Side Scan Sonar

Side Scan image of the wreck and dock (Image by David Mallinson).

The Geology Department team conducted a side scan sonar survey of a river shipwreck at Rose Hill Plantation on the Cape Fear River  showing the bathymetry and signature of the hull. Side-scan uses a sonar device that emits conical or fan-shaped pulses down toward the seafloor across a wide angle perpendicular to the path of the sensor through the water, which may be towed from a surface vessel or mounted on the ship’ hull. The intensity of acoustic reflections from the seafloor of this fan-shaped beam is recorded in a series of cross-track slices. When stitched together along the direction of motion, these slices form an image of the sea bottom within the swath (coverage width) of the beam