Anaël Mayeur: Plants were long considered to be a mere technical resource to serve humans, then as an aesthetic element that boosted the acceptability of planning projects. Now, they could be a way to integrate constructions into their environment more fully, provided that we consider their characteristics in greater detail. This is the subject of my doctoral research project, which focuses on the composition and study of the herbaceous seed combinations that promote biodiversity while continuing to meet the conventional technical challenges of revegetation.

The aim is to obtain seed mixes with a greater diversity of species than those commonly sold and used in large-scale developments, with a view to attracting small animals and pollinators in particular, but also to establishing competition against invasive exotic species. Some mixes are made up of seeds from the Végétal Local brand, the idea being to have sufficient genetic diversity for these species to enjoy enhanced resilience in the face of climate change, and a reduction in the use of inputs for their healthy growth.

Nicolas Durvaux: During the construction phases for new sections, we rolled out large-scale revegetation plans for the surrounding areas, with more than 17 million trees planted, as well as major sowing operations. We are currently working on maintaining this and incorporating new challenges such as abolishing the use of agrochemicals and applying reasoned mowing. We hope to promote and increase the potential for renaturation of the available green areas.

In addition, we have also observed that our need for mineralised operational surfaces has dropped by around 30% (around the operations centre, coating platforms, etc.) alongside technical and organisational developments. The opportunity arose to propose a renaturation of these spaces by demineralising unnecessary surfaces.

Renaturation raises questions regarding the creation of functional natural environments. Which levers do you use to achieve this?

Nicolas Durvaux: As the projects are smaller in size than those during the construction phases, each site needs to be engineered individually. Following the soil analysis phase, our partnership with the French Office National des Forêts enables us to conduct a study of several technical renaturation approaches for each plot. These approaches combine conservation measures of the existing sites such as meadows and hedgerows, the planting of local tree species that can adapt to climate change, and the creation of wetlands. For each project, these different approaches optimise the creation of natural areas and are approved by our in-house experts with a view to assessing the impact of feasibility, ecological interest and repercussions on maintenance.

Anaël Mayeur: To follow on from what Nicolas was saying, the composition and selection of seed mixes to be sown are part of the engineering work to be rolled out on every type of site. As part of my project, mixes with different functions are tested. Some are designed to be competitive against invasive exotic species, with others are intended to cover the plots quickly after being sown or to attract pollinators.

Let’s remember that the creation and upkeep of a site’s functions also depend on environmental factors that are not always under our control. It is therefore a good idea to preserve pre-existing natural elements where possible.

When a sowing operation is required, the use of wild and local seed mixes means that we can rely on species’ natural resilience to adapt to the changes in their environment. In this way, we give the better adapted plants a greater chance of survival in the event of disruptions. This leads to a sustainable population of plant species. We are in a long-term approach aimed at maintaining the newly created plant communities, and therefore their functions.

Both of your projects incorporate short supply chain development objectives in different ways. Which opportunities and obstacles have you come across?

Anaël Mayeur: Having a stock of wild and local seeds requires a sector with a wide range of skills and stakeholders. The technical pathway from collection to planting is complex and calls for local stakeholders with sound knowledge of the local area. We predict opportunities for the creation or specialisation of companies within this market, in addition to partnership opportunities for developers and stakeholders in this budding sector. Such partnerships would improve project acceptability and would also give rise to high-quality products and advice, in tune with the local conditions which planning projects must face.

Although the study of the social and economic factors is still in its infancy, two major obstacles to the widespread adoption of this approach are becoming apparent. The first concerns the cost of seed purchases, which may be prohibitive in comparison to mass-produced seeds. However, the removal of inputs and the reduction in seed quantities may offset these excess costs, for equivalent results (this remains to be demonstrated). The second obstacle concerns the supply of wild and local seeds. As the sector is still in its early development, not all regions are covered when you need to find a producer able to fulfil large orders, for example in the event of motorway construction and the creation of related compensatory areas.

Nicolas Durvaux: Short supply chains are primarily used in the deconstruction of mineralised sites. For the first project, we contacted local associations who were looking for materials. For the second project, we want to work with Granulat+® to optimise material recycling. Their presence across France means that chains can be shortened and recycling reduces the footprint of resources.

Our second ambition for short supply chains is to work on renaturation projects with local companies and building sites that bring the unemployed into the workforce. In addition to the pride of managing these projects in their local areas and seeing them grow, there is also the ambition of training new stakeholders in these approaches.

Lastly, the third challenge concerns the need to support local seedling creation sectors by conducting these projects with local plant species. This means planning future developments with a vision spanning several years.

Which stakeholders must be brought in to roll out your approach as widely as possible?

Nicolas Durvaux: The primary stakeholders are naturally project managers. We have to prove to them the benefits for biodiversity and convince them to agree to long-term projects.

These projects are rooted in local areas. Sometimes, local elected representatives wish to get involved by sharing the ambition or drive to support local employment, for the project’s completion or the arboriculture sector.

As some projects may need to extend their scope to include potentially workable land for certain types of agriculture, we must also foster dialogue upstream with chambers of agriculture and local farmers, to work with them to design projects that can meet the twofold environmental and sustainable production objective.

