Hydrographic surveys are used to ascertain and map the depth and features of the seabed. Whilst geophysical surveys quantify the physical properties of the seabed and sub-seabed geology.
With a fleet of purpose-built vessels based at major port locations throughout the UK, we undertake both nearshore and offshore hydrographic and geophysical surveys for baseline, monitoring and inspection purposes.
We undertake hydrographic surveys using high resolution multibeam and singlebeam bathymetry sensors interfaced with inertial navigation systems.
When we need to know and understand seabed and sub-seabed composition and conditions, we utilise a full spread of geophysical survey equipment in a single survey, including multibeam echosounders, side-scan sonars, sub-bottom profilers and magnetometers.
Where traditional vessel-methods are not practical due to shallow water depths or restricted manoeuvrability, ABPmer offers bespoke survey solutions using USVs (unmanned surface vehicles).
As well as conducting hydrographic and geophysical surveys, ABPmer offers a full processing, reporting and charting service tailored to client requirements.
Seafloor mapping: Multibeam bathymetry provides high resolution full coverage seafloor mapping (water depth) data. By surveying a wide swath of seafloor beneath the vessel, large areas can be covered efficiently. As an alternative, single-beam bathymetry provides seafloor mapping data for a single profile beneath the vessel.
Seabed surface composition: Our multibeam systems are increasingly being used to source acoustic backscatter information; a powerful tool for characterising seabed surface composition. Side-scan sonar systems offer seafloor composition imagery which can help detect debris items and obstructions that may cause a hindrance to construction activities. Where objects protrude from the surface and cast shadows in the imagery, dimensions can be defined.
Sub-seabed characterisation: Our sub-bottom profilers provide information to identify and characterise layers of sediment or rock beneath the seabed. This is especially important for construction, cable and pipeline burial, and piling activities.
Buried objects: Magnetometers detect variations in the total magnetic field of the underlying seabed. An increased magnetic field can indicate the presence of ferrous iron on or beneath the seabed which may indicate shipwrecks or unexploded ordnance.