Archive for the ‘Fairweather’ Category
From surveying our most northern Alaskan waters last year, to our southern coastal waters this year, NOAA Ship Fairweather has really been making the hydrographic rounds, so to speak. This month, Fairweather’s hydrographic work is reaping benefits for the maritime industry in Los Angeles and Long Beach.
Fairweather is surveying this area in response to requests from the Port of Los Angeles, the Port of Long Beach, and the pilots who maneuver increasing large oil tankers and cargo ships through the area’s crowded shipping lanes. This project will acquire data for comprehensive updates to NOAA nautical charts 18749 and 18751, which provide the depth measurements and aids to navigation that mariners rely on for safe transit. Fairweather last surveyed the area in 1975, and NOAA contracted for a small survey in 2000.
This chart shows where NOAA Ship Fairweather is surveying.
This project undertakes surveys encompassing 114 square nautical miles. Of those, NOAA considers 89 SNM as critical to safe navigation and therefore a NOAA priority. The survey areas include San Pedro Bay and its approaches, stretching south to the waters off Huntington Beach and Newport Beach.
Capt. Kip Louttit, executive director of the Marine Exchange of Southern California San Pedro, presents a certificate of appreciation to Fairweather‘s commanding officer, Cmdr. James Crocker. Photo courtesy of Capt. Kip Louttit
Retired Coast Guard captain J. Kip Louttit, executive director of the Marine Exchange of Southern California San Pedro, visited the ship last week to thank the “great ship and crew [for] doing an incredibly necessary survey for the ports.”
The Fairweather usually operates in Alaskan coastal waters and, last year, conducted a noteworthy hydrographic reconnaissance along the U.S. coast in Arctic waters to determine the priorities for updating Arctic charts. Fairweather is part of the NOAA fleet of ships and aircraft operated, managed, and maintained by NOAA’s Office of Marine and Aviation Operations, which includes both civilians and the commissioned officers of the NOAA Corps, one of the seven uniformed services of the United States. The ship is homeported in Ketchikan, Alaska.
NOAA Office of Coast Survey has released a new nautical chart for the Arctic, which will help mariners navigate the Bering Strait. Chart 16190 (Bering Strait North) incorporates precise depth measurements acquired recently by NOAA Ship Fairweather hydrographic surveys.
Coast Survey has also released a new edition of Chart 16220 (St Lawrence Island to Bering Strait).
“Our Arctic Nautical Charting Plan identified the need for 14 new charts in the Arctic,” explains Commander Shep Smith, chief of Coast Survey’s Marine Chart Division. “Chart 16190 was high on our list of priorities, since the Bering Strait is the maritime gateway from the Bering Sea in the Pacific Ocean to the Chukchi Sea in the Arctic Ocean.”
“Charting the gateway is absolutely vital for safe navigation, but it is more than that,” Smith says. “In addition to the very practical aspects, this chart also symbolizes an opening to the growing opportunities for maritime transportation in the Arctic.”
Charts 16190 and 16220 include recent hydrographic information in U.S. waters between Cape Prince of Wales and the immediate waters surrounding Little Diomede Island. They also include recent NOAA shoreline surveys of the Diomede Islands and Cape Prince of Wales.
NOAA Chart 16190, Bering Strait North
Chart 16190 provides 1:100,000 scale coverage, including a 1:40,000 scale inset of Little Diomede Island. Chart 16220 provides 1:315,350 scale coverage. Prior to these charts, the best available information was from Chart 16005, at a scale of 1:700,000. At that scale, every charted depth was separated by about two nautical miles and the chart depicted only a handful of depths. Most of the old charted depths were from 1950 and provided incomplete information about the depths or possible hazards on the sea floor.
Chart 16190 is the second new chart resulting from the Arctic Nautical Charting Plan. Coast Survey created the first of the new Arctic charts, Chart 16161 (Kotzebue and Approaches), in April 2012. (See New Alaska navigational chart makes increased Arctic shipping safer.) Chart 16220 had previously been maintained by the National Geospatial-Intelligence Agency, but Coast Survey assumed responsibility for it in 2010.