Anaël Mayeur: To second what Nicolas has said, it is necessary that project managers are involved as early as possible in the design phases so that plant requirements are planned ahead, to discuss the challenges they represent and to define the share of the budget that will be allocated to this. This can facilitate access to material by leaving stakeholders in the production sector the time to obtain a sufficient quantity to meet demand.

More generally, it is important to raise awareness among all stakeholders who use seed mixes, whether as part of the management of the sites operated, the construction of new developments or environmental restoration sites, so that the functions and importance given to plants on these sites can be reconsidered. Taking an interest in the origin of plants and the composition of commonly used seed mixes could play a part in improving the integration of projects in the current environmental challenges that local areas face.

For further information, you can watch the replay of the the Research & Solutions webinar on “The revegetation of road infrastructure” with Anaël Mayeur and Nicolas Durvaux (in French).

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Peri-urban farms with short food supply chains are currently enjoying strong growth and represent the leading type of urban agriculture for the supply of fresh produce in towns and cities. This type of farm includes horticultural areas and many new small-scale projects based on alternative systems such as bio-intensive market gardening and permaculture (CC by 2.0 - Sustainable sanitation).Urban community gardens and urban mini-farms are two other forms of urban agriculture that are currently being developed. Community gardens combine social, educational and food-related goals and are projects that attract a participation from the greatest number of urban dwellers (Les Vignoles gymnasium, Fanny Provent).Urban micro-farms can be multi-purpose or focus primarily on production (Hotel Pullman Eiffel Tower, Paris).Less common in French towns, greenhouses, indoor agriculture and low-tech and high-tech systems entail greater investment costs (Agripolis farm, Paola Mugnier).These production systems are not very attractive for urban dwellers and, as regards greenhouses, raise issues related to the landscape (an integrated greenhouse on one of the buildings of the former Anderlecht abattoirs, Paola Mugnier).

Paola Mugnier and Fanny Provent also describe multifaceted and multi-purpose production systems. Their practical guide « Urban agriculture: how to implement it on rooftops and terraces? » (from which photos #2 to #5 are taken), as well as the Exp’au urban agriculture consulting company and agriculturalization indicators, feature among the approaches rolled out, based on researcher knowledge, to assist and equip developers when selecting project content, in addition to project implementation and management. Another important aspect for developers is the issue of urban contaminations. The REFUGE methodology has been designed to conduct an assessment of health risks based on a historical survey of the site and ground investigations. This type of assessment reveals a lack of risk or identifies when a site is in a grey area, as is often the case, which may be used by rolling out a health control plan or through farming methods that do not use the ground soil.

The prospects for the development of urban agriculture are set to be extensive and varied. Many flat roofs represent untapped high-potential land resources. A number of new requirements are emerging in relation to the analysis of soil bearing capacity, an improved integration of greenhouses in buildings, optimised management of flows and uses and lastly the incorporation of urban agriculture in circular economy scenarios.

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The presentation of the project will show how the project partners define the concept of a zero-energy building, including aspects of comfort and environmental performance. The approach developed to reduce costs will then be described. And finally the results, in particular those concerning the case studies, will be discussed. The project also includes training and knowledge dissemination activities.

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Digital model of the project (Pleiades).Dynamic thermal simulation results (Pleiades Comfie), temperatures during heatwaves.Life-cycle assessment results (Pleiades Equer), contributions to global warming.

The research work carried out at the École des Ponts ParisTech aims to anticipate mobility practices and services in the Les Lumières Pleyel neighbourhood as well as their impact on the environment. A statistical approach based on analysis of the socio-economic profiles of the individuals who will live and work in the neighbourhood aims to achieve an initial rapid estimate of uses and activities. This approach is then fine-tuned by multi-agent modelling that is aimed at a much more precise estimation of mobility needs and the effects of the implementation of new mobility services. The environmental impacts of associated mobility practices are then assessed through the prism of life-cycle assessment. It is therefore possible to assess the relevance of development choices and to propose solutions that are tailored to local characteristics, in order to improve the environmental performance of a neighbourhood.

the MATSim multi-agent model used by the LVMT laboratory of École des Ponts ParisTech to simulate the mobility of the Île-de-France population.

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STEM is a technical and economic model, intended to:

• quantify the different issues;
• simulate states of equilibrium between transport supply and mobility demand;
• seek out optimised states of the system by calculating action variables which optimise an objective function while satisfying imposed constraints.

The typical application is to seek a plan for the public transport prices and offer that maximises a function of collective well-being (sum of the surplus demand, operator profits and the monetisation of environmental impacts), while respecting a subsidy limit for the operation of public transport.

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The DTS Comfie module also calculates the energy consumption of the equipment (Dynamic Energy Simulation or DES) at each time step with the possibility of recovering heat losses, evaluates several comfort indicators and has a utility to manipulate and generate weather data files.

Comfie is linked to Amapola, which makes it possible to identify the least expensive solutions, anticipate uses and optimise the reliability of forecasts. It is therefore possible to assess energy consumption within the framework of the energy efficiency guarantee with a risk of an overrun of less than 5%. Thanks to data from smart sensors, the software program takes occupants and their behaviour into account.

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