/583b353b725e257a97db2cfe/1480275484044/?format=750w | ||
+ | |||
+ | ==Rogue Waves== | ||
+ | |||
+ | "There really is no such thing as a rogue wave. These larger than normal seas are the result of two wave trains coinciding at just the right moment for their energy to combine. When this happens the higher-than-normal crest is exposed to more wind force and absorbs additional energy. And if the wave happens to be unstable and breaks - because the rotating particles within the wave can no longer make it over the top - there will be a large mass of water falling downhill." | ||
+ | From "Surviving the Storm" by Steve & Linda Dashew, page 241. | ||
==See also== | ==See also== | ||
* [[Wave Power]] | * [[Wave Power]] | ||
* [[Big wave videos]] | * [[Big wave videos]] | ||
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+ | |||
+ | [[Category:Engineering Data]] | ||
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<gallery widths=400 heights=400 caption="Rogue waves"> | <gallery widths=400 heights=400 caption="Rogue waves"> | ||
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Image:Rogue wave2.jpg | Image:Rogue wave2.jpg | ||
</gallery> | </gallery> | ||
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+ | {{Ocean Environment}} |
Revision as of 23:35, 6 November 2018
- Excellent resource: WikiWaves
- Some background on ocean surface waves and also waves for oceanographers
- More background here.
- A lot of math on breakwaters at artificialreefs.org.
- Floating breakwaters by WhisprWave.
- Clickets
- Opening and closing tubes
- A moored device (Patent)
- A lot more patents at FreePatentsOnline (free registration required to see pictures)
- Wikipedia Sea state - standard classifications for wave state
- Beaufort scale - scale for wind and waves
Describing Waves
During the service life of an offshore structure, it will experience a huge number of waves, from very small wavelets to possibly giant waves. A practical way to describe these unceasingly changing waves
is to divide them into various categories (sea states), and use short-term wave statistics to depict each sea state and long-term wave statistics, usually in the form of a wave scatter diagram and rosette, to delineate the rate at which a sea state occurs.
In a similar way, there are two levels in the description of wave directionality, i.e., wave directional spectrum or wave spreading for short-term, and wave rosette for long-term, respectively.
See Section 3 of ABS GUIDANCE NOTES ON SPECTRAL-BASED FATIGUE ANALYSIS FOR FLOATING OFFSHORE STRUCTURES . 2005 for further discussion of Wave measurement.
Map of wave heights: https://static1.squarespace.com/static/57070436f699bbcfa154423d/t/583b353b725e257a97db2cfe/1480275484044/?format=750w
Rogue Waves
"There really is no such thing as a rogue wave. These larger than normal seas are the result of two wave trains coinciding at just the right moment for their energy to combine. When this happens the higher-than-normal crest is exposed to more wind force and absorbs additional energy. And if the wave happens to be unstable and breaks - because the rotating particles within the wave can no longer make it over the top - there will be a large mass of water falling downhill."
From "Surviving the Storm" by Steve & Linda Dashew, page 241.
See also
Ocean Environment |
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General · Waves · Sea state · Currents · Wind · Politics · Piracy · Biofouling |