Tag: noaa vessel fairweather

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Linda Armwood, April 28, 2006

NOAA Teacher at Sea
Linda Armwood
Onboard NOAA Ship Fairweather
April 25 – May 5, 2006

Mission: Hydrographic Survey
Geographical Area: Aleutian Islands, Alaska
Date: April 28, 2006

Weather Data from Bridge 
Visibility: 10 nautical miles (nm)
Wind direction: 190 °
Wind speed:  13 kt
Sea wave height: 1 ft.
Swell waves dir: 310
Swell waves height: 2 ft.
Seawater temp: 7.3
Sea level pressure: 1012.4mb
Present weather: Mostly cloudy
Temperature:  °C~ 6.5dry/5.0wet

NOAA divers preparing to install a tide gauge at Noyes Island, AK
NOAA divers preparing to install a tide gauge at Noyes Island, AK

Science and Technology Log 

The project’s first priority for the day was to get the tide gauge installed and to set tidal benchmarks.  The tides party consisted of three onshore crews: the reconnaissance and planning team; the benchmark recovery and installation team; and the dive and install team.  I was assigned to the dive and install team boat in order to observe the divers install the tide gauge. I did not observe the underwater installation below the pier; however, the secure installation of the above water equipment was a major undertaking!  The tide gauge installation involves the proper placement of the following items:

  • satellite antenna
  • gps antenna
  • hydro gauge
  • solar panel
  • 12-volt battery
  • nitrogen cylinder
  • nitrogen regulator

I assisted in drilling with the benchmark recovery and installation team.  The historic benchmark was located about 15 feet from the low water line and the next four benchmark locations were set at 200 feet apart from one another in somewhat of a straight line from the historic benchmark.  Benchmarks are important because they represent permanent marks of the land leveling system.  The tidal gauge will automatically read water pressure which it then converts to depth every six minutes over the next 30 days in order to determine the constituents of the tide-generating force. Determining these constituents allows the survey technicians to form possible hypotheses related to ranges, heights, rates and future directions of tides.

Ensign Matthew Glazewski drills to establish a benchmark on Noyes Island, AK.
Ensign Matthew Glazewski drills to establish a benchmark on Noyes Island, AK.

Personal Log 

At the time of this writing, the weather was as stated above; however, during the tides party the weather was miserable with intermittent showers of sleet followed by sunshine and overcast.  The kindness extended to the crew by the Noyes’ Island caretaker will be remembered.

Question of the Day 

Environmental Science and Geospatial Semester Students 

Give some possible non-human factors that may have an effect on the decision-making of tide gauge location.

Mrs. Armwood

The Tidal Party recovered this historic benchmark recovered from Noyes Island, AK
The Tidal Party recovered this historic benchmark recovered from Noyes Island, AK
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Linda Armwood, April 27, 2006

NOAA Teacher at Sea
Linda Armwood
Onboard NOAA Ship Fairweather
April 25 – May 5, 2006

Mission: Hydrographic Survey
Geographical Area: Aleutian Islands, Alaska
Date: April 27, 2006

Weather Data from Bridge 
Visibility: 4  nautical miles (nm)
Wind direction: 120 °
Wind speed:  20 kt
Sea wave height: 1-2 ft.
Swell waves dir: 300
Swell waves height: 2 ft.
Sea level pressure: 1006.0mb
Present weather: Drizzle
Temperature:  °C~ 7.6dry/7.1wet

Science and Technology Log 

I attended the navigation meeting in preparation for today’s departure from home port.  The personnel responsible for conducting the navigation meeting and providing all of the essential information for exploration are junior officers who are trained in atmospheric science, oceanography, mathematics and navigation technology.  Several charts were displayed to show the route of travel and the location of the intended areas for research.  The first priority of the project is tide gauge installation.  One particular area of the travel route (Snow Passage) will present a challenge because it is hard to go through during this time of year as a result of the currents in the narrow parts.  One of the areas of research (Gulf of Esquibel) contains lots of navigational hazards such as rocks and low water levels near high water levels. The FAIRWEATHER only needs four fathoms of water to navigate, but generally stays in water deeper than ten fathoms due to the nature of the seafloor and the age of the charts.

An in-depth explanation of the survey tech procedures in data acquisition and processing was provided by a member of the survey tech team.  Survey techs are given a charted sheet that represents their area of concentration.  In order to do this, the tech first collects raw data, including depth information, with the Global Positioning System (GPS), the Shallow Water Multibeam (SWMB), and the Position and Orientation System for Marine Vessels (POS-MV) in operation at the same time.  The POS-MV does the inertial motion of the vessel’s roll, heave, pitch, and gyro positions.  Next, the tech uses processing systems as a visual way to look at the surface of the water.  The third and fourth steps are to apply motion corrections and tide corrections.  The fifth step is to create the sound velocity profile based on water conductivity, temperature, and density.  The next step is to combine each of the files into one file – a concatenated file.  Following is the step involving computing total propagated error.  This will result in the error value based on error associated with sonar data.  Step eight is for the tech to make a digital terrain model which is a basic grid from XYZ data. The final step is to view or look for errors caused by the system. These errors may indicate dangerous uncharted errors.

Personal Log 

First time feeling the boat leave dock was a rush!  The whale sighting was awesome!  Too far from my cellular phone extended network coverage to call home and share with family.

