Beneficial Uses of Dredged Sediment

Description:

The Port of Rotterdam is situated in the Rhine-Meuse delta in the Netherlands. As the largest seaport in Europe, it requires constant maintenance dredging (approximately 10 million cubic meters annually) to keep navigation channels clear (Port of Rotterdam n.d.). Historically, much of this dredged sediment was transported out and dumped at sea. However, this approach stripped the estuary of vital sediment needed to maintain its natural ecological balance. Planners initiated this pilot to "reset" the natural system by keeping the sediment within the river system, utilizing it for flood protection, mitigating shoreline erosion, and stimulating the development of natural riverbank habitats rather than treating it as waste (Port of Rotterdam n.d.).

The Port of Rotterdam manages the area which exceeds 12,500 ha. This pilot targeted the estuarine shoreline within the harbor system. The estuarine environment is exceptionally valuable, serving as a critical transitional zone for migratory fish (like salmon and eels) and a vital foraging ground for coastal birds (Port of Rotterdam 2025). The restoration plan involved taking sediment dredged from the deep navigation channels and strategically relocating it to shallower (5-meter depth) near-shore zones within the harbor. The goal was to harness the natural ebb flow of the tide to distribute this sediment along the riverbanks, thereby naturally nourishing the shoreline, reinforcing flood protections, and creating ecological "stepping stones" (like mudflats and shallow wetlands) without impeding port navigation (Port of Rotterdam 2025).

The Port of Rotterdam Pilot was a core component of the broader EU INTERREG SURICATES (Sediment Uses as Resources in Circular and Territorial Economies) initiative. Operational dredging and relocation campaigns for the baseline pilot took place heavily between 2019 and early 2020, with subsequent monitoring and framework development continuing through 2024 (Port of Rotterdam n.d.). While the total cost of Rotterdam’s annual dredging operations is substantial, the SURICATES project received multi-million-euro EU grant funding to support the research, on-site monitoring, and execution of this specific beneficial use pilot (de Lucas Pardo 2025). The dredging method primarily relied on Trailing Suction Hopper Dredgers (TSHDs) (Port of Rotterdam n.d.). Instead of sailing to the North Sea, these vessels performed underwater relocation of the material close to the target wetland areas.

This project involved the reallocation of approximately 500,000 cubic meters of dredged sediment. To date, the project is considered a strong administrative and conceptual success, though it yielded complex physical results. It successfully proved that reallocating sediment internally reduces transit times, cuts CO2 emissions, and eliminates offshore waste (Port of Rotterdam n.d.). Advanced monitoring (including Distributed Temperature Sensing cables and rare earth element tracing) showed that while far-field estuarine sediment levels were not negatively impacted, the immediate near-field sedimentation at the target shallow sites was less than initially modeled due to complex harbor currents (Port of Rotterdam n.d,). However, the pilot successfully pioneered on-site rapid contaminant testing, demonstrating the viability of using circular-economy sediment for flood defense in highly trafficked commercial ports (Port of Rotterdam n.d.).

The Rhine-Meuse delta and the outer Port of Rotterdam (such as the Maasvlakte contours) support a rich array of wildlife. The estuarine waters are used heavily by seals and serve as the most important migration route for fish adapting to changing salinity levels (Port of Rotterdam 2025). The area is a critical stopover for coastal and migratory birds, including common terns, avocets, spoonbills, and various duck species (Port of Rotterdam 2025). The port environment also supports protected and pioneer species on its banks, such as the natterjack toad and the sand lizard, which benefit from the creation of stable, sediment-nourished shorelines (Port of Rotterdam 2025).

Published Articles & Related Projects:

• Munster Technological University. (n.d.). "SURICATES project (2017–2023)." Sustainable Infrastructure Research & Innovation Group. Accessed October 6, 2026.
• Ems-Dollart 2050. (n.d.). "Our approach." Accessed October 6, 2026.
• Lemière, B., Laperche, V., Wijdeveld, A., Wensveen, M., Lord, R., Hamilton, A., Haouche, L., Henry, M., Harrington, J., Batel, B., & Lehette, P. (2022). "On-site analyses as a decision support tool for dredging and sustainable sediment management." Land, 11(2), 274.

Website Links Discussing the Project Area:

• Port of Rotterdam Authority. "Re-using Sediment in Port of Rotterdam." Accessed October 6, 2026.

References:

• De Lucas Pardo, M. Beneficial Sediment Reuse in the Port of Rotterdam from a Logistical Point of View. Deltares Report No. 11208811-006-ZKS-0002, 2025.
• Port of Rotterdam Authority. Nature Vision 2025–2050. 2025. Port of Rotterdam
• Port of Rotterdam Authority. "The Slufter." Accessed October 6, 2026.