As regular maintenance and relocation of sediment deposits are highly expensive, Port authorities seek more efficient solutions for reducing the costs and CO2 emissions of maintenance dredging. One solution, water injection dredging (WID), is carried out for maintaining the sediment deposits which predominantly consist of clay and silt. WID has been proven to be a cheaper solution by leaving the sediment in place, eliminating substantial costs for relocation of the dredged sediment.
Maintenance dredging is required in many estuaries worldwide to provide access to ports and inland waterways. A newly developed dredging module is able to capture the two fundamental processes necessary to model the long-term impacts of dredging on turbidity.
By preparing material from maintenance dredging with selected additives, a protective dyke was constructed from 100% reused sediments.
With dredging responsibility for 11 municipalities along the environmentally sensitive Tagus estuary, the Port Authority of Lisbon needed an integrated strategic dredging plan. After detailed studies, they got it.
To take well-founded financial decisions, help manage risks and reduce uncertainty, a model for calculating the probabilistic assessment of maintenance dredging volumes was developed using the Olokola LNG project near Lagos, Nigeria, as an example.