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FABLINK ALDERNEY

Client:

FABLINK Limited

Duration:

15 days

Budget:

N/A

Project Date:

2014

Background

Reconnaissance survey of an English Channel subsea cable route from Alderney island to Britain Jurassic coast including the clearance of multiple landing options.

Requirement

The survey included multi-beam, synthetic aperture sonar (seabed sonar imagery), sub-bottom profiler and ground truth along the 135km cable route and associated potential landfalls.

Challenges

  • Acquisition: ensure high data quality and full coverage along 135km route length characterized by water depth comprised between 10 and 180m.
  • Interpretation: process and interpretation of each dataset, prior to compilation for a better understanding and validation of local geomorphology interpretation of such English Channel transect.
  • Alignment charts and comprehensive charting to support the search for the corridor position of least impact.

Survey Solution

  • iXplorer 24/24 without refuelling
  • Synthetic aperture sonar Shadow, positioned by USBL, to ensure high resolution seabed imagery over a wide corridor
  • Sub-bottom profiler Echoes 3500 to obtain high resolution seismic data, with 20-30m observed penetration depth below the seafloor, for shallow geology description
  • Multibeam R2Sonic 2024 for morpho-bathymetry
  • Ground truth with grab sampler, positioned by USBL, to support the geophysical interpretation.
  • Compilation of geophysical dataset (sonar imagery, sub-bottom profiler) through the use of Delph Software Suite. Alignement charts and illustration under a GIS structure
  • Team of surveyors, geophysicists, cartographers and coastal engineers to ensure onboard, processing and reporting.

Outcome

Survey project along the English Channel transect highlighted interesting dataset successfully combined together for a regional morpho/sedimentology and subsurface geology understanding in order to identify the optimum routes for future cable installation.

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