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Submarine link Sardinia-Corsica-Italy

Marine Survey, Desktop Study & Environmental
Characterisation for Cable Route Design and Engineering.

Scope of work

Marine survey for cable route design and engineering

Next Geosolutions has been appointed to perform a marine survey for cable route design and engineering for the Project “Marine Survey, Desktop Study & Environmental Characterisation for the Submarine Link SA.CO.I. (Sardinia-Corsica-Italy)” in the Tyrrhenian sea.

The SA.CO.I. consists of multiple 220 kV AC connection between Italy and Sardinia.

  • Tyrrhenian
    Sea
    Area
  • 0-460 m
    wd
    Water Depth
  • 2x100 km
    2x13.8 km
    Cable Route Length
  • 220 kV
    AC
    Power
SACO Route connecting Sardinia and Corsica
COI Route connecting Corsica and Italy

Services

What we did to get to the end result

Once the scope is defined, studying what operations will have to be involved is the next step. For this project, expertise and resources came from Next Marine and Next Remote joining forces.

Desktop study

DS consist of collation, evaluation and integration of project‑relevant information already available for preliminary assessment of site conditions and conceptual design.

Inshore and offshore marine survey

The inshore and offshore survey include:

  • Cable routes corridor bathymetric and geophysical survey, by MBES, SBES, SSS, SBP and magnetometer operated from surface.
  • High resolution sub-seabed geophysical survey for buried boulders detection.
  • Environmental survey by ROV and sampling campaign for “Relazione tecnico-ambientale descrittiva per la posa dei cavi marini”.
  • Data processing for all field survey tasks to be carried out on-site/on-board.
  • In-field and final report including charts.

Onshore/nearshore topographic survey

From the shoreline to the sea/land joint bays area.

Visual inspection

Performed on existing power cables by ROV.

Quick fact

The SA.CO.I. submarine link was an update and development of the existing submarine cables, dating back to 1967.

Methodologies

How we achieved the end result

We combine methodologies and innovation to reach the most efficient way to accomplish the best possible result.

Desktop study

Performing a DTS at an early stage in pipeline routing assessment can ease planning and decision‑making processes by:

  • Identifying a suitable corridor(s) (typically with a width of tens of kilometres, depending on the data available)
  • Guiding the remainder of the data acquisition programmes, enabling the selection of the most appropriate survey technologies and analysis techniques
  • Highlighting any issues that may exist along the route that may require individual or discrete study to be performed.

Visual inspection on existing power cables

The Visual inspection shall be carried by an ROV along the unburied cable sections. Where the cables are buried shall be use a cable tracker mounted on the ROV itself.

Underwater positioning

The underwater positioning shall be ensured by means of a USBL system, interfaced with the data logger and navigation computer.

Bathymetry

Our performance is as important to us as it is to our Clients. We understand they rely on us and we want them to stay with us for all the years to come.

Side scan sonar

To characterize the geomorphological setting of the seabed and to detect/verify the presence of any obstacles and/or seabed features, the High Resolution Dual Frequency Digital Side Scan Sonar shall be operated for the marine survey.

Sub-bottom profiling

A suitable sub-bottom profiling system shall be used in order to help and integrate the interpretation of sonar data and give a continuous and clear definition of the bottom nature and sub-bottom stratigraphy.

Magnetometer

To detect any magnetic anomaly and ferromagnetic target, a suitable towed marine gradiometer shall be used during the survey.

Onshore/nearshore topography

A detailed topographic survey shall be performed at landfall both onshore and nearshore, by means of RTK DGPS technology.

Our commitment

Quality, Health, Safety, Environment

We adopt QHSE Management Systems which embody all aspects of Quality Assurance, Competence Monitoring and Risk Assessment, as well as comprehensively addressing Health, Safety & Environmental issues.

Next is committed to always deliver products and services of a consistently high quality, aiming to meet and possibly exceed the Client’s requirements and expectations. The health and safety of employees and other persons involved are safeguarded, and proper regard is paid to the conservation of the environment.

NEXT QHSE Management Systems are fully in-house managed.

Resources

The assets involved in the project

The resources and technologies which have concurred to the achievement of the marine survey for cable route design and engineering we have been appointed for.

Equipment

Description Type/Model
Topographic Equipment for Alongside Calibrations DGPS-RTK Leica SR530
ROV–Light Work Class + Cable Detection system Tomahawk + TSS 350
Primary Surface Positioning DGPS Fugro STAR FIX 4100
Secondary Surface Positioning DGPS Fugro STAR FIX 4100
Data Acquisition & Navigation Software QPS QINSy software package
Heading & Attitude (Back-up) Ixsea Octans
Underwater Acoustic Positioning System USBL Sonardyne Ranger II
Multi-beam Echosounder Reson SeaBat 8125 + Reson SeaBat 8160
Side Scan Sonar Klein 3000 + Edgetech 4200
Sub-Bottom Profiling 1 Geoacoustics Chirp II
Marine Magnetometer Marine Magnetic Seaspy
Sound Velocity Profiler Valeport Midas SVP

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