URBAN PLANNING ADAPTATION TO SITE ECOLOGICAL CONDITIONS
Site analysis shows the overwhelming presence of green areas on the campus. The projet’s aim is to find the necessary conditions to preserve the presence of nature into urban areas: which is the site’s future. That priority outweights the site’s challenges because it attempts to suppress the fundamental contradiction between a densification willingness and the preservation of nature into the city as wished by the city dwellers. Our urban principle consists in sparing, for all new infrastructures and constructions, the necessary conditions to the setting of an urban and ecological tension area, the Urbatone.
This principle declined at city level and on the ecology will allow the structuring of urban landscape and will give it an adaptation ability to city dwellers’ practices and bio diversity. Thus, for every change of environment, development will be adjusted as to amplify ecological and urban dynamic,
URBAN PLANNING ADAPTATION TO TERRITORY EVOLUTION
Even though the Orsay University campus is part of the cluster project led by the National Interest Operation Paris-Saclay, the strategic challenges are centered over the Saclay plateau. The university, historical place for scientific research, has to adapt to that new situation. Through our proposition, the campus will become a « rotula » creating an articulation between the new plateau area and the towns of Bures-sur-yvette and Orsay, distinct environment meant to be complementary. By proposing a different and innovative offer with new equipments that will fulfill the university’s new needs we are offering attractive activities for the residents of Bures-sur-Yvette, Orsay, as well as for the residents of the new densified campus. The new plan does not claim to compete with the existing urban fabric of the old city centers, nor does it claim to compete with the new plateau de Saclay projet. Our projet aims at bringing a complement fulfilling its role within the scientific cluster or Paris-Saclay.
URBAN PLANNING ADAPTATION TO SITE INFRASTRUCTURES
When the site is strongly linked to ecological grids, it still misses relations with the urban structure upon which it depends. It is yet very well inclined to welcome major infrastructures.The challenges developed by the Saclay scientific cluster project imply the creation of a link between the RER B and the plateau which preserves the site. The extremely strong constrain of the difference in height orientated the project towards the setting of a cable railway between the Bures-sur-Yvette station and Saclay via the campus center. Transport services need to be reinforced due to the dimension of the site. Besides the location of the station at the heart of the campus embodies political will to bring the different competence centers closer together. On the other hand, access to the plateau will be reinforced by two supplementary railway connections via the hillsides. One of them will highlight the entrance of the site to the north and connect to the Pierre de Coubertin axis to the south new entrance (work in progress). The north axis is thus highlighted. It is treated just like all the other new transport network, and thus supports ecological functions. The adding of the new direct connection to the RER in the town of Orsay and the requalification of existing informal entrances opens the door to the Orsay campus. The river Yvette is a place of east-west geographical connection, and also a north-south boundary. The blue infrastructure will be used as a strong link to the valley. The Yvette walk starting at Villebon-sur-Yvette makes the connection, on campus site, between the Chateau de la Grande maison’s park (in Bures-sur-Yvette) and the setting of the park du Launay and the Guyonnerie wood. Its surroundings are usable as such, but the walk has very few connections with the campus. The building of that ecotone including footbridges, rest area and observation spots will guaranty the opening of the walk upon the river and its surroundings. Finally, the adding of the city farm and the Forum will enhance its attraction.
Those infrastructure settings, over the landscape or the ecology, such as the cable railway in Bures, the access to Orsay, the ecotones and the city farm, the walk on the river Yvette will enable to address the Paris-Saclay site from the valley and will open the campus.