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Geoff Shilling

Principal Engineer

Email

gbs@apl.washington.edu

Phone

206-221-7261

Department Affiliation

Ocean Physics

Publications

2000-present and while at APL-UW

Multi-month dissipation estimates using microstructure from autonomous underwater gliders

Rainville, L., J.I. Gobat, C.M. Lee, and G.B. Shilling, "Multi-month dissipation estimates using microstructure from autonomous underwater gliders," Oceanography, 30, 49-50, doi:10.5670/oceanog.2017.219, 2017.

More Info

1 Jun 2017

Ocean turbulence is inherently episodic and patchy. It is the primary mechanism that transforms water mass properties and drives the exchanges of heat, freshwater, and momentum across the water column. Given its episodic nature, capturing the net impact of turbulence via direct measurements requires sustained observations over extended temporal and/or broad spatial scales.

Near-real-time acoustic monitoring of beaked whales and other cetaceans using a Seaglider

Klinck, H., D.K. Mellinger, K. Klinck, N.M. Bogue, J.C. Luby, W.A. Jump, G.B. Shilling, T. Litchendorf, A.S. Wood, G.S. Schorr, and R.W. Baird, "Near-real-time acoustic monitoring of beaked whales and other cetaceans using a Seaglider," Plos One, 7, e36128, doi:10.1371/journal.pone.0036128, 2012.

More Info

18 May 2012

In most areas, estimating the presence and distribution of cryptic marine mammal species, such as beaked whales, is extremely difficult using traditional observational techniques such as ship-based visual line transect surveys. Because acoustic methods permit detection of animals underwater, at night, and in poor weather conditions, passive acoustic observation has been used increasingly often over the last decade to study marine mammal distribution, abundance, and movements, as well as for mitigation of potentially harmful anthropogenic effects. However, there is demand for new, cost-effective tools that allow scientists to monitor areas of interest autonomously with high temporal and spatial resolution in near-real time. Here we describe an autonomous underwater vehicle — a glider — equipped with an acoustic sensor and onboard data processing capabilities to passively scan an area for marine mammals in near-real time. The instrument developed here can be used to cost-effectively screen areas of interest for marine mammals for several months at a time. The near-real-time detection and reporting capabilities of the glider can help to protect marine mammals during potentially harmful anthropogenic activities such as seismic exploration for sub-sea fossil fuels or naval sonar exercises. Furthermore, the glider is capable of under-ice operation, allowing investigation of otherwise inaccessible polar environments that are critical habitats for many endangered marine mammal species.

Passive-acoustic monitoring of odontocetes using a Seaglider: First results of a field test in Hawaiian waters.

Klink, H., D.K. Mellniger, M.A. Roch, K. Klinck, N.M. Bogue, J.C. Luby, W.A. Jump, J.M. Pyle, G.B. Shilling, T. Litchendorf, and A.S. Wood, "Passive-acoustic monitoring of odontocetes using a Seaglider: First results of a field test in Hawaiian waters." J. Acoust. Soc. Am., 129, 2536, doi:10.1121/1.3588409, 2011.

More Info

1 Apr 2011

In fall 2009 the University of Washington, Applied Physics Laboratory conducted in collaboration with the Oregon State University, a comprehensive field test of a passive-acoustic Seaglider along the western shelf-break of the island of Hawaii. During the 3 week mission, a total of approximately 170 h of broadband acoustic data [194 kHz sampling rate] were collected. The recordings were manually analyzed by an experienced analyst for beaked whale (Ziphiidae), dolphin (Delphinidae), and sperm whale (Physeter macrocephalus) echolocation clicks as well as echo sounder pings emitted by boats in the area. Here we present and discuss first results of these data analysis, which revealed that more than 50% of the recorded files (each of 1-minute duration) contain bioacoustic signals. Furthermore the recorded data and the results of the manual analysis are used to validate and optimize an automated classifier for odontocete echolocation clicks, which was developed in a collaborative effort with San Diego State University. The algorithm is intended to be implemented on the Seaglider to enable species identification by classifying detected echolocation clicks in (near) real-time during sea trials.

Inventions

Deepglider, Autonomous Underwater Vehicle

Record of Invention Number: 47946

Geoff Shilling

Disclosure

17 Jan 2017

Temperature Microstructure Instrument Controller Logger

Record of Invention Number: 47906

Luc Rainville, Jason Gobat, Adam Huxtable, Geoff Shilling

Disclosure

6 Dec 2016

Passive Miniature Acoustic Recorder for Seaglider

Record of Invention Number: 47208

Ben Brand, Jason Gobat, Adam Huxtable, Geoff Shilling

Disclosure

22 Jan 2015

More Inventions

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
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