Dredging of an approximately 2,000 metre long cable route across the Fehmarn Sound is carried out by Høj Nordic Marine Contractor, using the vessels Camilla Høj, Lea Høj, Elisabeth Høj and Alberte Høj.
Dredging at varying depths
The works include route and excavation depths ranging from -3 to -17 metres and the handling of approximately 51,000 m³ of moraine clay and sand. The material is partly placed in depot areas and partly disposed of at designated disposal sites. In addition, clearance of seaweed, sediments and stones is carried out, and a sand layer is established at the bottom of the cable route.
Technically demanding cable works
The selected cable type entails enhanced quality requirements. The cable route is kept free of stones larger than 10 cm, and the cables are further protected with sand layers and ballasted geotextile both below and above. Assistance is also provided by our crew during cable installation.
Coordination across stakeholders
Close coordination is required between the many parties involved. This places high need for planning, collaboration and flexibility to ensure progress throughout all phases – from dredging to final reinstatement with re-deposition of materials.
The works contribute to the establishment of a robust and secure cable route supporting the regional energy infrastructure. A complex offshore project.
The Fehmarn Netz project is executed for a German client
