Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

New robot scouts best locations for components of undersea lab

15.08.2008
Like a deep-sea bloodhound, Sentry – the newest in an elite group of unmanned submersibles able to operate on their own in demanding and rugged environments – has helped scientists pinpoint optimal locations for two observation sites of a pioneering seafloor laboratory being planned off Washington and Oregon.

Successful selection of the two sites is a crucial step in developing an extensive sensor network above and below the seafloor on the Juan de Fuca Plate, according to John Delaney, University of Washington oceanographer and chief scientist for a two-week mapping expedition.

The network, which will be connected to land by underwater cables from locations near Warrenton and Pacific City, Ore., will help unlock secrets about such things as the ocean's ability to absorb greenhouse gases and help scientists learn how seafloor stresses cause earthquakes and tsunamis. The network is one component of a wider project being overseen by the Consortium for Ocean Leadership as part of the National Science Foundation's Oceans Observatories Initiative.

"The ocean community is on the threshold of a new era in which an ensemble of novel technologies will provide us with an increasingly powerful capacity for exploring and interacting with the global ocean system," Delaney said. "The cruise itself is an example of the coming generation of systems, where highly capable autonomous underwater vehicles like Sentry will be integral components. Today's AUVs are helping us develop the power and high-speed communications network we'll need to explore powerful and potentially dangerous processes at underwater volcanoes, within powerful tsunamis or in the wake of large storms and hurricanes."

In plans thus far, cables from two places on land will extend to five primary nodes – each about the size of a large dinner table. Like underwater extension cords, the nodes will supply power to – and communicate with – instruments, robots and smaller secondary nodes.

Choosing the right sites involved mapping and imaging in remarkable detail using sonar instruments, a towed camera and Sentry. Sentry, for instance, produces maps precise to within 1 meter, or about 3 ½ feet, as it glides about 250 feet above the seafloor. Operators program the vehicle with directions of the area to map but the vehicle is on its own when it comes to maneuvering up and down cliffs, basins and other terrain that it encounters, all while keeping a consistent distance from the bottom.

The one-of-a-kind autonomous underwater vehicle – built by Woods Hole Oceanographic Institution with funding largely from the National Science Foundation – made six dives during the July 22 to Aug. 5 expedition. It was the first time the vehicle has been used during an actual oceanographic research cruise. Sentry surveyed 212 linear kilometers of seafloor, or about 53 square kilometers, as it traced parallel lines like a lawn mower making a pattern across a yard.

"Seeing the first maps pop up on our screen was a real thrill for us, they represent the results of hard work by all members of our team," said Dana Yoerger, the lead Woods Hole Oceanographic Institution engineer of Sentry. See WHOI release about Sentry at http://www.whoi.edu/page.do?pid=7545&tid=282&cid=47407&ct=162.

The work made it possible to finalize locations for two critical sites. One is near an area 50 miles off Newport, Ore., where scientists would like to learn more about the icy methane that collects on or below the seafloor where the Juan de Fuca plate dives beneath North America.

"Most developed nations have major research efforts focused on understanding – and learning to use – these energy-rich deposits of methane," Delaney said. "Our plan is to build the infrastructure that will allow entire generations of scientists to study these deposits firsthand using robotic telepresence – no other country is there yet." The other site is about 300 miles west of Cannon Beach, Ore., and in a decidedly different environment. That one's on top of Axial Seamount, the largest active submarine volcano east of Hawaii and north of Baja California, Mexico. Earthquakes, eruptions and hydrothermal venting at Axial Seamount are representative of what happens worldwide along the 43,000 mile Mid-Ocean Ridge System.

"The key to choosing these locations is to find sites that are protected but within reach of really interesting processes that we're trying to investigate," said Deborah Kelley, UW oceanographer and co-chief scientist on the expedition. For details of the all the tools used, as well as preliminary surveying for other parts of the planned observatory, see the expedition's Web site at http://ooi.ocean.washington.edu/cruise/.

Sandra Hines | EurekAlert!
Further information:
http://www.washington.edu
http://ooi.ocean.washington.edu/cruise/
http://www.whoi.edu/page.do?pid=7545&tid=282&cid=47407&ct=162

More articles from Earth Sciences:

nachricht Global study of world's beaches shows threat to protected areas
19.07.2018 | NASA/Goddard Space Flight Center

nachricht NSF-supported researchers to present new results on hurricanes and other extreme events
19.07.2018 | National Science Foundation

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Global study of world's beaches shows threat to protected areas

19.07.2018 | Earth Sciences

New creepy, crawly search and rescue robot developed at Ben-Gurion U

19.07.2018 | Power and Electrical Engineering

Metal too 'gummy' to cut? Draw on it with a Sharpie or glue stick, science says

19.07.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>