Coastal protection / hazard mitigation

This intervention is part of a broader masterplan regarding harbours and seacoast in Palermo, with a specific focus on the Cala coastal area. The waterfront has importance for the city not just as a harbour, but for its relational, cultural and recreational functions as well. In particular, the Molo Trapezoidale can become the new “water district” in which compatible port functions will be integrated with the existing urban functions and the new residential areas, as well as the new cultural and recreational services with new infrastructures linked with natural features such as green areas and trees. (Ref.1.)

Following a severe storm in 2000 that overwhelmed the sewage system of Portsmouth along with its main Wastewater Pump Station, causing major flooding in the city with the destruction of private and public properties, prevention of such events become a key priority (5).
The Portsmouth Flood Alleviation Scheme aims to relieve the pressure on the sewage system in wet weathers by diverting the accumulated surface water flows away from the combined sewer networks and discharge them into the harbours around the island (5). The Scheme consists of several measures across the city, among others the creation of a new open watercourse channel across the Great Salterns Golf Course diverting surface water directly into Great Salterns Lake (5). This measure of the scheme is a solution that separates surface water to provide resilience, boost flood protection and benefit the environment with the minimum of new infrastructure (1).

North Wirral Coastal Rangers and volunteers are working together to plant discarded Christmas trees to stabilise sand dunes between Leasowe Bay and the Gunsite area of the North Wirral Coastal Park. The Christmas trees help to catch and trap sand blowing in from the beach and in a few years will create artificial dune shapes, benefiting plants and animals. (Ref. 1)

In 2016 the Rangers and volunteers undertook a dune restoration project at the Gunsite. They advertised for the public to drop off their old Christmas trees at a collection point. The trees were then used to reinforce the dunes and trap sand. This was very successful and in 2017 they continued with the project, again with great success. In 2018 they ran a high profile social media campaign using Twitter and Facebook, asking for more Christmas Trees. This has generated a huge response and generated over 900 trees. It also prompted Radio Merseyside to interview Dave Stevenson, the Coastal Ranger, over the project and how it was helping to stabilize and re-establish the dunes (Ref 8).

The Sand Motor is a hook-shaped peninsula that is artificially created at the coast near The Hague in order to protect the coast on the long-term. Not only provides the Sand Motor coastal protection, but it also allows for new forms of recreation and supports biodiversity as it creates habitat and allows for more varieties of species to live in the area. The Sand Motor is a unique pilot project in coastal management and follows the principle of 'building with nature' (1).

Port Sunlight River Park has been transformed from a closed landfill site to a 28-hectare park providing a popular community space with an array of walkways, wildlife, wildflowers, woodlands and a wetlands area. Port Sunlight River Park is a 30 hectare green space, park and wetland reclaimed from a former landfill site with a 37m high hill offering unrivalled views across the Mersey, Wirral and North Wales. (Ref 9). Autism Together were later brought in to help realise the Land Trust’s vision to provide a community site that makes a positive difference for local people and visitors, promoting healthy lifestyles in the process. (Ref. 1, 2).

The project was implemented in the eastern coast of Poland in the Pomeranian Voivodship. A 5.98 km of the current sea coast within the administration of the Maritime Office in Gdynia was secured and fortified until 2015. The purpose of the initiative is to increase the number of marine shore sites restored to a former state by recultivating degraded areas, securing landslides, and securing marine shores from erosion [1].

In 2017, under a bigger project, the municipality of Sintra started the work for the rehabilitation of an area that included beaches and rivers, such as the Mata river. The NBS solves a problem of accumulation of water and sludge that was unsolved, through the recovery and cleaning of Ribeira da Mata (small river/brook), planting trees and promotion of an improvement in water quality and sand on the beach.
(1)

Within the territory of the Region of Attica there are more than 100 wetlands including streams and their estuaries, coastal marshes and lagoons, lakes and constructed wetlands. They constitute “biodiversity islands” within a broadly degraded environment and offer the inhabitants of the Attica Region the opportunity to stay in touch with nature. A strategy and an action plan were developed for the conservation and restoration of these ecosystems in fighting climate change within the EU-funded OrientGate transnational co-operation project. (Ref. 1)
Climate Change is expected to put additional pressure on these habitats as, based on future climate projections, Attica’s vulnerability to drought is expected to rise from low to moderate by the year 2100. Drought episodes are expected to last longer and occur more frequently than in the past. This phenomenon is expected to have a serious impact on Attica wetlands as most of them are rain-fed. (Ref. 1)

In 2014, the Marseille Provence Métropole Urban Community commissioned five new stormwater retention basins in order to preserve the quality of coastal waters and reduce the risk of flooding (Ref. 4). In the past, in the event of severe thunderstorms the sewage networks became saturated and a portion of the water was then directly discharged into the sea without going through the sewage treatment plants (Ref. 1). This is seen as "one of the most important documents of recent years in terms of environmental protection. It foresees in the next 5 years, 185 million euros of major works" (Ref. 1).

The city of Palermo has planned a series of interventions to regenerate the coastal area in the Southern part of the city (Bandita, Romagnolo and Acqua dei Corsari). The activities performed to reach this goal were the cleaning of the green areas which surround the coast and creation of playground zones for kids. In particular, the green areas were expanded with the plantation of typical plants of the Mediterranean area. This project was aiming to improve the condition of both water and the coast itself, to make it more attractive and accessible to everyone. (Ref.1.)