The equivalent NOAA electronic navigational charts (NOAA ENC®) for 16190 will be available this summer. Watch for US4AK8D (Bering Strait North), and US5AK8D (Little Diomede Island). The 16220 ENC equivalent — US3AK89M — was created in 2012 and included the new Fairweather hydro.
Coast Survey’s Marine Chart Division is responsible for updating the nation’s 1,023 nautical charts. Chart 16190 was compiled by Kieumy Dinh and reviewed by Eric Wallner, under the management of Andew Kampia. Chart 16220 was updated by Pravin Shrestha (compiler) and Yan Xu (reviewer).
Today’s post is written by a guest blogger, Dr. Bob McConnaughey. Bob is the FISHPAC project chief scientist, with NOAA’s Alaska Fisheries Science Center.
Fishery biologists and hydrographers in NOAA are working together to solve two very important problems in the eastern Bering Sea. This area is one of the richest and most productive fishing grounds in the world. Careful management of harvest levels is one part of the effort to sustain these populations into the future. However, it is also important to understand the habitat requirements of the managed species so we can protect the foundation for these high levels of production.
To this end, a team of scientists at the Alaska Fisheries Science Center (AFSC) is developing mathematical models to explain the distribution and abundance of groundfish, such as pollock and cod, and benthic invertebrates, such as red king crab, in order to determine their essential habitats. The research team gathers new environmental data at locations where other AFSC scientists sample fish populations during annual bottom-trawl surveys. In many cases, existing habitat information is very limited, but studies will identify useful variables and the best tools for measuring them over large areas of the continental shelf.
NOAA hydrographers working in Alaska are likewise challenged by the sheer size of the offshore areas and the dearth of recent depth measurements. This region includes over 47,000 miles of coastline and roughly 70% of the nation’s continental shelf. Soundings data for nautical charts are usually quite old and coverage is incomplete. Similar to the habitat studies, there is a great need to gather new data, efficiently and cost-effectively.
A diverse team of NOAA personnel and external partners are collaborating to address the critical need for new habitat data and new hydrographic data from the eastern Bering Sea. Beginning in 2006, NOAA Ship Fairweather has conducted multi-mission cruises to simultaneously achieve these two objectives. The so-called FISHPAC project has developed procedures to collect acoustic backscatter data to characterize seafloor habitats while also collecting high-quality bathymetric data for updating nautical charts.
This joint effort has been a great challenge for two groups that have typically worked alone, generally focusing on a single specialized activity. The successful integration of these activities makes efficient use of valuable ship time and will ultimately increase the amount of data collected for both purposes in a single survey season.
The prototype long-range side scan sonar is prepared for deployment. An emergency locator beacon is activated to help locate the towfish if it becomes detached from the double armored tow cable.
The AFSC scientists have introduced new types of equipment on Fairweather for this work, including a prototype side scan sonar capable of very broad coverage (up to 1 km) at a fast tow speed (up to 12 kts), an acoustic underwater tracking system that provides accurate positions for towed instruments, and several “groundtruthing” instruments to help interpret the backscatter data for habitat purposes. The partners have worked out safety and deployment details, and now the ship can simultaneously acquire acoustic data from the ship’s two multibeam echosounders and a towed side scan sonar, while underway and collecting sound velocity profiles and geotechnical data from the seafloor with a free-fall cone penetrometer! Operating this way, the ship does not need to stop; they can conduct survey operations around the clock during the entire time at sea.
Fairweather hosted a major FISHPAC cruise during July-August 2012. A team of 12 scientists joined the Fairweather’s standard crew of officers, physical scientists and seamen to conduct a combined fish-habitat and hydrographic-survey effort in the eastern Bering Sea. The group worked together ‒ night and day ‒ to acquire the multi-purpose data. They tested five different sonar systems in an experiment designed to identify the most cost-effective system for characterizing the seafloor and improving the existing fish-habitat models. At the same time, the ship collected over 1,000 nautical miles of hydrographic data in an area with outdated or non-existent information.
