Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

'Trapped wave' caused unexpected Dennis surge

11.10.2006
NOAA finding leads to improved Gulf Coast storm surge predictions

When Hurricane Dennis passed North Florida on July 10, 2005, it caused a 10-foot storm surge in some areas along Apalachee Bay -- about 3 to 4 feet more than forecasted-- that couldn't be explained only by the local winds that conventionally drive storm surge.

Now, scientists at Florida State University and the National Oceanic and Atmospheric Administration have found that the surge in Apalachee Bay was amplified by a "trapped wave" that originated off the southwest Florida coast. The discovery of this previously undocumented storm surge phenomenon has changed how NOAA's National Hurricane Center prepares storm surge models for the Gulf of Mexico. New modeling procedures will help improve the accuracy of storm surge forecasts for the entire Gulf coast from Florida to Texas.

Scientists Steven Morey, Mark Bourassa, Dmitry Dukhovskoy and James O'Brien of FSU's Center for Ocean Atmospheric Prediction Studies and Stephen Baig of NOAA's Tropical Prediction Center of the National Hurricane Center drew their conclusions after conducting numerical experiments with storm surge models. Their research was published in the Oct. 4 issue of the journal Geophysical Research Letters.

Hurricane Dennis formed from a tropical depression that originated near the southern Windward Islands on July 4, 2005. It strengthened as it traveled northwest through the Caribbean Sea until it made landfall in Cuba as a Category 4 hurricane. It then traveled west of the Florida Shelf, and the storm's maximum sustained winds weakened to 54 mph before it made landfall on the western Florida Panhandle.

"Winds from Dennis forced water against the southwestern Florida coast creating a bulge of high sea level from Naples to around Tampa," Morey explained. "Oceanographers know that this 'bulge' will form a long wave that, in the Northern Hemisphere, will travel as a wave with the coast to the right. Because Dennis traveled nearly parallel to the Florida Peninsula coast at the same speed as the wave, winds from Dennis amplified the wave as it traveled to Apalachee Bay."

The trapped wave then piled up on the shore along Apalachee Bay on top of the surge generated by the winds over the bay, according to O'Brien.

"To address these findings, we will use as necessary a larger geographical grid in our operational storm surge model in the Gulf of Mexico," said Baig, oceanographer and storm surge leader at NOAA's National Hurricane Center. "This will provide a more comprehensive view of a storm's potential impact in the Gulf by better accounting for the rare trapped wave effect."

This type of remotely trapped wave could play a role in future storms that follow a path similar to Hurricane Dennis or travel westward south of the Louisiana coastline toward Texas, the scientists said.

Steven Morey | EurekAlert!
Further information:
http://www.coaps.fsu.edu

More articles from Earth Sciences:

nachricht NASA examines Peru's deadly rainfall
24.03.2017 | NASA/Goddard Space Flight Center

nachricht Steep rise of the Bernese Alps
24.03.2017 | Universität Bern

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>