NOAA Teacher at Sea
Duane Sanders
Onboard Research Vessel Hugh R. Sharp
June 8-19, 2009
Mission: Sea Scallop Survey Geographical Area: New England Coast Date: June 8, 2009
Weather Data from the Bridge
Wind: Speed 16.1 KTS, Direction 50.5 degrees
Barometer: 1014 millibars
Air temperature: 16.8 0C Seas: 1-3 ft.
Science and Technology Log
The Hugh R. Sharp at dock in Delaware
I have been assigned to participate in the annual scallop survey in the New England fisheries area. Our ship, the Hugh R. Sharp, is two years old and designed specifically for ocean research. The Sharp is owned by the University of Delaware and is under contract with NOAA for the scallop survey. It has laboratories, a workshop and specialized equipment for handling large or bulky devices. There is a continuous data stream gathered by the ship’s instruments and posted on monitors on the bridge and in the lab. This includes some parameters related to ocean chemistry as well as the usual weather data. There are several other high-tech sensing systems to assist in a variety of research projects. The ship’s flexible design allows for the science team to install computers, servers and ancillary equipment specific to the research project at hand. Also, modular labs outfitted for specific purposes can be secured to the fantail (rear deck) of the ship.
My favorite piece of technology is the diesel electric drive system. Diesel generators produce electricity that supply power to the drive motors all other electrical needs on the ship. Propulsion is provided by thrusters, which are capable of rotating in any direction as needed. There are two thrusters in the stern and one in the bow. These three acting together can keep the Sharp within six feet of a specified location. The ship’s engineer can monitor all systems from his station on the bridge. This system is very quiet and vibration is kept to a minimum. That means we can sleep much better than with a conventional diesel engine drive. All in all, this vessel seems to me to be an ocean scientist’s dream come true. It is designed for high-tech applications and configurations that change as the need arises.
Here I am practicing donning my emergency immersion suit.
Personal Log
Today is our first day at sea. We spent the morning hours getting acquainted with each other and learning about safety, emergency procedures and shipboard etiquette. For example, the science team was divided into two watches, midnight to noon and noon to midnight. The rule is that people coming on watch need to take everything they want to use during watch hours with them. This allows those coming off watch to get some undisturbed rest. Living in close quarters requires everyone to be considerate and cooperative. We all rely on each other to do their part to help make the cruise a safe and successful one. While there is always room for some fun, everybody takes their responsibilities quite seriously. Life and limb often depend on this careful approach to our work.
NOAA Teacher at Sea
Susan Smith
Onboard NOAA Ship Rainier
June 1-12, 2009
Mission: Hydrographic survey Geographical area of cruise: Trocadero Bay, Alaska; 55°20.990’ N, 33°00.677’ W Date: June 8, 2009
Weather Data from the Bridge
Temperature: Dry Bulb: 13.9°C (57°F); Wet Bulb: 12.2C (54°F)
Cloudcover: Overcast 8/8
Wave Height: 0-1
Visibility: 10 nautical miles
Wind: 325, 4 kts.
Sea Wave Height: 0-1
Sea water temperature: 12.2°C (54°F)
Tide Gauge
Science and Technology Log
Before I explain the science we did today, I will answer the question posed on log number 3: What is a patch test and why is it run? A patch test is used to find offsets in sonar setup (continuous errors) and timing errors. It is done whenever physical alterations occur with the sonar. Such problems can occur when it is mounted skewed, or not in perfect line with the ship.
Staff positioned in the water
The Patch Test checks pitch, roll, and yaw. The ship is run out from the shore and back into shore, along the same line. The computer has all offsets set to zero. A swath is sliced at the edge so the computer is looking at the outer beams from the side. With a roll offset it must be changed from an X pattern to a single, flat line. With a pitch offset, a nadir view is taken, the angle is adjusted until the two lines (one out from shore, one into shore) form a single straight line. Yaw also has two lines offset so they must be combined to one line configured identical to the two lines. The Patch Test takes approximately one to two hours to complete.
Susan with level rod
Today I was involved in obtaining data relevant to tides. We used a tide gauge, levels, GPS, and a staff placed in the water, with a nitrogen being pumped under it. The tide gauge measures the unit of pressure it takes for a nitrogen bubble to be squeezed out. The greater the amount of water covering it the greater pressure is required to release a bubble. To get water depth, someone reads the staff water level and continually records this information for three hours. This will enable us to know the difference in the pressure gauge readings and the staff water level. A Global Positioning System (GPS) is used to determine where the staff is by getting a good constellation (satellites in orbit) reading.
