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acoustic

Aug 16, 2013

Ocean Acoustics

Example of the readout from the Zooplankton Acoustic Profiler (ZAP).

In the terrestrial world, we rely heavily on optics and our vision, and less so on acoustics and hearing. In the ocean, the opposite is true. In coastal waters, light only travels relatively short distances (5-20m), so marine animals use light for sensing only the very near-field environment, while sound can travel huge distances (1-1000km), and informs marine animals of distant features and events. Marine scientists also take advantage of the efficiency with which sound travels in the ocean, and use it to both investigate and...

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ZAP | Zooplankton Acoustic Profiler | acoustic | data | active acoustics | passive acoustics | hydrophones | sonar | adcp

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May 3, 2013

Strait of Georgia Hydrophone Array now Live at 170 m

Example of hydrophone data, collected by the VENUS Strait of Georgia East node.

We have successfully re-deployed the hydrophone system in Strait of Georgia at 170 m. Lloyd’s mirror is nicely represented in this spectrogram from May 2, 2013.

 

 

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acoustic | Hydrophone | strait of georgia | Lloyd's mirror | spectrogram

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Oct 15, 2012

Measuring Currents

Two major currents on British Columbia’s west coast, the California Current and Alaskan Current, carry water south and southwest respectively. Within NEPTUNE observatory, currents are measured using ADCPs and acoustic current meters. Each location needs to be examined independently since local bathymetry and geological features can affect the water flow.

An ADCP attached to a platform prior to deployment.

Progressive...

Read more

adcp | currents | instrumentation | california current | alaskan current | acoustic | doppler | RDI

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Apr 30, 2012

Calibrated Acoustic Backscatter Volume Sv Values

Calibrated acoustic backscatter volume Sv values.

After years of collecting, presenting, and delivering raw echo-sounder data, we have (finally) got around to confirming the calibration of our echo-sounder systems and can now produce calibrated backscatter volume values [Sv]. Shown here is the ZAP echo-sounder data from April 18, 2012 in Saanich Inlet.

The raw counts have now been converted into proper volume backscatter values [dB re 1/m],...

Read more

data | echosounder | acoustic | ZAP | saanich inlet | venus

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Apr 23, 2012

Transient Killer Whale Sounds Recorded at Strait of Georgia

Studying marine mammals vocalizations in the ocean has been an ongoing Ocean Networks Canada project. A number of hydrophones have been installed and tested on the VENUS observatory, both in Saanich Inlet and the Strait of Georgia. As identified by the research community, the main area of interest in this research is the Strait of Georgia. A busy marine traffic lane, home to the resident Killer Whales, the Strait also provides a hunting ground for transient Killer Whales.

Today we wanted to feature sounds captured on the deepest (300m) Central Node hydrophone system in the...

Read more

Hyrophone | acoustic | data | venus | saanich inlet | strait of georgia | Whales | killer whales | orcas | Marine Mammals

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