Difference between revisions of "Waves"

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(Describing 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]]
* In [http://seasteading.org/seastead.org/commented/paper/ocean.html#Waves the book] is a big section on waves.
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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]
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* 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.
* [http://seasteading.org/seastead.org/commented/paper/designs.html#Breakwater Breakwaters] in the book.
 
 
* [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)
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* [http://en.wikipedia.org/wiki/Sea_state Wikipedia Sea state] - standard classifications for wave state
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* [http://en.wikipedia.org/wiki/Beaufort_scale Beaufort scale] - scale for wind and waves
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==Describing Waves==
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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
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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
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delineate the rate at which a sea state occurs.
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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.
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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.
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Map of wave heights:
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https://static1.squarespace.com/static/57070436f699bbcfa154423d/t/583b353b725e257a97db2cfe/1480275484044/?format=750w
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==Rogue Waves==
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"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."
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From "Surviving the Storm" by Steve & Linda Dashew, page 241.
  
 
==See also==
 
==See also==
[[Wave Power]]
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* [[Wave Power]]
[[Big wave videos]]
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* [[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

WhisprWave breakwater

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
General · Waves · Sea state · Currents · Wind · Politics · Piracy · Biofouling