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

Effective Surveying Tool for Shallow-water Zones

Satellite-derived Bathymetry
A recent article provides an overview of satellite-derived bathymetry methods and how data can be integrated into survey campaigns, and showcases three use cases. Bathymetric data in shallow-water zones is of increasing importance to support various applications such as safety of navigation, reconnaissance surveys, coastal zone management or hydrodynamic modelling. A gap was identified between data demand, costs and the ability to map with ship and airborne sensors. This has led to the rise of a new tool to map shallow-water bathymetry using multispectral satellite image data, widely known as satellite-derived bathymetry (SDB). Strictly speaking, the methods to derive information... (read more)
2017-01-04 04:13:14

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

Z-Boat for Shallow-water Hydrographic Surveys

For hydrographic surveys in shallow inshore waters such as rivers, canals, lakes and ponds, access to the site can sometimes be the biggest headache of the entire survey. Driving a boat trailer to the survey site requires a wide access point and a convenient place to launch the boat. The Oceanscience Group (USA) has launched the Z-Boat 1800 portable remotely-operated survey boat that brings high-quality positioning and depth sounder instruments together on a convenient remote platform that can be launched and operated from practically anywhere. The Z-Boat is the first in a new line of remote survey systems to be... (read more)
2012-05-01 03:57:47

An Adaptable Survey ­Platform for Shallow Water

Bathymetric Charting of Nearshore, Harbour, Estuary and River Settings
High-resolution bathymetry and water quality surveys of shallow shelf and inland water bodies are an increasingly necessary part of environmental management with climate change pressures. This paper describes a new method for data acquisition using a small, stable, adaptable, single-operator survey platform. Development and natural (climate related) changes are placing an ever increasing pressure on our coasts, shallow marine shelves, estuaries, rivers, harbours and inland water bodies. In Europe these pressures have been recognised and attempts made to address the impacts under legislation such as the Water Framework Directive, which seeks to classify all water bodies by their health and... (read more)
2013-01-18 01:45:32
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