Filling the Gaps: Mapping Ellice Basin

Fulfilling the Quest of Seagoing Research

SOI / Sunset Jarmusz
Jan. 08 2018

“Having a luck dragon with you is the only way to go on a quest,” says Falkor, the Luckdragon from the book The Neverending Story and the namesake of the research vessel Falkor. As Falkor is an essential part of the quest in The Neverending Story, so too is the R/V Falkor to our science missions. The state-of-the-art science systems, fantastic crew, and incredibly well-maintained ship are valuable contributors to the quest of advancing progressive scientific research. Conducting this research would not be possible without each component of the ship working together and running smoothly, so I will spend this blog describing the main sources that power the Ellice Basin mapping research for this cruise: the science systems we are using in the Science Control Room, the navigation conducted on the bridge, and the operations in the engine room.

Student Opportunity Participant Sally Jarmusz monitors the multibeam sonar mapping occurring in PIPA. The number on the left side of the screen directly in front of her, 5595, indicates that the R/V Falkor was at that moment 5595 meters above the seafloor. The top center part of the screen shows the track line that has already been mapped, while the bottom part of the screen shows the changing swath width in reference to the nadir (center) line. The two smaller, lower screens directly in front of the camera are where data cleaning occurs to edit out erroneous beam returns in the data.SOI / Sally Jarmusz

Shedding Some Light on Mapping
The science operations on board are conducted on this cruise from the Science Control Room. To fulfill the scientific quest of mapping the eastern part of the Ellice Basin, the Marine Technicians, Chief Scientist, and Student Opportunity Participants work in shifts to acquire and process mapping data from the multibeam sonar affixed to a gondola underneath the R/V Falkor. A multibeam sonar is essentially a system which transmits and receives a sound pulse, or ping.  This sound pulse travels through a transmitter located on the gondola in a fore/aft direction at a specific frequency, and a receiver placed near and perpendicular to the transmitter receives that same pulse as it bounces back off a surface. On this particular cruise, we are using medium frequency acoustic waves, which allows us to reach the deep seafloor we are passing over. The transmitter and the receiver are called transducers, meaning that they can convert energy. The transmitter converts energy into an acoustic pulse to be sent out, while the receiver converts an acoustical pulse into an electrical signal that can be processed by the computer systems. A multibeam sonar has several transducers which create a wide swath of sound beams, the width of which is determined by seafloor depth. By reading the resulting amplitude strength and travel time on the sound return, these computer systems can create high-resolution images of the ocean bathymetry. 

Student Opportunity Participant Sally Jarmusz learning from Chief Officer Jason Garwood how to take a sun sight using the sextant on board R/V Falkor. A sextant measures the angular distance between two visible objects and can be used to find the latitude of your position from a celestial body.SOI / Jason Garwood

Navigating Across The Oceans
The bridge plays a crucial role in bringing the R/V Falkor to her research destinations and back to port safely. The navigation systems include x-band and s-band radar, with x-band being a high frequency radar delivering a clearer image at short distances, while s-band is a short frequency radar that can see through rain easier. The bridge also utilizes ECDIS (Electronic Chart Display and Information System) charts, which allow the ship to navigate through a geographic information system on a computer rather than use paper charts. While deck officers are required to stand watch on the bridge, the autopilot can keep a set course and account for factors that might offset that course such as wind, swells, and current. However, traditional methods are still practiced as well, including taking range bearings and using a sextant, which can effectively give the ship’s position should technology fail.

Student Opportunity Participant Sally Jarmusz standing next to the starboard generator in the Engine Room, one of four generators which power all the systems onboard R/V Falkor.SOI / Cherie Colyer-Morris

Powering Through Research
To help me understand what powers the fundamental systems onboard the R/V Falkor and allows her to travel across oceans, 2nd Engineer Douglas Hay was kind enough to give an informative tour. While stepping into the engine room may seem like stepping into a maze, each system has a purpose which contributes to the smooth operations of the vessel. The R/V Falkor has two main MWM (Motoren-Werke Mannheim) diesel engines which power twin screw propellers. Typically, only one engine is run at a time for mapping operations, and two for DP (Dynamic Positioning) work, which includes ROV (Remotely Operated Vehicle) operations. The steering gear, located underneath the aft deck, is powered by hydraulic pumps which push oil into a cylinder, providing enough force to move the rudder. 

Overall, the quote from luck dragon Falkor holds true and applies to the R/V Falkor: all systems, components, and crew that make up Falkor are essential for any quest in scientific research.

Getting sprayed: at this stage of the voyage the R/V Falkor is currently encountering 4-5-meter swells and about 25-knot winds. We are expecting the weather to remain in this state for the next several days.SOI / Sally Jarmusz

 


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