Mapping the Past

My name is Ben Houseman, and I am an Honours Student on the current Ice Age Geology of the Great Barrier Reef

Mid-last year, I completed a Bachelor of Science at the University of Queensland (UQ)

Prior to this voyage, I had no experience working and living on a research vessel of this type. My role on the ship will be to aid the marine technicians as they perform systematic bathymetry mapping of the Australian continental shelf using multibeam sonar systems. I will spend time monitoring the sonar system in real-time, as well as aiding in data processing. My prior experience with mapping comes from geographical information systems and remote sensing courses that I took as an undergraduate at UQ. I am keen to get involved with and learn from the experienced marine technician team aboard the Falkor, as we uncover for the first time what lies on the seabed adjacent to the Southern Great Barrier reef.



When I first entered the science control room with its ‘wall of screens,’ I felt a bit of sensory overload. However, as time has gone on, I feel more at ease and confident during my time on watch. During my watch, I ensure that systems are running as intended and notify the marine techs or bridge if anything seems out of sorts. We are currently running two multibeam systems, a Kongsberg EM710 and EM302

I had the opportunity to aid the marine technicians as they released an Expendable bathymetry thermograph, or “XBT.” This is a device that is used to measure temperature and time through the water column. From this, the sound velocity can be determined, and the multibeam sonar data can be corrected adequately.

After a quick tutorial, I released the XBT off the aft deck. The XBT is held in a cartridge and loaded into a handheld launcher. When a steel pin is pulled, a lead weight attached to a fine copper signal cable falls through the water column. When the weight hits the seafloor, the copper wire is manually snapped off. The data captured by the XBT is relayed back to the Falkor’s computer in real-time and uploaded to the multibeam sonar.

I am excited to see the data we will gather during this expedition and continue learning about different methods for data collection.

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