Tag: seafloor mapping

NOAA Teacher at Sea
Miriam Sutton
Onboard NOAA Ship Nancy Foster
June 17 – 22, 2005

Mission: Stellwagen Bank National Marine Sanctuary Survey
Geographical Area: New England
Date: June 20, 2005

Weather Data from the Bridge
Visibility: 10 nautical miles (nm)
Wind direction: 200°
Wind speed: 13kts
Sea wave height: 2-3′
Swell wave height: 1′
Sea water temperature: 15.6°C
Sea level pressure: 1005mb
Cloud cover: Partly cloudy

Science and Technology Log

More Transect lines were the plan for the day and we placed the fish in the water before 0700 for our first run at “mowing the lawn” along Stellwagen Bank. We ran 15 more Transect lines today, continuing our search for ancient maritime artifacts. We were blessed with a gorgeous day on the ocean and no logistical problems with the equipment. I began conducting interviews with the crew and scientists while continuing to assist the scientists with various remote sensing duties throughout the day.

I created an interview database and began interviewing various members of the NOAA Corps, crew, and scientists, starting with one of the most important members of the NOAA crew: Chief Steward – Jesse.

Jesse was born in Florida and told me his main job responsibility is to “keep everybody happy.” Officially, Jesse is in charge of the ship’s sanitation, food menus and food preparation. Prior to joining NOAA four years ago, Jesse worked as a Cook for the US Navy for 20 years. Jesse loves his job and being able to travel to different places but often misses his wife and 5 kids while he is away at sea. His favorite subject in school was Civil War History. He got his start in cooking as a baker during high school. When asked what lessons from life have helped him the most in his career, Jesse said, “Responsibility.”

I also asked each interviewee to describe the most unusual (e.g., funny, scary, weird) occurrence that happened to them while at sea. I am composing a Top Ten list that I will share at a later posting.

NOAA Teacher at Sea
Miriam Sutton
Onboard NOAA Ship Nancy Foster
June 17 – 22, 2005

Mission: Stellwagen Bank National Marine Sanctuary Survey
Geographical Area: New England
Date: June 19, 2005

Weather Data from the Bridge
Wind direction: 266°
Wind speed: <10kts
Sea wave height: 2′
Swell wave height: 2′
Sea water temperature: 14.4°C
Sea level pressure: 1022.4mb
Cloud cover: Scattered clouds

Science and Technology Log

After an overnight anchoring along the shores of Scituate, the NANCY FOSTER headed further offshore for another day of scanning the seafloor for ancient maritime artifacts. The sensing equipment was deployed over the Stellwagen Bank region by 0800 and we collected data until dusk.

As a southern girl who was raised in the tobacco fields of eastern North Carolina, I found today’s repetitive scanning quite similar to working on a tobacco harvester as it was being driven along row after row of tobacco. The diagram below will give you some idea of my Day 3 on the Sea! The NOAA crew refers to this type of repetitive scanning as “mowing the lawn.”

We covered 13 transect lines today, each taking about 30 minutes to cover. The side scan sonar ran beautifully all day without interference. The magnetometer was also working well but the data being fed from the 2 towfishes was not synchronizing when it arrived to the computer. The decision was made to disconnect the magnetometer and run the side scan sonar alone for most of the day.

I took sometime to look over the Stellwagen Bank National Marine Sanctuary information the Scientist Deborah Marx shared with me. I recommend that you follow this website to learn more about this remarkable area of the New England coast: http://www.stellwagen.noaa.gov.

NOAA Teacher at Sea
Miriam Sutton
Onboard NOAA Ship Nancy Foster
June 17 – 22, 2005

Mission: Stellwagen Bank National Marine Sanctuary Survey
Geographical Area: New England
Date: June 18, 2005

Weather Data from the Bridge
Visibility: 10 nautical miles (nm)
Wind direction: 200°
Wind speed: 13kts
Sea wave height: 2-3′
Swell wave height: 1′
Sea water temperature: 15.6°C
Sea level pressure: 1005mb
Cloud cover: Partly cloudy

Science and Technology Log

We awoke this morning in a heavy layer of fog which has taken most of the day to burn off into an overcast sky. While the low visibility posed additional caution to the ship’s crew, the scientists continued to scan the seafloor in search of maritime heritage resources (shipwrecks). Four sites were investigated today….

Today progressed with many more challenges in the logistics surrounding the deployment and data collection of the sensors compared to our first day of remote sensing. The first struggles began while at the first location when the cables became unplugged during deployment… twice. After a quick assessment of the problem, the scientists decided to make adjustments to the cabling device to reduce the tension and maintain the connection between the couplings on the sensor cable. Once the signal was back online, we continued searching two sites before lunch. During our lunch break, NOAA engineers began to work on ways of reducing electrical interference between the remote sensing equipment and the ship’s engines. After talking with the scientists and NOAA crew, I learned that the NANCY FOSTER is propelled by a main engine and two Z drives. Z drives are like thrusters that assist the ship in maneuvering, especially at slow speeds. Here is a brief rundown of the conflict between the engines and the sensing equipment:

• The sensing equipment needs to be towed at a slow and steady speed of about 4 knots.
• NOAA’s crew can maintain this speed in calm seas with little current using the main engine only.
• As seas pick up or current increases, the NANCY FOSTER gets a bit squirrelly and can slide off course from the predetermined transect line. Using the Z drives allows the NANCY FOSTER to run a steadier course.
• The electromagnetic field generated by the ship’s Z drive creates interference with the remote sensing equipment, especially the side scan sonar.
• NOAA engineers are onboard and have been experimenting to find a happy medium so that the Z drives can be used for better tracking but will not interfere with the remote sensing signals.

After several trials, the issue was resolved and the NANCY FOSTER is tracking smoothly along the Stellwagen Bank National Marine Sanctuary while the side scan sonar and the magnetometer are searching away for more seafloor anomalies.  I am truly amazed at the teamwork between the scientists and NOAA’s crew. From a teacher’s perspective, I see a group of people who are willing to do anything possible to help a group of scientists complete their investigation. I also see a group of scientists who are most appreciative of the overwhelming effort exhibited by the crew and willing to share various aspects of their research that the crew finds interesting. This cooperative environment generates an atmosphere of respect and camaraderie that is conducive to individuals sharing their individual talents in a collaborative effort toward the success of the entire group on board the NANCY FOSTER. What a pleasant setting to be a part of during my first adventure at sea.