Edge of a Third Forest
- by Andrej Bernik
- 2021-03-25 16:46:24
- 6306 / FR
Lisière d'une Tierce Forêt is an innovative solution against heat waves that combines the forest ecosystem and accessibility of public space. This refreshing infrastructure resembles an urban forest and was developed by a multidisciplinary team of architects, foresters, climatologists and engineers. After 5 years of design, the 1,200 m² prototype was inaugurated in 2020 in Aubervilliers (93) in a home for young workers managed by the Alteralia association.
La Tierce Forêt is positioned at the forefront of sustainable urban cooling . The founding principle of infrastructure is the restoration of the city's water cycle. The four pillars of consistency of the final design are soil regeneration on site, local rainwater infiltration, carbon storage and increased biodiversity.
The infrastructure has several strengths:
- restoration of the water cycle and biodiversity in cities;
- the resilience and passivity of the cooling ecosystem;
- increased carbon storage through good plant health;
- reduction of runoff for the watershed.
3rd part certified
Website Enterprise / Infrastructurehttps://www.tierceforet.com
Testimony / Feedback
- During the days studied, we note a drop in temperature (UTCI index) of -2.5 ° C on average over 24 hours, going down to -6 ° C around 1 p.m.
- The air temperature was also recorded at the site, down to -1.0 ° C in the late afternoon. The increase in relative humidity remains limited, but temporarily exceeds + 2%.
- The observed changes are significant for all parameters for at least 35% of the day. The study shows that tree shade has a significant impact on lowering UTCI in the morning , as well as in the early and late afternoon.
article published on January 22, 2021 by Agence Parisienne du Climat
What do the first scientific results say?
The first results published by the LIED of the University of Paris, and Météo-France demonstrate the effectiveness of the operation on the thermal comfort of users (Parison S. et al, 2020). They relate to the analysis of the measurements carried out in the summer of 2018 (before work) and in the summer of 2019 (after partial work: the installation of the new coating was not completed).
The absence of cars, a clear and permeable coating and of course the presence of a new plant canopy have led to fairly significant impacts on the microclimate of the site.
The use of measurements from the summer of 2020 and then 2021, once the work is completed, will make it possible to obtain more complete results.
Fieldwork / Alteralia project leaders
Consortium of companies
Mondel TP, Pépinières Chatelain, SOLS-IDF
Alteralia is an association for social integration through housing created 45 years ago. Historically, its action has focused on the management of the residence for young workers Eugène-Hénaff in Aubervilliers. As part of its mission of general and social interest, Alteralia wished to offer a more pleasant living environment for the young people accommodated in the residence.
Fieldwork is a collective of architects, town planners and engineers who work in the social and solidarity economy, mainly on social and environmental projects. They provide engineering, architectural and urban design services focused on social justice, reducing inequalities and adapting to climate change for all. The team was surrounded by specialists Ekolog / EcoSustain, LIED, IPH-VRD.
Supported by the Urban Lab of the city of Paris, the project has brought together many public and private partners. The interest in the process demonstrates its educational potential and its reproducibility. The project was carried out in two stages: a study and evaluation phase with ADEME and the APC, and a works phase with the IDF Region, Seine Normandy Water Agency, the Seine Saint- Denis, the city of Aubervilliers, the RATP Foundation, CAF, Lafarge-Holcim and the SOLS company.
The price per square meter of the development is equivalent to the price of a classic green development in the city, it is around 250 € / m². The infrastructure also has the advantage of low maintenance cost.
The Third Forest is a passive ecosystem solution that remains economically competitive and easily reproducible .
- Air quality
- Water management
- Soil management
- Climate adaptation
Edge of a Third Forest
Inspired by the principles of permaculture, La Tierce Forêt responds to cooling objectives by offering a resilient and reproducible system that exceeds the benefits of a vegetated place.
Our innovation is our systemic solution for urban cooling. The association of plants and minerals, the treatment of soil and atmosphere interfaces, the use of old and new technical solutions have made it possible to create a network of positive and resilient interactions that support the city's water cycle. This new kind of ecosystem is autonomous and passive . It works with sun, water and gravity.
The technical responses of our eco-device are a draining and resistant material for the floor covering, a method of collecting and storing rainwater, a phase shift of plant transpiration for lasting cooling, a permeable concrete which allows restoration. biological and chemical soil.
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