TRASNA Blog – Day 3

TRASNA Blog – Day 3

Written by:
Rachel Wireman
Jamie Maxwell
Geologist Marine Scientist
College of Charleston NUIG

May 14, 2016

After the intensity of yesterday’s hurricane force seas, today was a much needed calmer day. The conditions were, in fact, so bad yesterday that we were unable to collect data for much of the day. Now, we are back to collecting the data we came here for!

I have been helping Fabio Sachetti, a scientist with the Marine Institute of Ireland, clean data collected last year in Ireland’s Youghal Bay with a multibeam system. It is important that this data be cleaned as well as possible because it will ultimately be used to update nautical charts in the region. Interestingly, Fabio noted, the cartographers will take the highest point in the bathymetric data and mark that as the depth. For this reason, it is imperative that all exorbitant data be cleaned out for safety reasons of those navigating these regions.

Because it’s so important that the data be as detailed and accurate as possible, a Kongsberg EM2040 multibeam system was used. The EM2040 will send out many pings in a short amount of time, gathering as much data as possible.  Alternatively, this means the data is very dense and can take months to clean properly. Another stumbling block in this region is kelp. It is very common and will easily give a false bottom reading for the multibeam system.  

Additionally, scientist Jamie Maxwell has created a logo for this and future TRASNA expeditions. It definitely highlights the mission of the transect!