U.S. Navy: Marine Mammal Project Breaks New Ground

Posted by Greg Trauthwein
Tuesday, July 08, 2014
Dolphins jump out of the water near the Military Sealift Command dry cargo and ammunition ship USNS Alan Shepard (T-AKE-3) during an underway replenishment with the guided-missile destroyer USS Stockdale (DDG 106), not pictured. (U.S. Navy photo by Mass Communication Specialist 2nd Class David Hooper/Released)

The U.S. Navy said that a newly released scientific report demonstrates the viability of a new method to estimate received sound levels during real scenarios and analyzes movements of satellite-tagged individuals of three species of marine mammals exposed to Navy mid-frequency active sonar around Kauai's Pacific Missile Range Facility (PMRF).

"This is exciting news in several ways, not least of which is the promise this new integrated approach holds for learning how sonar affects marine mammals," said Julie Rivers, natural and marine resources program manager for the U.S. Pacific Fleet, which funded the study as part of its Marine Mammal Monitoring Program.

The report is co-authored by Robin Baird and Daniel Webster of Cascadia Research, Brandon Southall of Southall Environmental Associates, and Stephen Martin of the U.S. Navy. Morgan Richie, the Navy technical representative at Naval Facilities Engineering Command Pacific, provided technical oversight for the project.

On five occasions preceding Navy training events the researchers tagged a total of 23 marine mammals. The data from the satellite tags enabled them to track points along the animals' path and, in some cases, due to more sophisticated tags, their dive movements. The range facility's hydrophones, on the ocean floor northwest of Kauai, were used to record data on the actual levels of sound energy from sonar transmissions. That data enabled the scientists to use mathematical modeling to produce estimates of the range of sound levels to which some of the animals were exposed and to assess their responses.

Some tags didn't provide enough information, as often happens, and many of the tagged animals were not on or near the range during the brief periods when sonar was being used. Nonetheless, received sound levels were compiled and movements tracked for four animals: two rough-toothed dolphins, a bottle-nose dolphin and a short-finned pilot whale.

The researchers found that the bottlenose dolphin showed no large-scale movements out of the area during sonar exposures, and a short-finned pilot whale actually moved toward areas of higher sonar levels during the third day of a 3-day period of regular mid-frequency active sonar use. While the data from the rough-toothed dolphins are more limited than those for the bottlenose dolphin and the short-finned pilot whale, results are similar in that the animals did not make broad scale movement into areas where received sound levels would have been lower.


The report is available at http://www.cascadiaresearch.org/hawaii/Bairdetal2014_PMRFexposure.pdf

 

(Source: From U.S. Pacific Fleet Public Affairs)
 

Maritime Reporter September 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Navy

Mount Whitney Departs Batumi, Georgia

The U.S. 6th Fleet command and control ship USS Mount Whitney (LCC 20) departed Batumi, Georgia, Oct. 18 after completing a successful port visit. While in Batumi,

USS Constitution Not to Set Sail Until 2018

The crew of USS Constitution embarked on their final Boston Harbor underway demonstration aboard Old Ironsides this year, Oct. 17. Constitution set out into

US Navy to Christen Littoral Combat Ship Detroit

The Navy will christen littoral combat ship (LCS) Detroit, on Oct. 18 during a ceremony at Marinette Marine Corporation shipyard in Marinette, Wisconsin. Secretary of the Navy Ray Mabus,

Education/Training

USS Constitution Not to Set Sail Until 2018

The crew of USS Constitution embarked on their final Boston Harbor underway demonstration aboard Old Ironsides this year, Oct. 17. Constitution set out into

Much Activity During Danish Maritime Days

Danish Maritime Days was well visited, and there were many participants and great enthusiasm at the more than 50 events. Attendance at the many events tells that the maritime days were successful.

Open Ship a Success

Amaliekajen was buzzing with life during Culture Night, when the Danish Maritime Authority’s vessel Poul Løwenørn lowered the gangway and invited everyone interested on board.

Communication

Much Activity During Danish Maritime Days

Danish Maritime Days was well visited, and there were many participants and great enthusiasm at the more than 50 events. Attendance at the many events tells that the maritime days were successful.

First Indian Elected on WISTA Board

At the 34th WISTA International AGM & Conference held in Limassol, Cyprus, Sanjam Sahi Gupta, President of WISTA India was elected to the board of WISTA International.

Mariners Urged to Prepare for Storm ANA

The public is advised to use extreme caution and prepare for the onset of heavy weather expected to generate extreme sea conditions, storm surge and high surf

Underwater Engineering

Boskalis Consortium Wins Suez Canal Expansion Contract

A consortium consisting of Royal Boskalis Westminster N.V. (Boskalis), Van Oord, NMDC (Abu Dhabi) and Jan de Nul (Belgium) has acquired a contract from the Suez

Hydroid Wins Gold at MassEcon Impact Awards

Hydroid, Inc., a subsidiary of Kongsberg Maritime and a leading manufacturer of autonomous underwater vehicles (AUVs), today announced that it has been named

Mærsk Deliverer's Contract extended

Cabinda Gulf Oil Company Limited, a Chevron subsidiary in Angola, has extended the current contract for the ultra deepwater semi-submersible Mærsk Deliverer expiring in June 2015 by two years.

 
 
Maritime Contracts Maritime Security Pod Propulsion Port Authority Salvage Ship Electronics Ship Repair Ship Simulators Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.4266 sec (2 req/sec)