. 24/7 Space News .
WATER WORLD
Study finds massive rogue waves aren't as rare as previously thought
by Staff Writers
Miami FL (SPX) Mar 09, 2017


This is a rogue wave photo taken from the deck of the RV Cape Henlopen in the western North Atlantic during the Atlantic Remote Sensing Land/Ocean Experiment (ARSLOE) The crest of the rogue propogates from the right to left. Credit: H. Mitsuyasu Inset figure: Surface elevation of groups in each period band displayed on axes of time and logarithm of period in seconds. All 32 periods are displayed and their sum (divided by 20) is graphed along the time axis. The Andrea crest is at 862 s. Credit: Donelan, et.al. Image courtesy H. Mitsuyasu Graph: Donelan, et.al.

University of Miami Rosenstiel School of Marine and Atmospheric Science scientist Mark Donelan and his Norwegian Meteorological Institute colleague captured new information about extreme waves, as one of the steepest ever recorded passed by the North Sea Ekofisk platforms in the early morning hours of Nov. 9 2007.

Within the first hour of the day, the Andrea wave passed by a four-point square array of ocean sensors designed by the researchers to measure the wavelength, direction, amplitude and frequency of waves at the ocean surface.

Using the information from the wave set--a total of 13,535 individual waves--collected by the system installed on a bridge between two offshore platforms, the researchers took the wave apart to examine how the components came together to produce such a steep wave.

The data from the 100-meter wide "wall of water" moving at 40 miles per hour showed that Andrea may have reached heights greater than the recorded height of 49 feet above mean sea level. They also found that rogue waves are not rare as previously thought and occur roughly twice daily at any given location in a storm. The findings showed that the steeper the waves are, the less frequent their occurrence, which is about every three weeks at any location for the steepest rogues.

The Andrea crest height was 1.63 times the significant height (average height of the one third highest waves). Optimal focusing of the Andrea wave showed that the crest could have been even higher and limited by breaking at 1.7 times the significant height. This establishes the greatest height rogues can reach for any given (or forecasted) significant height.

"Rogue waves are known to have caused loss of life as well as damage to ships and offshore structures," said Mark Donelan, professor emeritus of ocean sciences at the UM Rosenstiel School. "Our results, while representing the worst-case rogue wave forecast, are new knowledge important for the design and safe operations for ships and platforms at sea."

The study, titled "The Making of the Andrea Wave and other Rogues," was published in the March 8 issue of the journal Scientific Reports. The authors include: Donelan and Anne-Karin Magnusson from the Norwegian Meteorological Institute. The work was partly performed within the ExWaMar project (ID 256466/O80) funded by the Norwegian Research Council. ConocoPhillips provided the wave data.

Research paper

WATER WORLD
Massive Hong Kong shark fin seizure as ban flouted
Hong Kong (AFP) March 7, 2017
Hong Kong authorities have seized more than a tonne of shark fins as activists warn traders are sneaking the sought-after delicacy into the city by mislabelling shipments to get around bans by major transporters. The city is one of the world's biggest markets for shark fin - often served as a soup at expensive Chinese banquets - but it prohibits the trade in products taken from endangered ... read more

Related Links
University of Miami Rosenstiel School of Marine and Atmospheric Science
Water News - Science, Technology and Politics


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only


Comment on this article using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

WATER WORLD
Orion spacecraft achieves key safety milestone

The NASA Imager Dentists Use Daily

Marshall shakes, packs, ships and tracks NASA payloads

NASA and SpaceX gives ASU a competitive edge in technological innovation

WATER WORLD
SpaceX says it will fly civilians to the moon next year

Moon tourists risk rough ride, experts say

Flight Hardware for NASA's Space Launch System on Its Way to Cape

Spacex To Send Privately Crewed Dragon Spacecraft Beyond The Moon Next Year

WATER WORLD
Humans May Quickly Evolve on Mars, Biologist Claims

NASA Orbiter Steers Clear of Mars Moon Phobos

Remnants of a mega-flood on Mars

Science checkout continues for ExoMars orbiter

WATER WORLD
Thinking Big: China Hopes to Conduct 2nd Mission to Mars by 2030

China to Conduct Test Flight of CZ-8 Carrier Rocket by 2018

China to launch first high-throughput communications satellite in April

Chinese cargo spacecraft set for liftoff in April

WATER WORLD
OneWeb, Intelsat merge to advance satellite internet

GomSpace to supply satellites for Sky and Space Global constellation

Kacific places order with Boeing for a high throughput satellite

ESA affirms Open Access policy for images, videos and data

WATER WORLD
Coffee-ring effect leads to crystallization control

3-D printing with plants

Researchers remotely control sequence in which 2-D sheets fold into 3-D structures

Scientists demonstrate improved particle warning to protect astronauts

WATER WORLD
Faraway Planet Systems Are Shaped Like the Solar System

Biochemical 'fossil' shows how life may have emerged without phosphate

The missing link in how planets form

Volcanic hydrogen spurs chances of finding exoplanet life

WATER WORLD
Juno to remain in current orbit at Jupiter

Europa Flyby Mission Moves into Design Phase

NASA receives science report on Europa lander concept

New Horizons Refines Course for Next Flyby









The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us.