Port of Huelva, Habitat Recovery in the Odiel Estuary
The Port of Huelva sits on the Odiel estuary in southwest Spain. Port areas on the left bank of the Odiel had degraded marshes and bare mudflats. Between 2006 and 2007 the Port Authority of Huelva carried out an ecological restoration project along a four kilometre stretch of this bank (Port of Huelva, n.d.). PIANC's project record describes a wider project to recover habitats and seabirds through beneficial use of dredged material and bio-tools, which started in 2008 and was completed in 2018 in phases (PIANC, 2023). In 2024 PIANC gave its Working with Nature Award First Prize to the Huelva Port Authority project on recovery of habitats through beneficial use of dredged materials and bio-tools (PIANC, 2024). Working with Nature is PIANC's approach of considering natural systems from the start of navigation infrastructure projects (PIANC, n.d.).
Approach
Restore degraded port marsh. The port restored a four kilometre stretch of the left bank of the Odiel estuary within port land (Port of Huelva, n.d.).
Use bio-tools. The project used bio-tools to recover the ecological functions of the ecosystem (Port of Huelva, n.d.).
Replace invasive with native vegetation. Work included eradication of the invasive cordgrass Spartina densiflora and establishment of native Spartina maritima meadows on former bare mudflats (Port of Huelva, n.d.).
Manage dredged material sustainably. The port treats sustainable management of dredged material as a line of action, using the best technical options in line with applicable rules (Port of Huelva, n.d.). PIANC's 2024 award cites beneficial use of dredged materials in the habitat recovery project (PIANC, 2024).
Open the site to the public. A pedestrian path was built so residents and visitors can use the restored area (Port of Huelva, n.d.).
Results
The port reports more than 130,000 m2 of Spartina maritima meadows on former bare mudflats, capturing more than 300 t of carbon a year. It reports a mature and diverse marsh ecosystem, new habitat for protected birds, and more than 65 protected bird species observable in the port (Port of Huelva, n.d.). PIANC's project record reports 57 bird species censused in the restored port marshes (PIANC, 2023). The restoration project was a finalist in the 2014 ESPO Awards (Port of Huelva, n.d.), and the dredged material and bio-tools habitat project won the PIANC Working with Nature Award First Prize in 2024 (PIANC, 2024).
Transferability
DMC ports with degraded intertidal land inside port limits can restore it as habitat rather than leave it idle. Restoration can be linked to maintenance dredging by using suitable dredged material to build habitat. Removing invasive plants and planting native salt marsh species is low technology. Public access paths add social value. Reporting results such as habitat area, carbon uptake and bird counts helps secure support and recognition.
Sources
All information used for this case study was based on publicly available resources.
- PIANC. 2024. Working with Nature Award (2024 winners). PIANC. (opens in new tab)
- PIANC. n.d. Working with Nature. PIANC. (opens in new tab)
- Port of Huelva (Autoridad Portuaria de Huelva). n.d. Sostenibilidad y medio ambiente. Puerto de Huelva. (opens in new tab)
- PIANC. 2023. Recovery of Habitats and Seabirds through the Beneficial Use of Dredging and Bio-tools in the Port of Huelva (Working with Nature project questionnaire, 23 January 2023). (opens in new tab)