Dredging optimisation in focus
Since dredging often represents a significant portion of the operational and capital expenditure costs associated with maritime infrastructure, dredging optimisation is something that owners, operators and developers increasingly need to focus on, says Mark Lee.
In simple terms, dredging optimisation offers multiple benefits. It can identify, quantify and implement efficiency savings and reduce environmental impact. A win-win for the broader stakeholder groups.
Where to optimise?
Because of dredging’s significant cost and highly technical nature, it can be difficult for owners and operators to see efficiency gains clearly, but optimisation opportunities can be identified at any stage of a project.
During the design stage costs and the environmental footprint can be reduced by examining the navigational and operational requirements to minimise dredging volumes.
During tendering and construction assessing the capability of the dredging plant and the way it is applied helps in maximising efficiency, whilst preparation of bespoke dredging contract packages results in reduced costs, compliance with regulatory conditions and high quality bids.
When optimising operations, selecting the best time of year for maintenance dredging with respect to infill, plant availability (cost), and operational need is important.
A vital part of the project
We have supported port operators and contractors where dredging optimisation was vital to project success. The dredged areas’ extents and depths were optimised using navigation simulations and sedimentation modelling; tidal depth availability was assessed, and historic sedimentation patterns analysed. Furthermore, on-site supervision has been provided on some of the world’s largest dredging projects, where schedules and specifications were met.
This approach can significantly reduce the dredged volume and improve dredging efficiency. HR Wallingford has realised savings of around €3.5 million to individual projects for individual maintenance dredges, while maintaining a safely navigable port, and these savings are repeatable for future maintenance dredges.
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