Aspect Land & Hydrographic Surveys

Aspect Land & Hydrographic Surveys have the equipment and expertise to undertake a wide range of marine support services, including pre & post dredge surveys, turbidity monitoring, barge & rig positioning and associated works whether in open waters or congested harbours, waterways or approach channels.

Dredging Surveys & Supervision

We have significant experience in dredging supervision works, including pre and post dredge surveys and payment volume calculations. We regularly conduct interim surveys for numerous dredging contractors throughout the UK - although we act as an independent survey company, which is a major benefit to the client or port authority.

We also act as the client's representative on contractor's surveys to witness and verify survey results, as required in many contracts.

Projects include both Capital Dredging works (quay construction, etc) utilising Backhoe or Bucket dredgers and Maintenance Dredging (removal of silt / sediment over a previously established level) usually carried out by Grab Hopper dredgers and workboats operating Plough Levelling techniques.

Our equipment is wholly adaptable and whilst we have our own custom-built survey vessels, we can also use local site workboats where of benefit to the client. Survey output is available in a variety of industry-accepted outputs including AutoCAD, XYZ, GENIO and hard copy plots up to A0 size.

All interim data sets can be uploaded into the dredger's Dig Control Systems (DCS) for improved on-site operational efficiency.

Our experience ranges from surveys of small harbours and berths to whole harbours and approach channels which are well within our capability.

Marine Positioning Systems

Global Positioning Systems (GPS) have changed the way the world operates and this is especially true for marine operations; including construction and dredging projects. GPS provides the fastest and most accurate method to navigate and determine the location of a workboat or dredger, thus enabling increased levels of safety and efficiency.

Aspect Land and Hydrographic Surveys offer RTK GPS positioning systems to the marine construction and engineering industry, including installation, on-site training, hardware and full back-up services.

Accurate positioning is important for many elements of marine engineering, whether in open waters or congested harbours, waterways or approach channels.

Our positioning system provides the contractor with the position and heading of the workboat or dredger relative to the actual work area, with the data displayed on a monitor in the operator's cabin.

Positioning is displayed with an accuracy of sub-metre or a few millimeters, depending on the preferred positioning system (RTK or DGPS). The use of these systems allows the contractor to be continually informed and gives a clear overview of the works progress.

Applications include dredging works in harbours, ports & navigation channels, real-time commercial marine positioning for oilrig cold stack projects, wharf & sheet piling operations, coastal erosion control works, diver support services, pipeline & outfall deployment projects, marine engineering contracts and environmental surveys.

Environmental Monitoring

Maintaining adequate water depths for navigational purposes is an important operation although the rate of sedimentation has accelerated as a consequence of many environmental changes, in particular dredging and marine construstion works, coastal erosion and changing tidal patterns.

We offer a range of monitoring and data capture services for hydraulic modelling and sedimentation issues within the marine environment.

Our capabilities include current & turbidity monitoring, grab sampling, tidal prediction, water column analysis and dye / drogue tracking and in addition offer advice and guidance on environmental impact assessments.