Category: Vessel/Laboratory Page 78 of 89

RV Langseth: Fishing gear

The picture above is an example of a seismic air gun going off underwater and how it produces the sound wave that reflects off of geology well beneath the sea floor.

            Today we calculated that with the area we have covered we would be able to go around the world twice. We have been constantly shooting and recording data. Almost immediately after I posted my last blog we had to pick up the gear again because there was an issue. We noticed that there was a shark bite on one of the cables but that was not the issue. The true issue was that one of the GeoEels was missing. After further investigation we believe that a shark grabbed it and ripped it off. During the process of bringing in the P-cable I was in charge of the spares reel, a 12ft diameter reel that holds all of the eel cables.

            Besides that instance we have had a very relaxed time. The rest of the weekend and beginning of the week went well until today. Today around 4pm we lost communications and data with another eel. With the time constraints we are under the party chief decided that we would keep shooting without one of the eels. We believe that this is partially due to the fishing gear that was caught on our signal cable, bt we can not be sure until we bring the gear up. We also heard that this weekend is going got get rough and we may be picking everything up and heading to port but no one is sure yet. I will try and keep updating.

          

R/V Pelican- The End

Although our cruise was cursed with bad weather, by the end of the two-week cruise, we have received a lot of great data! Our research area consisted of a “box” about 50 miles south of Louisiana in the Gulf of Mexico looking at hypoxic zones from the Missisippi River runoff. At each corner of the box we had a “barney,” which had an ADCP (acoustic doplar current profiler) that records data on the currents in the water column. In addition, each corner had a string mooring equipped with several CTD (conductivity, temperature, and depth) sensors that took samples throughout the watercolumn as well. In the middle of the box, was an optics package which looked at the turbity of the water, another barney, and a wirewalker, a new piece of equipment that uses wave energy to move up and down the watercolumn continuously taking samples of oxygen, chlorophyll, CTD, etc. depending on what instrauments it is equipped with.  

While we left those instruments to collect data throughout the entirety of the cruise, we also deployed a glider, scanfish, CTD rosette, and an optics pacage several times as we cirucited the box. I personally was in charge of the operation of the CTD rosette and got very comfortable working with the program and the instrument itself during my time onboard. By my last week, I had learned a lot from my mentor and from the science team. The last few days were spent retrieving the instrumentation from each of the sites.

We had collected half of the equipment and were on our way to the northern stations when one of the scientists checked the GPS data off of our WireWalker, which we left at the center station. According to the data, 2 hrs before, our WireWalker started moving to the west at 6 knots. Hoping that the GPS data was off, we moved to the center station to search for our gear. After hours of pinging and searching on the echosounder, we were confident that both our WireWalker and the Barney was gone, suspicious that some shrimpers picked them up while trawling. We followed the GPS location for several hours, finally catching up with the boat around midnight. The entire crew and science team were awake and eager to see who had our equipment. We spotted the boat and our captain hailed them on the radio, asking for our equipment back. After a few minutes of “we caught it in our nets fair and square, bub” and “you need to pay for our ripped nets” they finally agreed to give our equipment back when we casually mentioned that we had Navy personnel onboard. In order to transfer the equipment, we had to back into the other ship so both of our sterns were touching, a delicate manoeuver, so our A-frame could pick up the heavy mooring. Finally, after a long day of chasing down “shrimper pirates” we had our equipment (worth about $200,000) back on board with one more day to retrieve the rest of our gear. Unfortunately, after hours of searching the other two stations, it seems like some more shrimpers took one of our string moorings (always have GPS tracker on your gear!)

Despite the loss, we headed back to LUMCON with tons of data and a happy science team. I am so grateful for the time I had onboard R/V Pelican. I learned so much more than I had expected and made some great relationships with the crew and scientists==. 

 

Julianna Diehl

 

After the Healy

Brief update since my Shakedown cruise on the Healy.