Question of the Day 

Environmental Science Students 

Explain the importance of water conductivity, temperature and density to sound velocity.

Geospatial Semester Students 

Using course software, produce a map that indicates the bodies of water associated with the Gulf of Esquibel. Identify those areas that have less than 30-40 fathoms.

Mrs. Armwood

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Linda Armwood, April 26, 2006

NOAA Teacher at Sea
Linda Armwood
Onboard NOAA Ship Fairweather
April 25 – May 5, 2006

Mission: Hydrographic Survey
Geographical Area: Aleutian Islands, Alaska
Date: April 26, 2006

Weather Data from Bridge 
Visibility:  5 nautical miles (nm)
Wind direction: 130 °
Wind speed:  12 kt
Sea level pressure: 1004.5 mb
Present weather: Drizzle, mostly cloudy
Temperature:  °C~ 7.5dry/6.5wet

Science and Technology Log 

During the morning I concentrated on the Electronics Department to see how this operation is run. This department covers a significantly large portion of the ship in several locations. The Chief Electronics Tech explained the functioning of the iridium and INMARSAT satellites. The iridium satellite is used for low speed communication such as the telephone and e-mail.  This is primarily used at sea for hourly email transit except when launches are out.  The iridium also has a tie-in for sensors such as wind speed and barometric pressure.  The INMARSAT satellite is for high speed communication such as voice, faxes and two-way data transfer.  The management of these satellites, the Automated Information System (AIS) and all other electronic/electrical systems for the ship are managed, coordinated and maintained by the Electronics Department.

The afternoon was spent on one of the launches to observe survey technician launch operations. During the training there was a demonstration of the use of several components of data acquisition and processing.  Some of the data that is collected is sonar, boat voltage, vertical waterfall, bathymetric in 2-D view, position and orientation, heave, distance and altitude. All of this data is then processed and becomes the responsibility of the survey technician to combine the data into a single file, known as a concantenated file.

Personal Log 

I appreciate the ability to view the hydrographic navigation charts in my room through INMARSAT. This allows me to know where we are while preparing for the day.  Thanks to the Chief Electronics Tech for giving me the ship tracker web site for students and other interested persons.

Mrs. Armwood

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Linda Armwood, April 25, 2006

NOAA Teacher at Sea
Linda Armwood
Onboard NOAA Ship Fairweather
April 25 – May 5, 2006

Mission: Hydrographic Survey
Geographical Area: Aleutian Islands, Alaska
Date: April 25, 2006

Weather Data from Bridge 
Visibility:  10 nautical miles (nm)
Wind direction:  340°
Wind speed:  2 kt
Sea level pressure:  1018.8 mb
Present weather: Partly cloudy
Temperature:  °C~ 6.0 dry/5.0 wet

Science and Technology Log 

I woke up in time for breakfast at 0700.  I was joined at breakfast by the Commanding Officer, the Executive Officer, and the Chief Electronics Technician.  The conversation centered around the different careers that exist on the ship.  In addition to the careers, discussion was had regarding the ship being analogous to a city.  The XO gave me a tour of the engine room.  Amidst all of the engines and associated technology it was clear that the engine room could represent a city public utilities department and waste management facility. The sea water is the readily available water source that is filtered through a distillation process to be used on the ship for all purposes. The idea that the engineers are responsible for treating the water that is used on the ship is a credit to their knowledge and stamina.

I attended the briefing meeting conducted by the Field Operations Officer and the Chief Survey Technician. Several handouts were given and explained in reference to guidelines for this field season: presurvey, data acquisition, processing and deliverables.  These guidelines were synonymous in its most simplistic form with what I have presented to my students in preparation for laboratory experiences. Acronyms were used throughout the meeting, but I was able to follow along with the language thanks to a survey technician’s thoughtfulness in providing me with three pages of acronyms and their meanings.  As a part of the meeting, the Senior Survey Technician presented CUBE software. This software completes data analysis to offer the user possible hypotheses.  The Chief Survey Tech informed the techs against simply relying on the hypotheses offered by CUBE.

After lunch, I spent a considerable amount of time on the bridge checking out the weather monitoring instruments and the navigation technology.  The weather log is manually completed every four hours while the ship is docked and every hour while at sea.  The weather monitoring instruments and navigation technology range from simplistically designed wet/dry bulb thermometers for temperature readings to more complex in form and function technology such as the ECDIS (Electronic Chart Display Information System.)  The ECDIS has the capability to overlay radar on in use charts and display information about specific ships within the VHF radio range.  For example, information about a 1500 ton ship that is within 40 miles of the FAIRWEATHER can be displayed on the ECDIS.

Personal Log 

During the early evening I went to Settlers’ Cove to visit the rain forest. A bald eagle and two river otters were spotted feeding in the water.  Lush foliage and trees created a moderately warm and moist environment in the midst of the surrounding cold temperature.

Question of the Day 

Geospatial Semester Students 

What is the functional difference that exists between global positioning system (gps) and differential global positioning system (dgps)?

Environmental Science Students 

Compare the FAIRWEATHER survey technicians’ field survey guidelines to the Richmond Public Schools model for experimental design.

Bonus Question 

Provide a possible explanation for the Settlers’ Cove rain forest environment within the relatively cold environment of Ketchikan.

Mrs. Armwood