Towed Current Profilers

Mapping currents in channels and fjords
Over the past decade, acoustic current profiling instruments have proven to be a powerful tool in measuring currents in the ocean, obtaining direction and magnitude of currents in a vertical profile. These instruments use high frequency acoustic backscatter and the Doppler principle to obtain detailed measurements of current velocity profiles. Suspended particles carried by currents in the water produce echoes that are ‘listened to’ by the current profilers in order to obtain current magnitude and direction. The application of this instrument has not been confined to coastal environments; it has been widely accepted within the marine science community. The instruments... (read more)
2008-01-01 01:00:00

Current Profiler Shallow Water

OSIL has recently supplied several SonTek Argonaut-XR (Extended Range) Acoustic Doppler Current Profilers for use in projects where shallow-water current monitoring is required. The Argonaut XR is specifically designed for mounting on the bottom of a river, channel, port or near-shore in less than 40m depth of water. It has a multi-cell current profiling feature that includes special mode which automatically adjusts one of the measurement cells for changing water-level. This means that the Argonaut-XR can adjust measurement volume height to report depth-averaged velocity over the entire water column, or over a user-programmable range (even with tide variation). The Argonaut... (read more)
2005-12-08 12:00:00

Ocean Current Observations

Application of HF-radar in Japan
The Japan Coast Guard continuously operates two types of real-time ocean current observation systems with High-Frequency (HF) radar. These have been operational in the area of Izu Islands since August 2001 and Sagami Bay since August 2002. They were installed to monitor the Kuroshio Current that flows generally from south-west to north-east along the south coast of Japan, and to monitor the coastal current normally flowing anti-clockwise in the Bay, and sometimes clockwise due to inflow from the Kuroshio. The total vector maps produced by each HF-radar are released on the internet (www1.kaiho.mlit.go.jp). The main purpose of this article is... (read more)
2008-01-01 01:00:00

HIPAP Sea Current Meter

Kongsberg Maritime has developed a new system for measuring sea current speed and direction at given points on a drilling riser, which can be integrated with its High Precision Acoustic Positioning and underwater navigation system, HiPAP. The Sea Current Meter and HiPAP package is designed to improve control of drilling operations and has already been delivered to the first user.   The Sea Current Meter package consists of a Doppler Velocity Log (DVL) interfaced to a telemetry transponder, which sends the 3D sea current data via acoustics to the onboard HiPAP system. There are virtually no limits to the number... (read more)
2009-10-20 02:48:10

Current-measurement Technology

Falmouth Scientific, USA, has presented a new generation of single-point Acoustic Current Meter (ACM) technology. The FSI ACM-PLUS offers new features, functionality and benefits that will enhance the ability to measure current speed and direction in 2 or 3 dimensions and display the data in real time or capture it for later analysis. The ACM-PLUS employs Acoustic Phase-Shift Transit-Time Technology, which enables it to operate in very clear as well as turbid water. It has been developed to providing high-resolution current readings at the water surface (e.g. for oil spill tracking) or at deep depths where slow-moving currents are difficult... (read more)
2012-08-03 02:00:00

Ocean Current Technology

Voith Hydro and RWE Innogy have announced the formation of the joint venture of Voith Hydro Ocean Current Technologies. With the new company, both partners will accelerate the development, manufacture and marketing of ocean current technologies.   Within the framework of its venture capital activities, RWE Innogy will make a significant capital investment and hold 20% in the new company. Voith Hydro - which has been active for many years in the research and the development of the emission-free power generation from the oceans - will be the majority shareholder with 80%. The total investment guaranteed by both partners over... (read more)
2009-03-13 02:20:56

Current Measurement Programme Completed

The Norwegian Oil Industry Association (OLF) initiated a current measurement study to increase their understanding and knowledge on metocean data in the Lofoten - Vesterålen area in Nordland county. For this programme MSI deployed 9 separate moorings, each fitted with a current profiler (frequency depending on water depth) and CTD logger. The moorings were serviced at intervals of approximately 3 months using vessels chartered by MSI. The observations will also be given to support the Mareano programme. Some rigs with current profilers are already in place in the area and OLF extended the current programmes with additional moorings.The project was... (read more)
2010-11-08 11:40:09

FlowQuest Current Profiler Sales

The sale of LinkQuest's FlowQuest line of acoustic current profilers has grown rapidly since its introduction. An extensive line of models has been used for a large number of diverse applications worldwide. LinkQuest recently provided Columbia University with a FlowQuest 600 system with WaveQuest directional wave measurement option, bottom tracking option, and Data Fusion function interfacing to a third party sensor and a FlowQuest 300 system with bottom tracking option and Data Fusion function.   These systems, along with previously purchased FlowQuest 600 systems, will initially be used in current and wave studies in Indonesian Seas. All profilers are equipped... (read more)
2008-09-10 10:30:46

Shallow Water Current Measurements

Application of a towed ADP system
Since the management of coastal areas came to the attention of marine science, much effort has been expended in applying originally ‘blue water’ measurement technologies to typical scientific problems in a shallow water environment. For hydrographic investigations in a large but shallow area of the Baltic Sea, a towed current meter system was designed and tested which minimises the limitations of standard vessel mounted ADP application in shallow water conditions. The new system was successfully operated during several cruises in the Baltic Sea. It provides accurate current data in the near surface layer, normally disturbed by the ship induced wave... (read more)
2008-01-01 01:00:00

Current Monitoring around Sand Engine

SeaDarQ organised a test together with the Dutch Ministry of Transport and Water Management on the coastline close to Kijkduin, The Netherlands. The aim was to provide an accurate hydrographic map of currents, depth and waves around the area of the Sand Engine project, where 20 million square metres of sand have been deployed to protect the coastline dunes from penetrating waves. Since the conducted trial was successful, long-term SeaDarQ system testing for the Sand Engine observation project will include building an observation tower for radar. The Sand Engine is an innovative method for coastal protection. The Sand Engine is a huge volume of sand... (read more)
2015-11-26 03:09:56
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