– Successfully completed the full inventory on all of the Triaxus boxes that OSU received from Moss Landing.  Meaning that I will be able to start work on the rebuild during my next period of shore leave.  Still not 100% sure where to even start on this project since we appear to have a lot of spare and broken parts. As well as the fact the Triaxus was supposedly customized by the Applied Physics Lab at the University of Washington….and the documentation is missing.  It’s almost like buying a puzzle at the Goodwill and discovering you are missing the crucial boarder pieces.  Luckily I still have the original MacArtney documentation as well as access to some great resources if I need to ask questions. 

 

-Mooring deployment cruise.  Completed a week long mooring deployment cruise for a Naval research group.  Their custom “Quadpods” and ADCP/Temperature moorings will be used to monitor sediment transport along the seabed.  Overall the cruise went well, we finished all the deployments in two days.  

 

-Coring cruise.  As of 0800 this morning we shipped out of San Francisco to begin a sediment coring cruise with a private research group based out of Washington.  This seems like it will be an interesting cruise, albeit a lot of work due to the 24hr ops.  Since the Oceanus only runs one technician generally, true 24 hr ops are not really possibly.  However for this cruise one of the science technicians will spilt a 12hr shift with our marine technician (noon-midnight, midnight-noon) and I will be running from 6am-6pm in order to maintain clear communications between our science party and crew.  

Days of Dredging

The start of the week was uneventful. We Habcamed for a day and a bit until it was time to start dredging. Saturday, the first day of dredging, was marked by hauls filled with sand dollars and some huge monkfish. Sunday was more interesting. The first few dredges were full of shell hash and one in particular was so muddy and huge I had to help sort for twenty minutes. After breakfast, science decided to change out the dredges so that the one currently on deck and the one currently in use switched. They needed to do some repair work to the inner lining of the dredge. That took a good while to maneuver and crane the dredges into place. However, once everything was figured out, the dredges after it were rather fun. One haul had lots of baby monkfish (over ten), one haul had a huge lobster and a seahorse, and one haul had a little, bitty octopus (as pictured above). That little octopus made my week!

Monday was quiet in comparison. The hauls were small and the runs between stations were long (30-60 minutes of downtime). A large, thick haddock was caught in one of dredges and was cooked up for lunch. It made for a good fried fish sandwich. Unfortunately, Tuesday was probably the hardest day of the week. Fog moved in, there was constant precipitation, and the swells had grown. It never graduated into bad weather but it was enough to make the work long and chilly. On the bright side, I saw a mola mola right up next to the ship and some species of sea bird landed and hung around the deck where we were working. It took off after a few minutes before anyone could take a picture. By Wednesday we only had a couple of dredge stations left. I only had to do four dredges before it was time to pull the dredge up and place the Habcam in. We Habcamed all of my Thursday watch as well but by Friday we will likely be back to dredging.

Plans are up in the air for the end of the cruise. We don’t have enough fuel to make it to the end and weather is supposed to get nasty for Sunday. The tentative plan is to refuel Sunday morning and wait for the weather to die down before heading back out. By tomorrow (Friday) there should be a final decision.

Until next week,

Maia

RV Langseth: Mowin’ the grass

I have been very busy this past week learning more and more each day. We are now half way through the cruise and mowing away at the prospect area. My job as an observer is to monitor the guns, streamer, and p-cable. This means that I have to look at 8 different screens to make sure that everything is in working order. When the PSO (protected species observers) spot an animal that we have to power down or shut down for, it is my job to quickly turn the guns off and activate the mitigation gun. This is so we do not have to do a ramp up (gradual increase in noise level) and we can start right back up once the animal leaves the area. This past week I have gotten a lot of practice on turning the guns off and activating them in a timely manner.

            This week we also had and emergency where we had to pull the air-gun string in and do some maintenance. Since it was late at night and people were sleeping I was chosen to suit up and get in the gun slip. The slip is pictured above and while the guns are being pulled in the green safety net is not there. I did however have to wear a plethora of safety equipment, including a 4-point safety harness, work life vest, hardhat, steel-toe boots, and gloves. When the guns are coming in, everyone has to be focused and there has to be clear communication otherwise someone will get hurt. Needless to say we accomplished the maintenance without any issues and we were able to keep shooting soon after.

