Difference between revisions of "Waves"
(→Rogue Waves) |
(→Rogue Waves) |
||
| Line 27: | Line 27: | ||
==Rogue Waves== | ==Rogue Waves== | ||
| + | |||
| + | Rogue waves are a topic of major study due to the damage they cause to ships, platforms, etc. Recent research finds new ways to model and possibly predict them as described in a Quanta Magazine article from February 2020 titled [https://www.quantamagazine.org/the-grand-unified-theory-of-rogue-waves-20200205/ "The Grand Unified Theory of Rogue Waves"]. The article summarizes both Linear Addition and Nonlinear Focusing theories and describes a new way to combine both into a new theory. | ||
"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." | "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. | From "Surviving the Storm" by Steve & Linda Dashew, page 241. | ||
| − | |||
| − | |||
==See also== | ==See also== | ||
Revision as of 06:20, 9 January 2021
- 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
Rogue waves are a topic of major study due to the damage they cause to ships, platforms, etc. Recent research finds new ways to model and possibly predict them as described in a Quanta Magazine article from February 2020 titled "The Grand Unified Theory of Rogue Waves". The article summarizes both Linear Addition and Nonlinear Focusing theories and describes a new way to combine both into a new theory.
"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
- Rogue waves
| Ocean Environment |
|---|
| General · Waves · Sea state · Currents · Wind · Politics · Piracy · Biofouling |
