Feeds

Satellites track freak waves to Reunion

Working on an early warning system

Build a business case: developing custom apps

The freak waves that smashed into Reunion Island last week were tracked by satellite as they raced across the Indian Ocean.

As many as six people are reported to be missing in the region after the waves demolished several piers in the port of Saint Pierre. Two of the missing are coastguards whose boat was capsized as they searched for fishermen who had been caught in the storm swell.

Image credit: ESA, IFREMER - BOOST Technologies

Satellite data from the European Space Agency (ESA) reveals that the swell, which reached as high as 11 metres, originated in a storm off the coast of South Africa, several days earlier.

Dr Bertrand Chapron of IFREMER, the French Research Institute for Exploitation of the Sea, tracked the swell using ESA's Synthetic Aperture Radar (SAR) instrument aboard the Envisat environmental observation satellite.

The instrument can track the so-called wave period. This measurement of the gap between wave peaks is indicative of the size of the wave - the longer period suggesting a larger wave, triggered by a more intense and extreme weather system.

SAR can spot waves with periods of between 12 and 25 seconds, the scientists said, and the wave that hit Reunion had a period of 19 seconds.

Chapron commented: "Swells are still surprise factors, which can unfortunately be deadly. The SAR Wave Mode product allows us to locate and systematically track swells globally. In the near future we anticipate using SAR wave data to predict their arrival time and intensity."

His colleague, Dr Fabrice Collard of France's BOOST Technologies, explained that although the swell was expected to hit Reunion, no one had predicted it would be so large. "[The waves] were predicted to be only a couple of metres," he said.

More from the ESA site here.®

Next gen security for virtualised datacentres

More from The Register

next story
Boffins attempt to prove the UNIVERSE IS JUST A HOLOGRAM
Is this the real life? Is this just fantasy?
China building SUPERSONIC SUBMARINE that travels in a BUBBLE
Shanghai to San Fran in two hours would be a trick, though
Our LOHAN spaceplane ballocket Kickstarter climbs through £8000
Through 25 per cent but more is needed: Get your UNIQUE rewards!
CRR-CRRRK, beep, beep: Mars space truck backs out of slippery sand trap
Curiosity finds new drilling target after course correction
SpaceX prototype rocket EXPLODES over Texas. 'Tricky' biz, says Elon Musk
No injuries or near injuries. Flight stayed in designated area
Galileo, Galileo! Galileo, Galileo! Galileo fit to go. Magnifico
I'm just a poor boy, nobody loves me. But at least I can find my way with ESA GPS by 2017
Astronomers scramble for obs on new comet
Amateur gets fifth confirmed discovery
prev story

Whitepapers

A new approach to endpoint data protection
What is the best way to ensure comprehensive visibility, management, and control of information on both company-owned and employee-owned devices?
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Maximize storage efficiency across the enterprise
The HP StoreOnce backup solution offers highly flexible, centrally managed, and highly efficient data protection for any enterprise.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Next gen security for virtualised datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.