Benchmark set in concrete
It was my job to hold a level rod on the primary benchmark location while someone else recorded measurements using the surveyor’s level (The level rod is measured in centimeters). The surveyor’s level has three lines, or stadia, inside the level. These lines are read as upper, middle, and lower. I placed a smaller bubble level against the rod to make sure it was straight up and down. Once my location was recorded a second person, also holding a level rod, placed hers on a staff (a triangular wood structure) set in the water. The surveyor’s level was disturbed, then a second reading was taken at the staff, and a second reading was taken at my benchmark. If the numbers did not match within a certain range, or historical data, the measurements had to be repeated.
Rainier pulling into dry dock
We went through this process for five benchmarks. These benchmarks were placed in specific locations based on elevation and stability of the ground above high tide level. This procedure is completed to ensure the benchmarks and the staff have not been moved, by either human disturbance or a natural occurrence, such as an earthquake. As a side note, in some locations these benchmark rods have had to be drilled down 125 feet. In the Arctic they may be drilled 25 feet into the permafrost. When drilling the holes for the benchmarks care must be given to ensure the surface is smooth, not skewed, or at an unusual angle.
Sometimes a temporary benchmark, called a turtle, must be used. This is a small, heavy, circular piece of equipment, which can be placed anywhere solid. The person holding the staff can turn all the way around it to allow for different measurements. All data collected in this activity are sent to NOAA’s tides office.
Personal Log
After viewing the ship’s photography server I have become interested in what actually goes on in the dry dock. The dry dock is in Seattle where the ship goes for repairs, restoration, and refitting. After the launches and other things are removed from the ship it goes to the dry dock. Gates close off the ends. On the floor of the dock are blocks for the ships hull to sit on, placed exactly in line for this particular ship. Divers go down to check for precise placement before the water is drained. The ship is tied to the dock to stabilize it (prevent it from tilting or falling off the blocks) and if you are not off the ship before it goes into dry dock you are not getting off anytime soon! On the hull are numbers used to identify the ship’s sections. When it is being retrofitted the workers must know where each section came from so the ship can be put back together correctly.
Rainier pulling into dry dockNight welding goes on very lateCompare the truck size to the shipTape where the symbol and number were paintedUnderside of ship on the blocks; the black hole is on for anchor storageWater filled dock so ship can depart
Dry dock operations can take from two months to over a year, depending on the work needing to be done. Crew stays on board as long as possible. When berths are being refurbished they stay in local hotels. Other personnel either work on other NOAA ships or go to other project sites. (All dry dock photographs courtesy of Rainier picture server)
NOAA Teacher at Sea
Jeff Lawrence
Onboard Research Vessel Hugh R. Sharp
June 8-19, 2009
Mission: Sea scallop survey Geographical area of cruise: North Atlantic Date: June 8, 2009
Weather Data from the Bridge
SW winds: 5-10KT
Seas: 1-2ft
Barometric pressure: 1035 mb
Air Temperature: 75˚F
Visibility: clear
Science and Technology Log
The Research Vessel Hugh R. Sharp set sail this morning around 9AM from Lewes, DE. There are 11 members of the scientific crew and volunteers, including two TAS participants: myself (Jeff Lawrence) from Oklahoma and Duane Sanders from Ohio. We spent the morning introducing ourselves and watching safety videos in case of emergency on the ship. A ship can be an exciting yet dangerous place to work. There is no ambulance or fire department to call in case of a fire or other emergency. Each member aboard the ship is responsible for not only their own safety, but that of their shipmates also. Above is a photo of Duane and I as we don the safety immersion suits also known as the “Gumby” suit.
TAS Jeff Lawrence and TAS Duane Sanders don their immersion suits during a safety drill.
The suits can be difficult to don but everyone onboard is expected to know how to put the suit on effectively in case of an emergency at sea that may require us to abandon ship. The waters off the northeast coast of the U.S. can still be quite cold even in early summer and hypothermia can set in a matter of minutes.
Bridge of R/V Hugh R. Sharp
Personal Log
The Research Vessel Hugh R. Sharp has set sail for a station about 60 miles due east of Lewes, Delaware. I have been on two other research vessels with the Sharp being the smallest. It is a newer ship and while quarters are quite close they are well maintained and comfortable. The day started out with sunny skies and warm winds. The further out to sea we traverse the cooler the temperature feels as the wind blows across the cooler water. We have just run into a fog bank and there is little to see at the present time.
Skies have cleared off and it is a beautiful day out in the Atlantic. We are sailing to the first station and the crew aboard is getting everything ready for the first tow. There is a lot to do on the ship even when sailing between stations. The crew has to make sure there are not structural, hardware, or software problems before we arrive at the first station. As mentioned earlier I also onboard with another Teacher at Sea participant, his name is Duane Sanders and he teaches at a school near Cincinnati, Ohio. Today has been a great start to the trip with the excellent weather and smooth sailing conditions.
