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 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

Very Shallow-water Bathymetry

The River Murray Operations Unit (RMOU) of the South Australian Water Corporation surveys very shallow waters, a type of surveying that has its own specific problems overcome by non-conventional solutions. This article was submitted by a surveyor from the above survey unit. I attended the Shallow Water Survey conference in Sydney in 2003 because that is what I was doing: shallow-water bathymetry - in fact, I was even doing it out of the water. To my surprise, shallow water seemed to be considered as something at about the 10 metre mark or a bit less; 10 metres, to me, was... (read more)
2008-01-01 01:00:00

Cable Tracking in Shallow Water

Tailoring Systems for Inshore Operations
Whilst there has been an increased effort to resolve the issues of supporting deepwater construction operations, issues specific to shallow-water operations seem to have been largely overlooked, the attitude being that standard equipment packages would be perfectly adequate. What makes this all the more surprising is that the majority of offshore developments have some sort of shallow-water requirement associated with beach landing points. As always, the other factor driving all developments is cost. Whilst the high price of oil has produced a boom in oil-construction support, the laws of supply and demand have increased vessel and service provision rates to... (read more)
2007-05-31 12:00:00

Shallow-water Survey in Canada

The St. Lawrence River channel operations
Canada is the second largest country in the world, with a shoreline measuring approximately 243,800km, more than six times the circumference of the Earth. The Canadian Hydrographic Service (CHS), established in 1883, is divided into four regions better to serve this immense territory. Shallow-water surveys take place in all four regions; however, one of these has the most intense operations: the St. Lawrence channel in the Québec Region. The Canadian Hydrographic Service based at Maurice Lamontagne Institute, in collaboration with the Canadian Coast Guard, is working to improve the efficiency and accuracy of these shallow-water survey operations. This paper presents... (read more)
2008-01-01 01:00:00

Very Shallow Water Survey - A New Approach

Multibeam Echo Sounder and Terrestrial Laser Scanner Data Comparison
Hydrographic surveys in very shallow waters can have several applications such as nautical chart updating, performing environmental monitoring and characterisation, determination of dredged volumes, establishing navigational channels or defining general coastlines. When full bottom search is required, surveys in such areas will involve many hours of work, require several specialised technicians and, in most cases, the use of expensive equipment. Therefore, in order to gather coastline altimetry data, many hours can be spent conducting survey lines with GNSS equipment, sometimes in unfriendly and rough terrain. In order to find a way to optimise these tasks, Leica Geosystems Portugal (LG) and... (read more)
2015-10-12 03:54:25

EIVA Day Brazil 2016 - Shallow water solutions

At the EIVA Day Brazil 2016 on 21 June in Rio de Janeiro, we'll take you through the solutions dedicated to shallow water jobs. The common denominator of all these solutions is that they are the result of more than 35 years' experience in developing software for subsea and above-water operations so they make the most out of the hardware solutions in play. The agenda covers a walkthrough of the relevant features. Also, we'll take you through specific usage examples, illustrating how our solutions are used by some of the major players in the shallow water and offshore industries. (read more)
2016-05-26 01:20:35

AAM Launches Shallow Water Survey Service

Geospatial services company AAM, headquartered in Australia, has launched a dedicated shallow water survey team, with hydrographic surveying expert Andy Waddington appointed to lead the team. Under Waddington’s leadership, the newly formed team will provide innovative geospatial solutions to support government, environment, resources and infrastructure projects in shallow water environments. The announcement follows AAM’s merger with Vekta in April 2013 and represents another investment in Australia’s fast-growing geospatial sector. A former ship’s captain in the Royal Navy, Waddington has been active in the development of bathymetric Lidar and remote sensing surveying techniques, particularly in shallow water and the near-shore region.... (read more)
2013-05-13 02:12:58

Land and Sea Shallow-water Mapping

Optech, Canada, is releasing a compact shallow-water mapping solution for its line of ALTM Airborne Laser Terrain Mappers. The new ALTM Aquarius provides simultaneous terrestrial and water-depth measurement capability, enabling the collection of datasets that span the entire land-water interface to depths in excess of 10 metres. Available as a simple sensor head addition to the ALTM Gemini product line, or as a complete survey solution on its own, Aquarius offers a new capability to traditional airborne surveyors looking to add further value to their map product deliverables while maintaining their existing ALTM planning and processing workflows. According to Michael... (read more)
2011-06-01 09:20:04

Multispectral Lidar Solution for Shallow-water Surveys

Leica Geosystems and Airborne Hydrography AB have presented Chiroptera II, a Lidar solution for topographic mapping and shallow-water surveying in depths of up to 15 metres. The system simultaneously captures the full waveform in both the 35kHz bathymetric channel and the 500kHz topographic channel to provide high-detail maps for environmental and coastal monitoring, infrastructure planning, and other near-shore applications. The latest version incorporates the Leica RCD30 80-megapixel medium-format camera, NovAtel SPAN GNSS-IMU subsystem, Leica MissionPro mission planning software and Leica FlightPro flight navigation software. It also features a new scanner package that allows installation in the Leica PAV100 stabilised mount,... (read more)
2014-02-25 03:58:23
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