MARINE SURVEY

MARINE SURVEY

Global Construction Solutions provides a full suite of Marine Survey services including single beam and multibeam bathymetric surveys, scanning sonar and multibeam imaging surveys, side scan sonar surveys and marine geophysical surveys.

MARINE SURVEY

GCS is able to offer a variety of services and carry out projects of various sizes to clients at home and abroad, thanks to our multidisciplinary experts and cutting-edge technology. Recognized for our rapid mobilization of field teams and capacity to successfully complete mandates, we are ready to tackle projects year-round. Whether for environmental purposes, for hydroelectric power plants, bridge structures, mining projects, or coastal and marine engineering projects, we are confident that our team will be able to meet your needs and exceed your expectations.

The hydrometric and bathymetric team places quality at the forefront and strives to provide strict control and quality procedures by employing new technologies such as the newly acquired multi-beam echo-sounder and high-performance instruments that accurately create and update wide strips of seafloor maps. This state-of-the-art technology is particularly valuable for hydrography, dredging control, research work, and 3D acquisitions of submerged vertical surfaces (sheet pile toe, sheet piles, wharfs, foundations, etc.)

Bathymetric surveys allow us to measure the depth of a water body as well as map the underwater features of a water body.  Multiple methods can be used for bathymetric surveys including multi-beam and single-beam surveys, ADCPs, sub-bottom profilers, and the Ecomapper Autonomous Underwater Vehicle. We use bathymetric surveys for many different types of research including flood inundation, contour of streams and reservoirs, leakage, scour and stabilization, water-quality studies, dam removal, biological and spill, and storage and fill in reservoirs and ponds.

Bathymetric surveys allow us to measure the depth of a water body as well as map the underwater features of a water body. 

Multiple methods can be used for bathymetric surveys: 

  • Multi-beam surveying: A multibeam echo sounder attached to a boat sends out a wide array of beams across a “swath” of the waterbody floor. As the beams are bounced back from the waterbody floor, the data is collected and processed. The processed data can be viewed in real time on the boat during the survey. Multi-beam surveying is generally done in larger water bodies.
  • Single-beam surveying: Rather than sending out a wide set of beams, single-beam bathymetry measures the water depth directly under the boat. Single-beam surveys are generally used for smaller water bodies.
  • Acoustic Doppler Current Profiler (ADCP): ADCPs are used throughout USGS to measure streamflow. ADCPs measure water velocity by transmitting sound waves which are reflected off sediment and other materials in the water. Data collected from ADCPs can then be used to for bathymetric mapping.
  • Sub-bottom profilers: Sub-bottom profilers are most commonly used to view the layers of sediment and rocks under the water body floor. A transducer sends a sound wave to the water body floor. This sound wave can penetrate the water body floor. The data returned from the sound waves can be mapped to show the layers beneath the water body floor.
  • Ecomapper Autonomous Underwater Vehicle: The Ecomapper can collect detailed bathymetric data, down to one-foot contours, in places that are difficult to reach with boats. The Ecomapper uses side-scan sonar and a Doppler velocity log.

We use bathymetric surveys for many different types of research:

  • flood inundation
  • contour of streams and reservoirs
  • leakage
  • scour and stabilization
  • water-quality studies
  • dam removal
  • biological and spill
  • storage and fill in reservoirs and ponds

Equipment list:

·        Bathymetry: Multibeams and single-beam high resolution echosounders (single frequency and dual frequency), sidescan sonar

·        Positioning: GPS RTK, DGPS, local stations, etc.

·        Current measurement: ADCP, current measurement, level sensors, etc.

·        Navigation: Modified crafts, Transport Canada certified (12 to 24 feet)

Bathymetry

·        Multibeams and single-beam high precision bathymetric surveys (marinas, port facilities, rivers, lakes and oceans)

·        Shoreline erosion monitoring

·        Dredging and underwater construction work monitoring and surveillance

·        Seabed imagery

·        Volume calculations

·        Mapping

Topography

·        Topographic surveys: implementation, levelling of existing structures

·        High accuracy GPS data collection and processing

·        Digital terrain model

·        Mapping

·        Quantity calculation

Current measurement and sediment dynamics

·        High accuracy current speed and direction measurement (stream, river and ocean);

·        Flow measurement;

·        Current measurement (ADCP, CTD, etc.);

·        Characterization of the ice cover;

·        Sediment budget;

·        Sediment coring and sampling.

Hydrology

·        Installation of rain-gauge, water level and meteorological stations

·        Snow density measurement

Oceanography

·        Installation of wind measurement stations and analysis

·        Physicochemical monitoring (temperature, salt content, turbidity)

·        Installation of tide gages and tidal analysis

·        Mooring installation for current and wave measurement

 

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