Sound Levels and Mammal Mitigation

The effect of mid-frequency sonar on marine mammals is a controversial topic. This was originally posted on a Navy web site. Comparing Mid-Frequency Active Sonar to a Saturn V Rocket For several reasons, it is inaccurate and misleading to claim that the sound of mid-frequency active sonar in water is equivalent to a Saturn V […]
The effect of mid-frequency sonar on marine mammals is a controversial topic. This was originally posted on a Navy web site. Comparing Mid-Frequency Active Sonar to a Saturn V Rocket For several reasons, it is inaccurate and misleading to claim that the sound of mid-frequency active sonar in water is equivalent to a Saturn V rocket. Sound levels in water and sound levels in air are expressed very differently*, and therefore comparing sound levels in water and air must be done carefully. As an example of the difference in the way sound levels are received in air versus water, note that a sound level of 120 dB sound pressure level in air (similar to a rock music amplifier 4-6 feet from the listener) can cause hearing damage or distress to humans and animals, while human divers and animals receiving 120 dB sound pressure level underwater experience no such issues. 1. Saturn V Rocket is 10x Louder: At 1000 yards (914 m) from a Navy ship, the receive level for mid-frequency active sonar is approximately 175 dB in water. At the same distance in water, a Saturn V rocket would register 197 dB. This 22 dB difference means that the Saturn V rocket would have approximately ten times greater intensity than mid-frequency active sonar at the same distance. Temporary threshold shift (TTS), which is the National Marine Fisheries Service’s baseline for non-permanent effects on marine mammals, is 195 dB, so the Saturn V rocket would have the potential to cause TTS to marine mammals at 1000 yards, whereas mid-frequency active sonar at the same distance would not. 2. Saturn V Sound is Continuous, Mid-Frequency Active Sonar Sound is Intermittent: Rocket engine noise is a continuous sound source, lasting for many minutes at a time. By comparison, sonar pings are intermittent, with each ping lasting one second or less and being repeated about every 30 seconds. Over the course of one minute, ship and animal movement at sea would make it very unlikely that a marine mammal would be exposed to even two sonar pings. By comparison, marine mammals would be far more likely to be exposed to the continuous “roar” of rocket engine sound during a similar timeframe. 3. Saturn V Frequencies Would Potentially Affect More Species: Rocket engine sound is a broadband sound, spanning as many as five octave frequencies. Sonar signals are limited to a narrow band, typically 1/3 octave frequencies or less. The greater number of frequencies from the broadband rocket sound would make it likely that more types of species would be affected by the rocket sound than by the narrow band sound of mid-frequency active sonar. *All sound levels in water are referenced to 1 microPascal (μPa). All sound levels in air are referenced to 20 microPascal (μPa), often expressed as sound pressure level (SPL). Sound waves with the same intensities in water and air have relative intensities that differ by 61.5 decibels (dB). Therefore, 61.5 dB must be added to relative intensities in air to obtain the relative intensities of sound waves in water.

Whales and the Navy

Whales and the Navy By Susan Chambers, Staff Writer Tuesday, February 10, 2009 | The U.S. Navy, pressured by coastal residents has extended a comment period on its plans to double its area for training off the coasts of Northern California, Oregon and Washington. News of the Navy’s plans spread through e-mails and on blogs […]
Whales and the Navy By Susan Chambers, Staff Writer Tuesday, February 10, 2009 | The U.S. Navy, pressured by coastal residents has extended a comment period on its plans to double its area for training off the coasts of Northern California, Oregon and Washington. News of the Navy’s plans spread through e-mails and on blogs on the Internet two weeks ago as notices about public meetings were sent out. But many folks were outraged, contending there was insufficient public notice and too few public meetings. The deadline has been extended to Wednesday, Feb. 18. New national security challenges and advancement in technology make it necessary, the Navy said. “Recent world events have placed the U.S. military on heightened alert in the defense of the U.S. and in defense of allied nations,” the Navy said. The Navy started scoping meetings in 2007 to get input on its study for the training complex. The 60-day process started in July and included meetings held in September 2007. The Navy received 50 comments, 23 of which expressed concerns or opposition to the training’s impact on marine mammals, such as whales. Bruce Mate, the director of the marine Mammal Institute at Oregon State University, said in an e-mail the Navy plans to use high-energy sonar, up to 235 decibels. The National Marine Fisheries Service, he said, limits the sounds of human activities to no more than 160 decibels. Editor Note: Mate does not seem to take into account that the sound pressure level decreases with range and the acoustic intensity decreases as 1/(range squared):

Navy Sonar and Marine Mammals off Hawaii

The U.S. Navy was granted a one-year permit to train with sonar and bombs in Hawaii waters so long as it tries to protect whales and other marine animals from harm. This is a controverial topic. It is covered in a full day in ATI’s course Advanced Topics In Underwater Acoustics. http://news.yahoo.com/s/ap/20090114/ap_on_re_us/navy_whales_1 Environmental Impact Considerations […]
The U.S. Navy was granted a one-year permit to train with sonar and bombs in Hawaii waters so long as it tries to protect whales and other marine animals from harm. This is a controverial topic. It is covered in a full day in ATI’s course Advanced Topics In Underwater Acoustics. http://news.yahoo.com/s/ap/20090114/ap_on_re_us/navy_whales_1
  • Environmental Impact Considerations for Underwater Sound (Ellison) Anthropogenic sound impacts on marine animals. Permit requirements and process. US Federal Regulations, NEPA, MMPA, ESA, Magnuson-Stevens Act, Coastal Zone Management Act, National Marine Sanctuaries Act. International regulations and guidelines. Monitoring and mitigation.   
  • Marine Bioacoustics for Engineers (Ellison) Fundamentals of Marine Animal Hearing and Communication. Bioacoustic metrics. Acoustic exposure criteria for harm and significant behavior response for marine mammals. Developing criteria for fish and turtles. Behavioral testing techniques. 
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    https://aticourses.com/advanced_topics_underwater_acoustics.html