The Application of Distributed Acoustic Sensing for Shallow Marine Investigations an Intertidal Case Study

Trafford, A.; Donohue, Shane; Ellwood, Robert; Godfrey, Alastair; Wacquier, Loris

doi:10.3997/2214-4609.202120142

NSG2021 27th European Meeting of Environmental and Engineering Geophysics 2021

DOI: 10.3997/2214-4609.202120142

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The Application of Distributed Acoustic Sensing for Shallow Marine Investigations an Intertidal Case Study

A. Trafford

Shane Donohue

Robert Ellwood³

et al.

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2022

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Distributed acoustic sensing for active offshore shear wave profiling

Trafford

Ellwood²,

Wacquier

et al. 2022

Sci Rep

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The long-term sustainability of the offshore wind industry requires the development of appropriate investigative methods to enable less conservative and more cost-effective geotechnical engineering design. Here we describe the novel use of distributed acoustic sensing (DAS) as part of an integrated approach for the geophysical and geotechnical assessment of the shallow subsurface for offshore construction. DAS was used to acquire active Scholte-wave seismic data at several locations in the vicinity of a planned windfarm development near Dundalk Bay, Irish Sea. Complimentary additional datasets include high-resolution sparker seismic reflection, cone penetration test (CPT) data and gravity coring. In terms of fibre optic cable selection, a CST armoured cable provided a reasonable compromise between performance and reliability in the offshore environment. Also, when used as a seismic source, a gravity corer enabled the fundamental mode Scholte-wave to be better resolved than an airgun, and may be more suitable in environmentally sensitive areas. Overall, the DAS approach was found to be effective at rapidly determining shear wave velocity profiles in areas of differing geological context, with metre scale spatial sampling, over multi-kilometre scale distances. The application of this approach has the potential to considerably reduce design uncertainty and ultimately reduce levelised costs of offshore wind power generation.

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Distributed acoustic sensing for active offshore shear wave profiling

Trafford

Ellwood²,

Wacquier

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

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The Application of Distributed Acoustic Sensing for Shallow Marine Investigations an Intertidal Case Study

Cited by 1 publication

References 4 publications

Distributed acoustic sensing for active offshore shear wave profiling

Distributed acoustic sensing for active offshore shear wave profiling

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