 

 

R/V Pelican: Waiting on the Weather

Week 1 of my MATE internship down and I’m eager to get back out into the Gulf. The Pelican is currently being chartered by the Naval Research Labratory, (NRL) who are conducting research to test the accuracy of Satelite monitering. Our four stations are layed out in a box pattern in the upper, Northern part of the Gulf of Mexico. At each station, a mooring and a string mooring is deployed to moniter conductivity, temperature, oxygen content, chlorophyll content etc. along the entire water column. In the center of the box, what we call “C1” is a wirewalker and another mooring. The wirewalker uses wave generated power to slide down a cable, taking samples of the water column. We’ve also deployed a scanfish takes transect measurements as we circle the entire box. Unfortunately, there’s a tropical depression forming off the Gulf, which has brought swells of 5-6 feet, which hinders the deployments the scientists can do. So for now, we are back in Chauvin, Louisiana waiting out the weather. The forcasts say the weather seems like its going to stay strong throughout the entire week, however it seems like to me the weather in the Gulf changes on a dime, so we will see if it holds out. Hopefully it doesn’t becuase I want to see some gliders deployed! 

The crew and the science team has been very easy to get along with! By the third day of being here, I’ve been running my own CTD watch, being in charge of the computer program as well as deck operations relating to the CTD. I’ve also been able to help the scientists a lot, helping to attach sensors to their instruments and helping them get the information needed back to their computers and labs. Looking forward to my last week on this internship. 

 

Julianna

Dredging, Whales, and the Last Leg

This past week been exciting! On Friday we dredged the whole day but this time we were getting lots of scallops. For one memorable dredge, there were so many scallops that they overflowed the net. The scallops were the size of dinner plates and were covered in muck. The dredging however was interrupted the next few days due to weather. Bad weather was supposed to move in where we were for the weekend. In particular, the wind was supposed to pick up to around 20-30 knots. In order to stay safe, we spent the first half of Saturday steaming over to the water near Nantucket. The idea was that instead of being stuck over 100 miles off shore in bad weather, the area around Nantucket was close to shore and could buffer storms. Once we arrived at Nantucket we continued to dredge as to not waste time. Personally, most of my watch that day was spent waiting for arrival but I did have some rock filled dredges towards the last few hours of my day. While waiting around, I noticed that there were many, many whales. While in the past weeks whales were not uncommon, that day in every direction I looked I could see at least one whale. There were more than whales as well. I saw seals, dolphins, and sharks too. It was incredible and time flew watching them. Unfortunately, I was unable to get any good pictures.

The next few days were spent dredging around Nantucket and the occasional Habcaming. On Monday we had particularly bad luck with dredging.  There were multiple hauls that consisted of huge mounds of sand dollars or brittle stars. Anything other than scallops, fish, and one species of crab is considered trash and is duumpted over the side. One dredge broke the record for bushels of trash with 49 bushels of sand dollars. Those types of dredges and the dredges with rocks are the hardest and most backbreaking type of haul so Habcaming was a well needed break.

On Tuesday we pulled up the Habcam and steamed back to Woods Hole. We arrived at around 6 pm and I grabbed dinner at a local café. We spent the whole of Wednesday mobilizing. Most of the time was spent trying to install a new washer and dryer as ours had broken down a couple days prior. This was a large undertaking since the laundry machine didn’t fit through the doorways. Instead, they had to be craned through a hatch. Like all days on land, we worked from 7 am to 3 pm. At the end of the workday, I took the ferry over to Martha’s Vineyard to visit a friend from college who lives there. Bright and early this morning we left Woods Hole and started Leg 3 of this scallop survey. Today was entirely spent steaming out to the first station. I have to look forward to over 100 dredges by the end of the trip as science wants to do 70% dredging and 30% Habcaming.

See you next week,

Maia

RV Langseth: Data Rolling in

This week has been a difficult learning experience. Working 12 hour shifts can be very difficult and hard on the mind. At this point I thought that we would have been up and running without any interruptions, but it has been full of small issues and quick problem solving. Over the past week we have had 3 separate times when we had to power down due to a protected species in our area. All of these instances involved turtles being in the area.  During this time we are required to only fire the 40 in3 mitigation gun. This allows us to stay online without hurting the animals or having us completely shut down. We also had other problems with the P-cable not recording data properly and one of the EELs (p-cable streamer) on the  cross cable not functioning. These errors were generally fixed within several hours of them being present. Even with all of these issues, about 15% of the prospect area has been successfully completed.

