LÉ Niamh to track sea wave activity for research project
Sensor on bow of Naval Service vessel measures sea states for NUI Galway project
Irish Naval vessel LÉ Niamh with the NUIG sensors attached at the bow to measure ocean surface information. Photograph: Brian Ward
Irish Navy vessel LÉ Niamh carrying migrants into Palermo. The measurements are collected whenever the ship leaves port, and in no way interfere with its humanitarian work. Photograph: Reuters/Guglielmo Mangiapane
The Naval Service patrol ship LÉ Niamh is not only rescuing refugees in the Mediterranean. It is also gathering information for a marine research project which could make life a lot easier for international shipping.
Months before the ship was deployed to take over from the LÉ Eithne on humanitarian rescue, it was fitted with ultrasonic sensor equipment on its bow which measures sea states.
This in turn could make for quicker, safer sea journeys, with less turbulence, and could prove valuable for shipping companies, weather forecasting and other offshore activities, according to Dr Brian Ward of NUIG’s AirSea Lab.
Technology developed by NUIG’s AirSea Lab at NUIG and fitted on the Naval Service patrol ship is collecting data which can be compared with wave measurements mounted on buoys at sea.
“This will help to develop sophisticated algorithms to compute the wave spectra,” Dr Ward said.
The measurements are collected whenever the ship leaves port, and in no way interfere with its humanitarian work. The fact that it can provide information from both the Atlantic and Mediterranean is of additional value to the project.
Dr Ward is heading to sea himself this week to carry out work on a separate experiment which aims to track oil spills.
As Dr Ward explains, oil spills at sea do not follow tracks predicted in existing sea forecasting models.
“Oil changes the physics of the ocean surface, and virtually shuts down wave activity – hence the saying ‘pouring oil on troubled waters’,” he said.
He and his Norwegian colleagues have hired the Tarrea Queen angling boat in Galway, and will use it to deploy instruments to measure turbulence, waves and air-sea momentum transfer in Galway Bay.
His team has devised a profiling instrument known as an air-sea interaction profiler which will be deployed each day.
“We will then pour a very small quantity of cod-liver oil into its path, which will provide a record of the turbulence both inside and outside the oil patch,” he said.
“At the same time, the instruments on the boat will measure the dampening of the waves from the oil.”
Earlier this year, Dr Ward and the Norwegian team travelled north to Svalbard to conduct related experiments on ice, measuring the “dampening” of waves at the ice-water interface.