Unmanned gliders to help DFO measure and monitor oceans

The Department of Fisheries and Oceansis investingin a new way to monitor Canada's oceans.

The federal department has announced plans to purchase up to seven unmanned gliders. The semi-autonomous vehicles will patrol the coastlines, taking water samples and measurements along the way.

The gliders will work in tandem with researchers on ships to collect data. However,the unmanned machines can be deployed more frequently and for longer periods thantheir human research partners.

Ocean gliders are highly efficient vehicles, able to travel hundreds of kilometres powered by a small battery.

The battery either drivesa small propeller or more commonly adjusts the glider'sbuoyancy to dive and surface. Side-mounted wings push the glider forward each time it descends or climbs.

Slow but steady

The glider's reliance on changes in buoyancy make it very slow.

Speeds range from 0.5 to 1.5 km/h. But a glider can cover 700 to 3,000 kilometres on a single charge, depending on the model.

They can also dive hundreds ofmetres beneath the surface.

Packed with sensors

Ocean gliders have been used in Canada since the early 2010s. The DFO has worked with researchers at Dalhousie University and the University of Victoria to study the oceans and share data.

The gliders can measure water temperature, salinity andoxygen levels. Some models can even track sea life everything from tiny plankton to fully-grown sharks.

After working with universities for years, DFO wants to own its own gliders.

"They will be used to enhance our normal ship based sampling that happens three times a year," said an emailed statement from a DFO representative.

Ships are deployed from various points along the coast and travel seaward, making hundreds of measurements and calculations.

DFO has issued a call for tenders for up to two gliders to be used on the west coast, and up to five to be used on the eastcoast.

Companies or individuals interested in supplying the gliders have until early November to submit bids.