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December 2017 Issue

Instrumentation for Students
To Study Sedimentation Process

Students from the School of Ocean Sciences at Bangor University have a 30-year tradition of heading to the Laugharne Estuary in south Wales each summer to investigate the sediment dynamics of this energetic environment. Survey data, collected by successive generations of students over this period, indicate that the estuary is infilling with fine marine sand at a rate of 1 to 2 cm per year.

The sediment transport results primarily from strong asymmetric tidal currents causing the influx of sand from Carmarthan Bay on the dominant flood tide.

Additionally, locally generated wind waves in the shallow estuary may contribute at different frequencies and complicate the overall picture.

A newly introduced exercise utilizing Nortek’s Doppler instrumentation is helping the students to understand the processes behind this long-term trend in sedimentation.

The Nortek Vector Doppler velocimeter, together with an externally mounted optical backscatter sensor and a pressure transducer, illustrates the temporal patterns of sediment flux to the students.


Successful Second Teledyne
Workshop in San Diego

Teledyne Marine hosted the second biennial Teledyne Marine Technology Workshop in October in San Diego, California. A record-breaking 270 customers from around the world attended.

The keynote speakers were Oliver Steeds, founder, chief executive and mission director of Nekton, who gave an inspired speech on new deep-sea discoveries and industry’s responsibilities as stewards of the oceans, and Margaret Leinen, director of Scripps Institution of Oceanography, who presented an overview of the challenges facing the oceans and political progress. The workshop included more than 40 product and software introductions and training classes; 12 dockside demos; two boats running 24-hour on-water demos; 14 industry partners and suppliers as exhibitors/sponsors; and networking events.


ClassNK Type Approval for
Ship Maintenance Software

Helm Operations has earned class type approval for its planned maintenance software, Helm CONNECT, from ClassNK, which is a member of the International Association of Classification Societies (IACS), whose members recognize and accept type approvals from other society members, thereby allowing any shipowner to implement the Helm CONNECT software as a planned maintenance tracking system.

This type approval now makes it possible for Helm Operations to expand into the much larger blue-water shipping industry.


Li-S Battery Achievement
For Deep-Ocean Applications

A consortium comprising Steatite, OXIS Energy, MSubs and the U.K. National Oceanography Centre has achieved what it set out to do by developing a pressure-tolerant lithium-sulphur (Li-S) battery that’s capable of powering autonomous vehicles to ocean depths exceeding 6,000 m.

The cells can withstand the extreme pressure of 664 bars at a temperature of 4° C.

They achieved 289 Wh/kg at a pressure of 450 bars.

The gravimetric energy density of the complete battery is 184 Wh/kg.

Due to the neutral buoyancy of the cells and battery, buoyancy foam can be reduced in the vehicle, saving cost, weight and volume. MSubs has integrated the battery to power a test ROV supplied by Deepbots AS.

As the OXIS chemistry continues to mature and improve in terms of gravimetric energy, greater gains will occur in battery pack performance.


Modular Unmanned Vehicle
Under Development

A team of engineers from thyssenkrupp, Berlin Technical University, the University of Rostock, ATLAS ELEKTRONIK and EvoLogics is now working together to develop a new type of UUV.

The Large Modifiable Underwater Mothership (MUM) project will receive funding from the German Federal Ministry for Economic Affairs and Energy over three years.

It will open up new ways to explore and harness the potential of the world’s oceans.

MUM is breaking with old conventions: The modular, unmanned underwater vehicle performs its tasks mostly autonomously.

Individual base modules can be freely combined with specific mission modules to form large systems, enabling even unusual and highly specialized tasks to be performed quickly and easily.

Possible activities range from payload transportation and operations to research missions and stationary deep-sea tasks.

This makes the vehicle ideal for use in offshore energy, deep-sea mining and maritime science.

The emission-free fuel cell propulsion system permits long ranges and deep diving depths and makes the vehicle ideal for use in highly ecologically sensitive environments.

Project partners are targeting market readiness by 2025.

Research and development work is expected to be completed by 2020, with a 1:5 scale model built and tested.


Darley Becomes US Distributor
For Aquabotix

UUV Aquabotix Ltd. has added W.S. Darley & Co., a 100-year-old designer, manufacturer and distributor of firefighting, defense and emergency services equipment, as a distributor for Aquabotix in the U.S.

Through this partnership, Aquabotix will work closely with Darley Defense, a specialty division of Darley that focuses on marketing new and existing products to the U.S. Department of Defense, to provide its underwater vehicles and camera systems to the U.S. Navy.

Aquabotix’s portable Hybrid AUV/ROV and Endura ROV are both designed to aid navies by identifying and addressing increased underwater threats.

These threats often occur in hazardous environments that are difficult and dangerous for divers.


2018:  FEB | MARCH
2017:  JAN | FEB | MARCH | APRIL | MAY | JUNE | JULY | AUG | SEPT | OCT | NOV | DEC

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Sea Technology is read worldwide in more than 115 countries by management, engineers, scientists and technical personnel working in industry, government and educational research institutions. Readers are involved with oceanographic research, fisheries management, offshore oil and gas exploration and production, undersea defense including antisubmarine warfare, ocean mining and commercial diving.