Coastline Surveys Completes Geotechnical Investigation for Navitus Bay

SeaDiscovery.com
Monday, May 13, 2013
Photo: Coastline Surveys Ltd.

Coastline Surveys completed a geotechnical investigation of the seabed cable route at the proposed Navitus Bay offshore wind park, off the south coast of England.

Coastline Surveys, the Falmouth-based marine data consultancy, was chosen to extend previous phases of work as the main contractor. The team has provided geotechnical expertise to examine the viability of the proposed cable route that will transport energy from the wind park to shore.

Utilizing its 24-meter survey vessel, MV Flatholm, along with their C-COREHP vibrocorer, Coastline Surveys successfully completed sampling at 22 locations along the planned route for the cable. The route runs from the shoreline to approximately 12 miles off shore.

A key requirement for Navitus Bay was the acquisition of high quality samples for environmental and potential archaeological analysis.

On investigating the ocean floor, the team expected to find marine sands overlaying bedrock, with a range of depths throughout the area. It soon became clear that the site was made up of a variety of soil conditions ranging from soft silts to dense sand and clays.

Navitus Bay required undisturbed quality samples where possible, but particularly around the palaeochannels, where fine grained material and peat deposits were also expected.

Coastline Survey’s C-COREHP unit has a real-time Penetrometer fitted to it, to monitor the rate of penetration during sampling. This was especially invaluable in areas of softer loose sediments as it allowed the geotechnical team to recover high quality samples with reduced disturbance. 

The stiff clays and dense sands that the team encountered presented a different kind of challenge. The class leading power and weight of the C-COREHP unit meant the team was able to achieve good depths in these conditions, penetrating the ground up to one meter into the underlying stiff clay in some locations.  The penetrometer was particularly useful in these difficult conditions allowing the team to realize when they wouldn’t be able to recover any more sediment. As a result, the team was able to terminate their tests when appropriate, saving time and costs whilst preserving sample integrity.

Lab testing and reporting was completed at Coastline’s facility in Lowestoft. The Geotechnical logs, soil descriptions and core photography provided to Navitus Bay were of sufficient quality and standard to assist with identification of archaeological features.

www.navitusbaywindpark.co.uk

 

Maritime Reporter November 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Surveyors

Polarcus Awarded 3D Project Off West Africa

Polarcus Limited has signed a letter of intent with Perenco Oil & Gas Gabon S.A. for a 3D marine seismic acquisition project offshore West Africa.   The project,

Mermaid Wins Subsea Contract in Gulf of Thailand

Mermaid has secured a 2-year contract for its dive support vessel, ‘Mermaid Commander’, to provide subsea construction support in the Gulf of Thailand for a

Damen Delivers Survey Vessel to Fugro

Fugro Frontier is the third vessel in a series received by Fugro during 2014   Three months after its last delivery, Fugro has received the third of a series

Wind Power

Boskalis, VolkerWessels Win Offshore Wind Farm Work

Royal Boskalis Westminster N.V., in partnership with Volker Stevin International (VolkerWessels), has been awarded a contract by Iberdrola Renewables Offshore Deutschland

Nordic Yards Delivers 'Wind Server'

Nordic Yards officially handed over the offshore service vessel to the Danish company DBB Jack-Up Services A/S. During the handover ceremony, the ship was named ‘WIND SERVER’.

Dutch Container Terminal Signs on for Wind Power

APM Terminals Signs Contract for Wind-Power Generated Electricity for Maasvlakte II Terminal   APM Terminals has signed a two-year, €5 million ($6.23 million)

Ocean Observation

NOAA: US to See More Floods from Sea Level Rise

Most of U.S. coast may see 30 or more days a year of floods up to 2 feet above high tides. By 2050, a majority of U.S. coastal areas are likely to be threatened

DYT Yacht Transport Carries M/V OCEARCH

The 126-foot research vessel M/V OCEARCH is currently making its way from Port Everglades, Florida to Brisbane, Australia on board DYT Yacht Transport’s semisubmersible

Talisman Sinopec Closes North Sea Platform Ahead of Storm

Talisman Sinopec Energy UK has closed its Buchan Alpha platform in the North Sea, the company said on Wednesday, ahead of an expected severe winter storm. The

 
 
Maritime Careers / Shipboard Positions Maritime Security Maritime Standards Navigation Offshore Oil Pipelines Port Authority Salvage Ship Simulators Sonar
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1969 sec (5 req/sec)