Submersible Echo Sounder Deployment

Hydro International -

The University of Washington, working with NOAA's Northwest Fisheries Science Center (NWFSC), recently retrieved a BioSonics DT-X SUB split-beam echosounder after a one-month deployment in northern Admiralty Inlet, WA.

The study location is a proposed Snohomish Public Utility District tidal energy demonstration project site.

The BioSonics DTX-SUB is an autonomous scientific echo sounder packaged in a subsea pressure housing with integrated power management and data storage systems.

"When it's down there, collecting data, it's completely self-contained. There's no line to the surface, no signal to the surface. It's entirely contained in just what you see here," said Jim Thomson, Oceanographer with the University of Washington.

The DT-X SUB is being used to detect, categorise, and enumerate pelagic fish, invertebrate, and marine mammal species at the proposed site. The intent is to allow marine hydrokinetic (MHK) site and device developers to install tidal turbines in suitable locations while minimising behavioural effects on aquatic organisms.

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