Questions of the Day
What is a Sea Scallop and are there differing varieties or species?
NOAA Teacher at Sea
Susan Smith
Onboard NOAA Ship Rainier
June 1-12, 2009
Mission: Hydrographic survey Geographical area of cruise: Trocadero Bay, Alaska; 55°20.990’ N, 33°00.677’ W Date: June 7, 2009
Sending the CTD to the bottom
Weather Data from the Bridge
Temperature: Dry Bulb 12.8° C (55°F)
Wet Bulb 11.7°C (53°F)
Cloudcover: Overcast 8/8
Visibility: 4 nautical miles
Wind: VRB, light speed
Sea Wave Height: 0-1
Sea water temperature: 9.4°C (49°F)
Science and Technology Log
Today we left Craig to finish our grids in Trocadero Bay, Alaska. It was a time to clean up or capture data from isolated locations which had either been missed or not completely surveyed. For the first few hours we spent our time surveying areas very close to the shoreline and areas very difficult in which to maneuver.
Bringing the CTD back up
We did our first cast with the CTD (Conductivity, Temperature, Depth) equipment and I finally asked if I could run it. Ian, the survey technician, happily obliged. The CTD calculates speed of sound through water. I have finally gotten the gist of sonar settings. The following information will help you understand why it is all necessary for getting accurate data to the surveyor and coxswain.
Range- How long it takes for the sonar beam to go to the bottom and return, or in layman’s terms, tells the sonar when to ping and listen.
Pulse length– Pulse length sets how long the sonar transmits, thus allowing more power to be put out bythe sonar, but it results in decreased resolution. The longer the length of the pulse the lower the resolution, so shorter is optimal. For instance, when going through kelp it should be set at low so the kelp isn’t all being picked up by the sonar beam.
I really enjoyed driving the launch today.
Sonar Beams- There are 512 beams at high frequency (400khz). Low frequency (200 khz) equals 256 beams. There are two yellow gates on the screen which surveyors utilize. One is positioned above the shallow water, one is positioned beneath the deepest water measurement. When in shallow water most surveyors disable them. When in deep water, if the top gate is positioned too low, you lose valuable data on the outer limits. If the lower gate is positioned too low it records too much noise. However, if it is set too high the outer beams are missing and no data is recorded. Surveyors must constantly watch this screen when these gates are active to ensure all data they want is being captured.
The airplane indicates the launch position and the color is the area which has been logged.
The surveyor must ensure the data is placed in appropriate folders, enter data in spreadsheets, and basically keep things running smoothly for the entire time data is being logged. So, in essence the surveyor must watch the sonar screen, set the polygons on the screen for him/herself and the coxswain, continually check the settings, remember to log on for data retrieval and log off when the swath is completed, set the CTD for casts every four hours, and monitor as many as ten folders at one time.
The rule of safety: Never shall safety for life or property be compromised for data acquisition.
The coxswain’s job is to drive the launch into areas to be charted, based on the POD, the Plan of the Day, grids. When data is being recorded he/she drives approximately four to eight knots, depending on the wave action. High swells require slower forward progress. The coxswain has two computer screens-one showing the grid being logged or charted, and another displays depth of water in feet, meters, and fathoms and several other pertinent pieces of data. He or she is ultimately responsible for making decisions about when to enter dicey locations and determining when to stay out of a risky situation.
Seals swimming in kelp
When traveling in either extremely shallow water or water full of kelp and known rocky locations, a bow watch will stand on the bow and give visuals for the coxswain to avoid. Obviously, this person must wear a safety jacket and hold a rope around an arm or wrist, due to the precarious position he or she is in. High swells could cause serious accidents in a second.
Did you know when backing up a launch, sonar cannot penetrate the bubbles formed when the water is getting stirred? The readings inside the launch show the color red, or dangerous zones, because the sonar thinks the boat is at the bottom. As the surveyors and coxswains say, “No worries! We know where we are.”
Question of the day: What is a patch test and why is it run?
Humpback whale photo courtesy of Ian Colvert
Personal Log
Now that I felt much more comfortable with understanding the sonar I was able to relax more on the launch today. Perfect timing, as this was such a great day for biological observations. Five different humpback whales were sighted in the bay with us; in one location two were in position as forward observers on either side of our launch. The last whale we spotted surfaced fairly close to our launch so we had to stop, mainly because the regulations state you must stay 100 yards from humpback whales. This whale went under the launch and surfaced about 50 meters from us. Off and on during the day they would surface in the areas we were surveying so we had to just wait until they moved along.