Technicians from the Naval Undersea Warfare Center (Keyport, Washington) and a retired NOAA engineer and hydrographer provided valuable assistance.
Neither high seas, nor fatigue, nor equipment problems stopped the intrepid group. The project was fully successful in the end and Fairweather safely returned to port in Dutch Harbor, Alaska to discharge some scientists and then head back out on her Arctic Reconnaissance voyage.
The towed auto-compensating optical system (TACOS) is a two-part towed video system consisting of a weight sled connected to the ship’s fiber optic winch, with a camera sled trailing approximately 20 meters behind the weight sled. The camera sled includes an analog video camera, a digital video camera, six high intensity discharge lights as well as an acoustic release/buoy for emergency recovery. TACOS creates high-quality downward-looking video mosaics.
This week the NOAA Ship Fairweather is completing her 30-day hydrographic reconnaissance survey in the Arctic. The crew’s personal observations during this successful cruise brings home the importance of measuring ocean depths and updating nautical charts with precise and accurate modern data. Ensign Owen provides Fairweather’s last blog post for this project. - DF
by Ensign Hadley Owen, NOAA, Junior Officer, NOAA Ship Fairweather (S-220)
1200 hours, Sunday, August 26, 2012:55°57.2’N 166°01.2’W, Bering Sea, approximately 100 nautical miles north of Unimak Pass
We are back in the Bering Sea, sloshing around amongst multiple low pressure systems on our way back south to finish out the Fairweather’s 30-day Arctic recon. While it has appeared a lonely transit at times, our AIS (Automatic Identification System) has proved that there are others along this Bering/Chukchi/Beaufort Seas route who will benefit from the updated hydrographic data we are recording.
We have seen more than 50 vessels over the past few weeks, including tugs and towing vessels; cargo ships; fishing vessels; tankers; research ships; U.S Navy and U.S. Coast Guard vessels; and even a couple of small passenger vessels. The ships have ranged from 12 meters to over 200 meters, with drafts of up to 15 meters.
We met mariners with a boat – essential to the region’s economy – whose crew has had frustrations with inaccurate charted soundings. The Greta Akpik is a lightering vessel operated by Bowhead Transport Company. The Fairweather stopped mid-trip outside of Barrow in order to disembark three scientists who were returning home, as well as to pick up stores to provide the remaining crew with food and supplies for the second half of our trip. As the town of Barrow does not have pier facilities, residents depend on the services of shallow-draft lightering vessels to transfer supplies between ships and shore. In casual conversation, the crew of the Greta reported soundings on a chart marked at 30 feet which in actuality read 5 feet on their depth-sounder – a somewhat nerve-wracking discrepancy but not impossible for their shallow-draft vessel. However, this kind of variation can prove a significant deterrent to other maritime traffic looking to enter the region.
Two examples of this “other” traffic that we encountered near Barrow were the 194-passenger Hanseatic and the 165-stateroom The World. Both vessels are considered luxury expedition cruise ships, offering their patrons unique opportunities to visit the world’s last remote outposts. The Hanseatic was on a 27-day trip from Nome, Alaska, to Reykjavik, Iceland. The World is a “privately-owned, residential yacht” for 130 families who collectively chose their vessel’s annual destinations. Both were traveling along the North Slope of Alaska, preparing to transit the Northwest Passage en route to the Atlantic Ocean. In addition to bringing a modest level of tourism to the area, these expedition cruise ships also serve to increase the world’s awareness of the rarity of these remote Arctic Alaskan communities. They mark the beginning of increased and wider interest in the accessibility of the area and the ease with which services can be obtained.
Even with this level of traffic, we are quickly reminded of how much the area’s nautical charts need to be updated, as we transit across a 28 nautical mile square region, south of St Lawrence Island in the Bering — which is totally lacking in soundings. To date, vessels have operated safely by relying on a great degree of local knowledge and nautical good sense. Our recent transit, however, has not only emphasized the degree to which our charts of the area need to be updated, but reminded us of the range of traffic that will benefit from these corrections and additions.