This study deals with the planning and cost aspects of the dredging activities for the installation of the cable. The sandwaves along the proposed cable will have an impact on cable lay strategies and burial depth of the power cable. Dredging may be necessary to assure the equipment will not be halted by critical slope of the sea bed or that the cable will become exposed after some years due to moving sandwaves.

First the dredging volumes for various cable burial options are determined. For different cable burial options and Trailing Suction Hopper Dredger classes (maximum hopper content varying from 3,500 to 23,000 m³) the dredging productions have been calculated taking into account the variation in dredging depth along the routes. With these dredging productions the total costs and cost per cubic meter sand for each combination of burial option and dredger size has been determined.

Location
North Sea

Date
2004

Services
Physical subdocument EIA, Sandwave behaviour and morphological analysis, Plume disposal study (FINEL), Cable burial study, Dredging costs study