Hydrographic Survey Services

Through combining the latest multibeam echosounders with high-performance inertial navigation systems and integrated navigation and processing software, we provide accurate, real-time visualisation of seabed bathymetry, objects and human-made structures.

SEP Hydrographic provides Hydrographic Survey Services to clients throughout the UK and Northern Europe.

Our experienced surveyors and highly qualified professionals are committed to delivering accurate data that is tailored to your requirements.

Through combining the latest multibeam echosounders with high-performance inertial navigation systems and integrated navigation and processing software, we provide accurate, real-time visualisation of seabed bathymetry, objects and human-made structures.

Hydrographic surveys can be performed in various locations, from coastal shallow areas to rivers and lakes. Multibeam echo sounders and associated technology can be mounted on vessels, Automated Surface Vessels (ASVs) and even Autonomous Underwater Vehicles (AUVs).

We have extensive experience in hydrographic surveying and seabed mapping, providing services to the offshore construction and renewable energy industries, environmental consultants and local authorities. Our survey vessels are equipped with multibeam echo sounders, positioning systems, sub-bottom profilers and side-scan sonar to undertake high-resolution data acquisition for a variety of applications.

Hydrographic Survey Applications

Hydrographic surveys are used for a range of applications, including:

Offshore Wind Developments

Hydrographic surveys are used for the planning and installation of offshore wind farms. The survey data provides insights into the seabed bathymetry, potential hazards and the suitability of installation sites.

Cable Route Surveying

Cable route surveys are used to determine the best location to lay communication and power cables between two points. The data gathered from the survey is used to design a route that avoids hazards, reduces risk and minimises costs.

Oil & Gas

Hydrographic surveys provide key information on underwater features relevant to oil & gas assets, such as pipeline integrity and scour monitoring.

Inshore Marine Construction Projects

Hydrographic surveys are used for the planning and installation of offshore structures such as ports, jetties and breakwaters. The survey data informs construction teams on the nature of seabed conditions and allows them to accurately plan the installation.

Maritime Archaeology

Hydrographic surveys are used to locate shipwrecks, submerged remains, and ancient structures. The data gathered by our surveyors can then be used to create 3D models of the features.

Port and Harbour Developments

Hydrographic surveys provide essential data for managing ports, harbours and marinas. The surveys are used to assess sedimentation levels, navigability, dredging requirements and infrastructure development.

Hydrographic surveys
bathymetry data example
bathymetric survey
MBES data

Hydrographic Survey FAQs

How does a multibeam echosounder work?

A multi beam echosounder works by emitting short pulses of sound energy and measuring the time it takes for the echo to return. This survey data is then used to create a digital terrain model (DTM) of the underwater landscape and identify hazards, objects and human-made structures.

What are inertial navigation systems?

Inertial navigation systems use accelerometers and gyroscopes to measure acceleration, rotation and other changes in movement relative to a predetermined reference point. This data is then used for precise positioning and orientation of surveying equipment.

What kind of information can be gathered from a hydrographic survey?

Hydrographic surveys provide detailed visualisations of the seabed bathymetry, objects and human-made structures. The data gathered can also be used to assess sedimentation levels, navigability, dredging requirements and infrastructure development.

What are the benefits of using a hydrographic survey?

The main benefit of hydrographic surveying is that it provides detailed information about an underwater area and bed levels which would otherwise not be visible or accessible. Survey data can be used to accurately plan offshore construction projects and inform the installation of cables, pipelines, wind farms and marine infrastructure.

This makes it ideal for planning construction projects in offshore environments as well as assessing potential hazards and evaluating cable routes between two points. It is also useful for maritime archaeology and identifying archaeological sites beneath the water's surface.

What are the risks associated with a hydrographic survey?

Hydrographic surveys involve working in areas with strong currents, changing weather and other potential hazards. As such, it is important that surveyors have adequate safety training and use certified equipment to reduce the risks.

Additionally, surveyors must be aware of the potential environmental impacts associated with their work and take steps to minimise them.

How long does a hydrographic survey take?

The duration of a hydrographic survey depends on the size and complexity of the area being surveyed. Small areas can generally be completed in one to two days, while more extensive surveys may take weeks or even months.

It is important to plan ahead and allow sufficient time for both data collection and post-processing.

How much does a hydrographic survey cost?

The cost of a hydrographic survey varies depending on the size and complexity of the area being surveyed, as well as the equipment used. Generally speaking, smaller surveys tend to be more affordable than larger projects due to the reduced amount of data collected.

What is the maximum water depth that can be surveyed?

The maximum water depth that can be surveyed depends on the capabilities of the equipment being used, and whether the data is acquired from the surface or from a subsea platform. As the water depth increases, the data resolution may decrease, and lowering the sensor closer to the seabed will improve the resolution.

Are hydrographic surveys weather dependent?

Yes, as weather conditions can affect the ability of the survey team to collect data. Strong winds and high waves can not only affect data quality but can also endanger the safety of the team. As such, surveyors must take into account weather patterns and plan accordingly in order to ensure optimal results.

Get in touch

With our commitment to quality service and dedication to delivering accurate results, SEP Hydrographic are confident that we will meet your exacting requirements. Whether you are looking to survey an offshore wind farm, assess cable routes or investigate maritime archaeology, our experienced surveyors and professionals have a deep understanding of hydrographic surveying and its applications.

Hydrography is an essential part of any maritime operation, providing important insights into the environment and allowing for informed decision-making. Contact us today to learn how SEP Hydrographic can help you achieve successful results.