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.聽聽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.聽

Multiple methods can be used for bathymetric surveys:聽

  • Multi-beam surveying: A multibeam echo sounder attached to a boat sends out聽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聽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聽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:

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

路聽聽聽聽聽聽聽聽Positioning: GPS RTK, DGPS, local stations, etc.

路聽聽聽聽聽聽聽聽Current measurement: ADCP, current measurement, level sensors, etc.

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

Bathymetry

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

路聽聽聽聽聽聽聽聽Shoreline erosion monitoring

路聽聽聽聽聽聽聽聽Dredging and underwater construction work monitoring and surveillance

路聽聽聽聽聽聽聽聽Seabed imagery

路聽聽聽聽聽聽聽聽Volume calculations

路聽聽聽聽聽聽聽聽Mapping

Topography

路聽聽聽聽聽聽聽聽Topographic surveys: implementation, levelling of existing structures

路聽聽聽聽聽聽聽聽High accuracy GPS data collection and processing

路聽聽聽聽聽聽聽聽Digital terrain model

路聽聽聽聽聽聽聽聽Mapping

路聽聽聽聽聽聽聽聽Quantity calculation

Current measurement and sediment dynamics

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

路聽聽聽聽聽聽聽聽Flow measurement;

路聽聽聽聽聽聽聽聽Current measurement (ADCP, CTD, etc.);

路聽聽聽聽聽聽聽聽Characterization of the ice cover;

路聽聽聽聽聽聽聽聽Sediment budget;

路聽聽聽聽聽聽聽聽Sediment coring and sampling.

Hydrology

路聽聽聽聽聽聽聽聽Installation of rain-gauge, water level and meteorological stations

路聽聽聽聽聽聽聽聽Snow density measurement

Oceanography

路聽聽聽聽聽聽聽聽Installation of wind measurement stations and analysis

路聽聽聽聽聽聽聽聽Physicochemical monitoring (temperature, salt content, turbidity)

路聽聽聽聽聽聽聽聽Installation of tide gages and tidal analysis

路聽聽聽聽聽聽聽聽Mooring installation for current and wave measurement