HSL successfully completed a geophysical survey at Greenore Port in March 2018 mapping depth to bedrock across a proposed port development. HSL utilised a dual frequency sub bottom profiler operating at a frequency of 3.5 kHz to record seabed and subsurface feature levels in both digital and echogram format. The wet end transducer was mounted to a pole and attached to the starboard side of the survey vessel. . The survey took one day to complete all fieldwork.
The sub bottom profiler technique can be used as a low cost alternative to more expensive multichannel seismic surveys giving detail on depth to bedrock, layers within the overburden and sea bed level. HSL has successfully completed numerous similar projects to this giving detail of depth to bedrock and flagging any subsurface anomalies.