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How might navy sonar affect hearing of whales and other marine animals?

Date:
November 24, 2009
Source:
Office of Naval Research
Summary:
Rocket science is opening new doors to understanding how sounds associated with Navy sonar might affect the hearing of a marine mammal -- or if they hear it at all.
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Rocket science is opening new doors to understanding how sounds associated with Navy sonar might affect the hearing of a marine mammal -- or if they hear it at all. 

The same type of large industrial sized X-ray scanners that NASA uses to detect flaws in the space shuttle's behemoth solid fuel rockets is now allowing Navy scientists to peek inside the giant head of a whale. The scans are providing detailed three-dimensional replicas of a whale's hearing anatomy using a breakthrough method developed by Dr. Ted Cranford, a marine biologist sponsored by the Office of Naval Research (ONR) and the Chief of Naval Operations Environmental Readiness Division (N45).

Using a simulated model of a male beaked whale's head, Cranford's team at San Diego State University and the University of California at San Diego (UCSD) has unveiled data that suggests mid-frequency active sonar sounds are largely filtered, or "muffled," before reaching the animal's ears. The findings also suggest that higher frequencies used by whales to hunt prey are heard at amplified levels without any dampening.

"Even though these findings are promising, our next step is to reproduce the study with a similar species for which hearing tests are available, such as the bottlenose dolphin," Cranford said. "If we obtain like results, it will help to validate this new discovery."

The innovative approach integrates advanced computing, outsized X-ray CT scanners, and modern computational methods (developed by Dr. Petr Krysl at UCSD) to generate the reproductions in minute detail. The simulation, also referred to as a "finite element model" or FEM, accurately describes the interactions of sound with the whale's hearing anatomy. In addition, it forecasts and analyzes incoming sound received at the ear and provides a description of how different characteristics combine to create movement throughout the ear.

"The simulation technology is powerful because it provides a means to look at a broad range of species, from whales to fish, for which we may not otherwise be able to study hearing," said ONR program manager Dr. Michael Weise. "Virtual experiments can also provide potential for evaluating and directing mitigation efforts."

In 2009, ONR and N45 contributed $20 million for research on marine mammals and the effects of underwater sound.


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The above post is reprinted from materials provided by Office of Naval Research. Note: Materials may be edited for content and length.


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Office of Naval Research. "How might navy sonar affect hearing of whales and other marine animals?." ScienceDaily. ScienceDaily, 24 November 2009. <www.sciencedaily.com/releases/2009/11/091124113608.htm>.
Office of Naval Research. (2009, November 24). How might navy sonar affect hearing of whales and other marine animals?. ScienceDaily. Retrieved July 28, 2015 from www.sciencedaily.com/releases/2009/11/091124113608.htm
Office of Naval Research. "How might navy sonar affect hearing of whales and other marine animals?." ScienceDaily. www.sciencedaily.com/releases/2009/11/091124113608.htm (accessed July 28, 2015).

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