Hydrographic, geophysical and environmental data services

From specification to acquisition and data processing, HydroSurv™ takes pride in quality

Our Services

Working with specialists in the field, HydroSurv™ provides cost-reducing acquisition and

efficient downstream processing on a priced-activity basis

Bathymetric survey using Multi-Beam Echo Sounder (MBES) provides high-accuracy, high-density sounding data. This is useful for mapping seabed levels in ports, harbours and marinas; or shallow water environments where it is necessary to maintain safe navigation. MBES is often used to inform dredging strategies by comparing datasets between surveys so that changes in sediment deposition can be assessed. As a company, HydroSurv™ is developing techniques to use MBES sonar arrays from single and multiple stations to enable effective, rapid bathymetric data acquisition in challenging environments.
Bathymetric surveys using a Single Beam Echo Sounder (SBES) provide high-accuracy sounding data where a reduced density of data points satisfies requirements. Single Beam bathymetry is useful for mapping larger open-water areas where the high fidelity of the seabed is not necessary, or applications where dual frequency sensors allow penetration of softer sediments to obtain hard-bottom depths. SBES offers the customer a cost-effective solution for monitoring seabed levels where there is less obstruction or navigational hazards; and our small form sensors can be installed on very small platforms such as REAV-10 for simple, rapid mapping projects.
A Side Scan Sonar (SSS) enables underwater imagery of objects, features and obstructions to be mapped which may not be clearly identified with a profiling sonar. It is a useful tool for identifying or locating seabed objects or debris or monitoring underwater construction – for example placement of scour protection or mattresses. Side scan data can be processed into mosaics to visualise wide area data as a complementary survey dataset by environmental consultants, civil engineers or contractors. Tow-fish and vessel mounted transducers may be installed onto USVs depending on the specific application.
Geophysical surveys using a Sub-Bottom Profiler (SBP) can provide sediment layer thicknesses and characterisation of composition below bed level. HydroSurv™ can deploy an SBP as a part of a profiling spread to acquire samples in parallel with high-accuracy bathymetry measurement. Raw sediment profile data can be processed to provide the customer with a report in the form of sediment contour charts, which can be used to inform dredging plans by measuring sediment thickness overlaying bedrock or other hard strata.
Vessel mounted Acoustic Doppler Current Profilers (ADCPs) may be used to determine tidal flows over a wide survey area, where georeferenced and timestamped current velocity data may be collected in conjunction with bathymetric data, (at various points during a tidal cycle). ADCPs may be deployed on nearshore applications for tidal stream modelling for marine energy development, pre-construction worksite characterisation or oceanographic research; or deployed on rivers for hydraulic modelling, obtaining accurate data relating to channel gradient and depth, and to determine watercourse velocity, flow and discharge measurement.
Vessel mounted LIght Detection And Ranging (LIDAR) surveys provide high-density point clouds of structures above water adjacent to the USV. The LIDAR point cloud data can be processed to enable high-definition 3D visualisation of structures. The best example of where HydroSurv™ is developing this inspection technique is where it is to be used as a part of an integrated sensor suite encompassing MBES and photogrammetry for seamless and non-invasive seabed to splash-zone structural inspection; but there are other applications such as port and harbour quay wall surveys, inspection of structures within civil engineering and inspection of foundation structures in the offshore sector.
Photogrammetry surveys use still photographic data acquired from video frame stills or photographs to develop photographic 3D models. The process can be used above water, or underwater in shallow-water sites with good visibility and light. Underwater photogrammetry shows promise as a complementary dataset to hydro-acoustic survey improving the characterisation of an environment – including applications within marine ecology such as habitat / spawning ground surveys or benthic macrophytes.
Case Studies
MANX UTILITIES AUTHORITY | Reservoir Hydrographic Surveys

MANX UTILITIES AUTHORITY | Reservoir Hydrographic Surveys

Manx Utilities contracted HydroSurv to carry out bathymetric and sediment profiling surveys for all operational reservoirs on the Isle of Man
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Autonomous Inspection of Seabed and Splash Zone Structures for Offshore Wind Arrays
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