Ecological restoration of ecosystems

The Royal Gardens, situated between Piazza San Marco and the Bacino di San Marco, came into being during the Napoleonic occupation of the city and used to be a space for recreational activities for locals for many years after the monarchy was over. During past decades, the gardens have progressively deteriorated. Their original design is now barely legible, in terms both of geometrical patterns and the placement of trees and shrubs. They were rapidly becoming a derelict area. This intervention consists of their recovery by restoring the original vegetation by recovering still-living plants and introducing new ones. Between 2015 and 2019 the Gardens underwent complex restoration, carried out by the Foundation and planned by the gardener and landscape architect Paolo Pejrone, student of Russell Page and Roberto Burle-Marx, while architectural renovation and the rebuilding of the greenhouse was planned by architect Alberto Torsello, based on a project drawn up by Carlo Aymonino and Gabriella Barbini. Reopened in December 2019, the Royal Gardens, rich in unexpected perspectives and luxuriant growth, have reacquired their formal excellence and botanical complexity, in coherence with their historic nineteenth-century design. (1, 2 and 7).

The landscaping of the Vuosaari landfill site has appeared to be an excellent example of ”Integrated Planning Approach” as following concepts were applied: restorative design; ecological design; regenerative development and conventional design (ref. 1). The unused Vuosaari landfill hill had been transformed into a natural area where now domestic plants grow in meadows and rocky conditions. The area is now also used for recreational, educational and scientific purposes (ref 1, 2). The purpose of the project was to promote social, economic and environmental activities at the Vuosaari landfill site (ref. 1).

The Reconstruction of the Southern Bank of Schütt Island is the starting point of the regeneration of the Old City of Nurnberg. Within the project, the access to water and recreational functions of the river banks were improved. (1) The project was completed on an 1800 square meter large area, which includes open meadow areas, a 170-meter-long bank terrace, trees, and benches. (6) Public participation through co-planning and consultation was also involved in the planning process. (1)

The company running the Zabalgarbi waste disposal site manages a solid waste–to-energy plant and also houses a mechanical biological treatment (MBT) plant, a composting plant, a landfill and a leachate treatment plant. During construction of the first plant, Zabalgarbi regenerated and recovered the entire Artigas-Arraiz area covering 108 hectares. The area was degraded by shaft mining activity and an opencast quarry. The project aimed at the reforestation and landslide mitigation of this degraded area. Today the area has been reforested, trails were built and space provided for people to enjoy themselves in gardens, picnic areas and along forest tracks. (Ref 1)

The Urban Forest project represents an increase of urban trees in the city. There will be two phases of this project. In the first, it consists of a transformation of an eye-sore and abandoned space, around previous Canodrome, into a large urban forest (Ref 1, 9). The second one will be located in the land of the velodrome of Es Tirador. This projec has been delaid due to unforeseen costs (Ref 10).

Forest of Bere has been identified as one of the key project areas of the Partnership for Urban South Hampshire (PUSH) Green Infrastructure Strategy. The goal is to allow urban populations of south Hampshire to have better access to quality green space. (1) Part of the forest, called Portsdown Hill, is a Site of Special Scientific Interest (SSSI) is on the boundary of urban Portsmouth and supports extensive areas of calcareous grassland where a wide diversity of typical chalk grassland plants and insects can be found. The last twenty years have seen extensive areas of scrub being removed and restored to open grassland. The project aims to restore the once flourishing natural habitat of the forest while providing more recreational opportunities to the growing number of residents in the surrounding areas, was well as improving the ecological connectivity of separate woodlands (1,2,4,5).

Wetlands provide a varying degree of treatment of discharged water and are ideally suited for the containment and treatment of polluted water runoff, being a holistic example of Sustainable Drainage Systems (SuDS). The Dublin Local Authority installed an Integrated Constructed Wetland to treat polluted water discharged from the urban area, with the aim of cleaning urban runoff and drainage water. It was meant to purify water that discharges into a pond, and later on into the Tolka river. The project has been very successful in treating polluted water effectively, according to studies. (Ref. 1; Ref. 3)

From 1850 to 1956 the area Eskesberg was a limestone mine, after that up until 1972 it served as a landfill. When taken over by the city of Wuppertal, groundwater contamination and outgassing required a large remediation to remove toxic substances and recover the area according to nature conservation guidelines. (Ref. 8) Since 2005, it has been turned into a nature conservation area covering 8.5 ha where several rare plants and animals have resettled and thus the area also serves as an important recreational space for residents (Ref. 1, 2, and 3). The project was initiated by the local government, who also collaborate with different partners for maintaining the nature conservation area, such as the biological station, which organizes excursions, performs monitoring on the terrain and sets up bee hives. Also, residents apart from visiting the area can actively participate in its maintenance as volunteers, guided by the city of Wuppertal and the NGO Biologische Station Mittlere Wupper. Furthermore, the nature conservation association of Wuppertal and scientists from the university of Cologne are involved in the intervention by conducting research on the terrain (Ref. 1, 2, 3 and 6).

The Foz do Douro Urban Park located in the west of Porto city is a green area for public use inserted into a recently developed urban area, which has been progressively been built along the Atlantic seafront since the nineteenth century and the Park is part of an overall project submitted in the competition Nuno Álvares Avenue Plan promoted by the Porto Municipality. With approximately 5ha, Foz do Douro Urban Park clearly contributes to increasing the rates of existing green areas for public use, increasing the availability of open spaces for the local and regional level. (1)

In 2011, the Great Lines Heritage Park was formed by connecting the Great Lines, Lower Lines, Inner Lines, Forst Amherst and Medway Park together. To do so, a former military area was transformed. The intervention connects the heritage towns of Chatham and Gillingham and the Chatham Waterfront. By connecting the heritage of the town and the waterfront, the project aimed to emphasize both these aspects of the area, but also to improve visitors' access and be a habitat for a number of species (Ref 2). The area has been created from a site that is of international heritage significance. The park is located within the Thames Gateway priority housing area, Europe’s largest regeneration project (ref. 3).