             At this point I could safely and efficiently perform the duties of an observer after spending over 75 hours watching and training. I also spent time working with the gun mechanics this week. I got my first try at welding while on a boat. As you can imagine it is much more difficult than welding on land because you must move with every pitch and roll of the ship. I have also found my regular spot for recovery and deployment of the gear. When deploying or recovering the doors my job is controlling the wide tow winch and helping to handle the lift lines.  I have started to get an understanding of why we are out here doing this survey and how everything works. Everyone on board that I interact with has been very helpful and welcoming even though I am new to the vessel. One of the largest morale boosters is the food! Every night we have had some type of meat and fish along with vegetables and dessert of course.  My next few weeks will be focused on learning the navigation and data processing side of the operation.

RV Langseth: First week out at sea

This past week has been very busy. We spent all weekend getting ready to head out on Monday. I spent most of my weekend rebuilding the air guns. We were able to leave port about 9 am on Monday morning. While transiting to the survey site we deployed the cross cable, doors, and head floats. The doors are 4m tall floats that have fins designed to spread the cross cable to cover the intended area. While deploying and recovering the doors my job was to help disconnect the lift ropes and then run the 50 Ton winches that let the doors out and in. We were able to fully deploy the p-cable and streamer on Tuesday but we had to fix a few issues. Last night I got my first try as a data acquisition technician. This means that I was in charge of making sure the guns were firing at a proper rate and also logging any shots that were missed or not recorded.

            One of the best things about living on a boat is the food. Every night we have had a different meal. We have had everything from fish, steak and scallops, to chicken, potatoes, and pie. I will try and post next Wednesday but it depends on how well the mission is going.

Fun with Dredging

         The dredging has set in full force. We dredged for three days nonstop save for the occasional repair to the dredge. My job is assisting in bringing a dredge up out of the sea onto the table, dumping the contents, and setting it it back out again. Once a dredge is completed the deck has to be washed down with the seawater hose as there is a surprising amount of organic debris left from the dredge. A dredge takes around an hour to complete depending on what we catch. The ease of the dredge entirely depends on what is hauled up. Those that are filled with large rocks, are sandy or muddy, and those that are extremely large in quantity are the hardest to shovel and sort. I’ve seen all sorts of amazing creatures that were caught in the dredge. Not only have there been scallops, but I have seen octopuses, squid, mussels, monk fish, skates, hermit crabs, sand dollars and sea stars at the top of my head. The first few days of the week were consumed by continuous dredging and made for quick but arduous watches.

         Shortly into the beginning of my watch on June 1st, we did one last dredge before we secured the dredge on deck. It was time to head into Woods Hole, MA to refuel. We steamed into port at around 9:30 am and had a couple of hours off until it was time to head out again. Before I could go and explore the town, we had to dump the garbage. This was a fun process of chucking trash bags over the side of the Sharp onto the dock where the bags were then brought to the trash bins nearby.  I enjoyed wandering the town and in particular enjoyed the food and coffee at a cafe called Pie in the Sky. All too quickly, it was time to head back to the ship and we were off by noon.

            The next watch, the midnight since leaving Woods Hole, the sea had picked up considerably and there were strong winds. We were not able to dredge in this weather and all we could do for hours was wait for the weather to die down. By daybreak the seas had calmed and we were able to place the Habcam in the water. As Habcaming requires nothing of the techs, the day was spent peacefully and quietly up in the bridge. The peace was broken by the time my next watch began on the 3rd. When I woke up we were back to dredging since the one of the computers of the Habcam had broken. One of the dredges we pulled up that early morning was of note, we had caught ourselves an old lobster trap, two lobsters included! After breakfast we got great news from science saying that they fixed the computer and the Habcam was ready to be put back in. Once it was deployed, there have been no further issues and we have been Habcaming up until today. Tomorrow we will be back to dredging but we had a certainly had a nice break.

See  you next week,

Maia

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