I also observed at least eight bald eagles either sitting in trees, flying over the water, or harassing the whales. One eagle flew down close to the water and looked as though it was taunting the whale! Then it quickly flew back up to a tree top and perched on a branch. Several eagles would fly off together, separate, then come back together before landing on a tree. Early in the morning we ran into a group of seals swimming around in kelp. They poked their heads out and just stared at us as we drove by. Luckily we saw them in time to slow down, so as to not disturb them anymore than necessary.
NOAA Teacher at Sea
Susan Smith
Onboard NOAA Ship Rainier
June 1-12, 2009
Mission: Hydrographic survey Geographical area of cruise: Trocadero Bay, Alaska; 55°20.990’ N, 33°00.677’ W Date: June 4, 2009
Weather Data from the Bridge
Visibility: 10 nautical miles
Wind: light
Temperature 11.1 C (52 F)
Cloud Cover: FEW 1/8-2/8
A nautical chart indicating underwater cables
Science and Technology Log: Bottom Sampling
This morning I spent time in the Plot Room, and on the Fantail, involved in bottom sampling. The Plot Room has nine work stations with at least two screens per technician. The airplane symbol is the location of the Rainier and the colored dots show locations of bottom sampling areas. One purpose bottom sampling serves is to determine areas suitable for anchoring.
The clamp shell being retrieved
The chart to the right shows there is an underwater cable area (pink dotted lines) from which we cannot take samples, because it could accidently get damaged, thus rendering residents without power. The numbers shown on these When the ship takes bottom samples, from the Fantail, it uses a spring loaded clamp shell device. It is attached to an A frame and uses a winch to lower it into the sea by cable. The operator calls out the depth, using a cable counter, as it is lowered into the water and when it raised. This enables the plot room to know when a sample is coming and it verifies the information received remains accurate.The numbers on these charts indicate water depth in fathoms (1 fathom=6 ft.). As you can see there are drastic dropoffs in some locations.
Identifying the samples: small coarse pebbles
If the cable is not straight down, the ship must move around it, avoiding the screws (propellers) at all costs. When the clamp hits bottom it scoops up the debris under it immediately and is brought back to the surface. When the sample arrives at the top it is shaken to release a majority of the water. Then it must be dismantled to see the solid matter inside. This is a two person job, as it is heavy and impossible to control for just one person. One holds the spring loaded clamp shell, the other takes off the sample section by pulling on either side of the device.
Identification chart for the samples
Because safety is always an issue the clamp must be kept from swinging once the collection unit is removed. The items found in the sampler are placed on the chart (shown to the right) to make sure identification is accurate. The chart is divided into sand, gravel, and pebbles. Each type of rock found is divided further into fine, medium, and coarse. This information is relayed to the plot room where someone labels the survey chart in the appropriate location. In the first four samples green, sticky mud was identified near the coastline of Ladrones Island, Madre de Dios Island, and on the southwestern arm of the Prince of Wales Island. These were deep areas where people are not likely to anchor their boats. In the sixth sample we were in fairly shallow water and sampled gritty sand and small pebbles.
This sample was full of sand and some pebbles.
Sometimes the water arrives only with living things in the sampler. Samples eight through ten provided us with living things. Shells with little creatures inside were found in one sampling, and in another the only item was a black sea star. Finally after three such samples in the same location we moved on to the next location. This is a somewhat tedious process when the samples do not provide a great deal of useful data. However, that in itself gives sufficient information as to what is NOT in a location. Now imagine being charged with this assignment is an area where surveys have either never been done, or it has been decades since the previous survey. Remarkably the survey charts are fairly accurate, even from when lead weights and ropes were used to survey. NOAA certainly has a daunting task when it comes to surveying Alaska.
Personal Log
This sample had only a little black sea star!
Yesterday, and today, allowed me the opportunity to see the technical aspects of the Rainier’s mission. Small sections of the oceans and bays are meticulously mapped and charted for use by recreational boaters, the fishing industry, large shipping companies, and the military. Without the information gleaned by the people and ships of the NOAA Corps our waters would continue to go uncharted, perhaps unused, and remain hazardous to all. I am amazed at the patience needed for this work, but it is well worth their efforts to provide the necessary tools to keep our waterways safe for everyone.
Jack on the bow
I was discussing interesting things I noticed on the Rainier with several of the officers. Did you know there are two flags we fly on the NOAA ships? There is the Jack, a flag with the 50 stars and blue field, and the Stars and Stripes, our nation’s flag. When it is flown on a ship it is called an Ensign. The Jack is flown on the Jackstaff (origin 1865-1895) located on the ship’s bow. The Ensign is flown on the fantail while in port or anchored at sea. I suppose I have now become a student of vexillology, the scholarly study of flags.
