Sea Technology

AUG 2017

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16 st / August 2017 already installed in Chilean ports. Mari- scope has supplied Nortek's AOS and AWAC systems to nearly every Chilean port from Arica in the north to Punta Are- nas in the south. The result is fewer ac- cidents and speedier entrances and exits for port-bound ships, both of which present significant cost savings. As a leading producer of copper, Chile has a number of ports specifically servic- ing the copper mines that can accommodate bulk carriers. These ports are par- ticularly affected by huge waves. By accurately mea- suring waves, it is possible to predict the arrival of such a wave and preempt delays by closing the port. That sort of planning ahead saves time and money. These ports rely on the AOS system combined with the AWAC, and together they are a vital aid for navigation and operations in ports. All Nortek's AOS and AWAC systems installed at copper ports are in constant use. The technol- ogy provides information on waves and currents that ship pilots rely on. The AWAC has become the stan- dard reference technology in submerged wave-measurement applications. With a 35-m maxi- mum range for wave measure- ments and 4-Hz sampling of the surface elevation, the 1-MHz AWAC is a good tool for shallow current and wave measurements. It can be used both with fixed frames and subsurface buoys. The AWAC is unique in its ability to ac- curately resolve waves from very shallow waters to the ex- tremes of the continental shelf. The Need for More Data The expansion of the Panama Canal in 2016 created a third lane of traffic and doubled the waterway's cargo ca- pacity. It also resulted in locks that are 21 m wider and 5.5 m deeper than those in the original canal. It can now take ships that are 330 m long, reaching a depth of 16 m. With these vessels passing through, several South American ports need to be enlarged. But even when the ports are big enough, they can still have problems with safety. AOS and AWAC systems can have a key role to play by assisting safe operation of ships in these ports. Measuring waves and currents will be increasingly im- portant to ports along the entire Chilean coast, as well as aquaculture in the south of Chile as the frequency of huge waves several meters high generated by ocean storms con- tinues to rise. A decade or so ago, such waves hit the shore just two or three times a year. Now, they are happening two or three times a month. These waves are often too high for ports to operate when they appear, which affects many sec- tors, particularly copper. ean aquaculture can partly be put down to the widespread use of top-of-the-range technology. In Norway, many fish farmers have installed perma- nent measurement systems that supply constant, real-time data that allow for much more informed decision making. Nortek has supplied approximately 300 AOS (or Realfish) systems to Norway's fish-farming sites. The Nortek AOS system offers online access to data on oxygen, salinity and temperature, as well as ocean currents and wave data from any coastal location. It does not require significant engineering resources, and, once deployed, the system will be up and running in a matter of minutes. It transmits data collected via satel- lite to software developed specifically for the aquaculture industry. This whole system generates daily reports so that fish farms can document that they operate according to standards set out by governmental and nongovernmental organizations, such as the Aquaculture Stewardship Coun- cil (ASC). There are at least 100 ASC-certified fish-farming sites in Chile, most of which would become more efficient by adopting the AOS system in combination with current profilers. Meeting the Depth Challenge Like Norway, Chile has very deep fjords, but it experi- ences stronger currents and stronger winds. As we have discussed, reliable and constant measurements of these cur- rents can markedly improve the performance of fish farms. But it can be particularly challenging to achieve accurate measurements in deep fjords. Nortek's Signature range of ADCP instruments include current profilers with broadband capacity that offers a high- er resolution and a longer range than competitors, resulting in reliable data at depth. This is all achieved on a power consumption 90 percent lower than standard products, us- ing internal batteries. Lessons from Chilean Ports The aquaculture industry in Chile may benefit greatly from considering the success of AOS and AWAC systems (Top) Designed for simple yet powerful operation, the Aquadopp current profiler is packed with features used by engineers and researchers for hydrodynamic data collection in a variety of environmental conditions, including at fish farms. The Aquadopp is used in aquaculture to optimize production and operations. (Bottom) Nortek's Realfish sys- tem (AOS) gives online access to monitoring of currents, oxy- gen, salinity and temperature.

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