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Chris Jones

Senior Engineer






Chris Jones's research interests include both forward inverse problems in ocean acoustics. He is involved in research on scattering from and within ocean sediments, as well as inversions of acoustic signals to examine biological activity, hydrothermal plume flow, and particle size distributions.


2000-present and while at APL-UW

Tracking beaked whales with a passive acoustic profiler float

Matsumoto, H., C. Jones, H. Klinck, D.K. Mellinger, R.P. Dziak, and C. Meinig, "Tracking beaked whales with a passive acoustic profiler float," J. Acoust. Soc. Am., 133, 731-740, 2013.

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1 Feb 2013

Acoustic methods are frequently used to monitor endangered marine mammal species. Advantages of acoustic methods over visual ones include the ability to detect submerged animals, to work at night, and to work in any weather conditions. A relatively inexpensive and easy-to-use acoustic float, the QUEphone, was developed by converting a commercially available profiler float to a mobile platform, adding acoustic capability, and installing the ERMA cetacean click detection algorithm of Klinck and Mellinger [(2011). J. Acoust. Soc. Am. 129(4), 1807–1812] running on a high-power DSP. The QUEphone was tested at detecting Blainville's beaked whales at the Atlantic Undersea Test and Evaluation Center (AUTEC), a Navy acoustic test range in the Bahamas, in June 2010. Beaked whale were present at AUTEC, and the performance of the QUEphone was compared with the Navy's Marine Mammal Monitoring on Navy Ranges (M3R) system. The field tests provided data useful to evaluate the QUEphone's operational capability as a tool to detect beaked whales and report their presence in near-real time. The range tests demonstrated that the QUEphone's beaked whale detections were comparable to that of M3R's, and that the float is effective at detecting beaked whales.

Multibeam sonar observations of hydrothermal flows at the Main Endeavour Field

Rona, P.A., K.G. Benis, C.D. Jones, and D.R. Jackson, "Multibeam sonar observations of hydrothermal flows at the Main Endeavour Field," J. Acoust. Soc. Am., 129, 2373, doi:10.1121/1.3587686, 2011.

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1 Apr 2011

The Cabled Observatory Vent Imaging Sonar has been deployed at the Main Endeavour Node of the Canadian Neptune cabled observatory and has acquired data on plume and diffuse hydrothermal flows. Based on the Reson 7125 multibeam sonar and operating at 200 and 400 kHz, two-dimensional and three-dimensional time series are produced using plume backscattering, Doppler shift, and acoustic scintillation. Hydrothermal plumes and diffuse flow are important as agents of transfer of heat, chemicals, and biological material from the mantle and crust into the ocean in quantitatively significant amounts. High-frequency sonar measurements offer the possibility of inversion to obtain fluxes of central importance in these processes. Long-term time series, obtainable in cabled systems, allow observations of hydrothermal response to tidal, tectonic, and volcanic forcing. Examples will be given of plume bending due to currents, determination of entrainment of ambient water, time variation of diffuse flows, and Doppler determination of volume flux.

Basis of acoustic discrimination of chinook salmon from other salmons by echolocating Orcinus orca

Au, W.W.L., J.K. Horne, and C. Jones, "Basis of acoustic discrimination of chinook salmon from other salmons by echolocating Orcinus orca," J. Acoust. Soc. Am., 128, 2225-2232, doi:10.1121/1.3473697, 2010.

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1 Oct 2010

The "resident" ecotype of killer whales (Orcinus orca) in the waters of British Columbia and Washington State have a strong preference for Chinook salmon even in months when Chinook comprise less than about 10% of the salmon population. The foraging behavior of killer whales suggests that they depend on echolocation to detect and recognize their prey. In order to determine possible cues in echoes from salmon species, a series of backscatter measurements were made at the Applied Physics Laboratory (Univ. of Wash.) facility on Lake Union, on three different salmon species using simulated killer whale echolocation signals. The fish were attached to a monofilament net panel and rotated while echoes were collected, digitized and stored on a laptop computer. Three transducer depths were used; same depth, 22 and 45 degrees above the horizontal plane of the fish. Echoes were collected from five Chinook, three coho and one sockeye salmon. Radiograph images of all specimens were obtained to examine the swimbladder shape and orientation. The results show that echo structure from similar length but different species of salmon were different and probably recognizable by foraging killer whales.

More Publications

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center