Geophysical Investigation to Map Sea Bed and Bedrock Profile (Q3 2015).

  • Site View.
  • Site View.
  • Site view.
  • Site view.
  • Support Crew dismantling the surrounding flashing to allow for the engineering assessment to take place.

GBG Australia undertook a marine geophysical investigation to map the sea bed and to map the bedrock profile. This was done by utilising a number of different geophysical techniques which were utilised to gain varied information on the area of investigation.

Bathymetry data was collected usings the CeeHydrosystems CeeScope, which is a single beam bathymetry system. Sub bottom Profiling was undertaken using a stratabox CHIRP Seismic Reflection profiling system developed by Syquest Inc. Both of these systems can be easily mounted on the side of the survey vessel for ease of collection.Side scan sonar imaging was aslo undertaken over the survey area using the Tritech Starfish 450KHz side scan sonar system. The sidescan sonar was deployed behind the survey vessel at a depth of 6-7m above the sea bed. All survey instruments used in this investigation were supplied by GBG Australia.

Figure 1: A RTK GPS system was used to relocate all data back to its correct position

Figure 2: The GPS receiver was mounted directly above the side mounted instruments to minimise offset errors.

Figure 3: The Ceescope control box

Figure 4: The Bathymetry survey underway.

Figure 5: The Sidescan Sonar survey underway.