DHS Tests Robot for Tracking Oil Spills Under Arctic Ice

As ice recedes and maritime activity increases in the Arctic, the Department of Homeland Security (DHS) is preparing for incidents involving oil and hazardous materials in U.S. Arctic waters. As the lead agency to plan for and respond to environmental threats under the National Oil and Hazardous Substances Pollution Contingency, the Coast Guard is addressing major challenges in spill response - including information-gathering. 

“Because of ice coverage and the tyranny of distance, it is difficult to get resources and assets up in the Arctic in a quick manner,” said Kirsten Trego, Executive Director of the Coast Guard’s Interagency Coordinating Committee on Oil Pollution Research. “With better real-time data, more effective response strategies can be developed and deployed.”

To help the Coast Guard map oil spills under ice, the DHS Science and Technology Directorate (S&T) has been working on an underwater robot for the past four years through the Arctic Domain Awareness Center (ADAC) at the University of Alaska Anchorage, in partnership with the Woods Hole Oceanographic Institution (WHOI) and Monterey Bay Aquarium Research Institute.

The result of this research is the Tethys Long Range Autonomic Underwater Vehicle or LRAUV, a helicopter-portable, torpedo-shaped system with oil sensors and navigation capabilities. This robot can provide real-time data for first responders by producing and transmitting 3-D maps of crude oil, diesel, gasoline and kerosene spills. ADAC recently tested this technology in California and plans to do more tests this year and next, including under-ice tests.

The work on LRAUV started in January 2015, the idea born from the stress around the Deep Water Horizon spill in the Gulf of Mexico in 2010, which was measured with “limited sensors and short duration platforms” according to Gemelas.

By comparison, the LRAUV can rove for an impressive 15 days and travel for 370 miles without recharging batteries, and the latest prototype can make about one to two knots. Working in tandem with buoys installed on the ice, the LRAUV can provide invaluable data about a spill.

“This vehicle is the first of its kind. We haven’t previously been able to characterize oil spills with an underwater vehicle under solid ice pack,” said ADAC Executive Director retired Major General Randy “Church” Kee.

This technology opens up possibilities for Coast Guard response capabilities. For example, if there was a large oil spill in the Russian Chukchi Sea, where Russia and Alaska meet, and the spill drifted into U.S. waters, Coast Guard responders could quickly mobilize a team to deploy the LRAUV. After deployment, they could monitor the data transmission from the robot back at their command center. The robot would scan for oil below and around the ice, and transmit via the specially installed buoys.

Since there is no cellular coverage in the vast Arctic, the buoys – equipped with Very High Frequency antennas to transmit data via satellites – are a key component to the LRAUV’s success. When deployed, the buoys will provide solar or wave power to recharge the robot’s batteries, an effective way to keep it charged in such remote conditions.

“Solar power units are increasingly very sensitive,” Kee said. “Even in dark conditions and snow-laden environments, solar panels can still capture light reflected from the ice.” 

Putting LRAUV to the Test

On September 27, 2018, ADAC conducted an open-water test of its LRAUV prototype in Monterey Bay, California, with the goal to characterize an oil spill and transmit data back to shore.

“The researchers showed us how LRAUV works; this was the first test with the oil sensors and data transmission in action,” said Trego.

The researchers equipped the underwater robot with chemical sensors and simulated an oil spill from a vessel by “leaking” a non-toxic, neon green sea dye into the water. The dye, just like oil, can float in the top 13 feet of the water column, but biodegrades in sunlight in a matter of hours.

The robot surfaced every few minutes to transmit and receive data from the control vessel and check its location using cellular connection. After several hours, LRAUV had scanned successfully the whole area and transmitted the data to shore for analysis.

ADAC plans to complete all rigorous testing – including under-ice tests – and the construction of communication relay buoys by the end of June 2019.

“The demonstration in September highlighted the unique capabilities of LRAUV, which will be a welcome addition to the suite of tools used to deal with oil spills,” Trego said.  “We look forward to the further development of LRAUV’s capabilities, additional testing in real world conditions, and transitioning it into operational use.”

This article appears courtesy of DHS S&T News, and it may be found in its original form here.