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FEATURE SPONSOR


MARINE SURVEYS


PROVIDING HIGH-RESOLUTION INTERACTIVE 3D VISUALISATION TOOLS


ADUS DeepOcean has established itself as the world leader in shipwreck survey and visualisation, working for international salvage companies and government agencies, on large-scale wreck removal and monitoring projects.


The company’s work has expanded to include the visualisation of a variety of other manmade structures subsea, which require detailed investigation and monitoring, such as oil & gas seabed infrastructure, and offshore renewables assets. They have recently completed a contract to survey all in field assets for SSE’s Greater Gabbard Offshore Wind Farm.


HIGH PROFILE SURVEYS


Previous high profile surveys have included that of the sunken Deepwater Horizon oil rig in the Gulf of Mexico, which lies at a depth of 5000ft, and was the cause of the largest oil spill in US history, and the Costa Concordia in Italy.


Of interest to those engaged in subsea operations is that unprecedented levels of detail can now be obtained on structures almost regardless of depth, utilising recent advances in high frequency multi beam sonar technology and also subsea laser, combined with improved positioning capabilities and the unique methodologies and visualisations developed by the company.


COSTA CONCORDIA


Precise assessment of the damage sustained on the starboard side of the Costa Concordia was possible as a result of the ADUS DeepOcean survey conducted immediately after the ship was pulled upright in September 2013, an event which was covered by the world’s media.


GROWING DEMAND


In response to growing demand for ultra high resolution (sub-centimetre) surveys for inspection maintenance and repair (IMR) protocols, the company has recently undertaken a series of trials in order to quantify the resolution achievable for dynamic surveys (i.e. from a moving vessel or ROV) using terrestrial and subsea lasers.


Lasers were used to image and measure a concrete target (in air and then subsequently underwater) with calibrated indentations and deformities of known dimensions designed to simulate ice scarring.


TRIAL RESULTS


The results of the trials showed that sub- centimeter resolution can be achieved dynamically using subsea laser systems (i.e. deployed from a moving survey vessel in this instance). Scarring and surface defects of less than 20mm could be identified. Information derived from standard hydrographic surveys or video footage is readily available to those engaged in asset management but often lacks detail or is not metrical in nature.


SIGNIFICANT VALUE


So, in ‘asset management’ terms the value of high resolution metrical data subsea is significant, allowing a precise and measurable ‘snapshot’ of the asset to be created at a point in time, with an ability to easily derive accurate measurements directly from the data.


This can then provide an effective means by which change over time can be assessed – a fundamental in terms of successful asset management, and essential for the purposes of informing subsequent intervention strategy in the renewables and oil & gas sectors in particular.


ONGOING R&D PROGRAMME ADUS DeepOcean have an ongoing R&D programme based at Dundee University and are continuing to exploit advances in visualisation technologies specifically for the benefit of oil & gas and renewables sectors.


Mark Lawrence MPhil Managing Director ADUS DeepOcean


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www.windenergynetwork.co.uk


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