[PhD defence] 20/11/2025 - Louisette Garcin: "De trajectoires en possibles: convergences spatiotemporelles de mobilités plurielles - Modéliser les trajectoires individuelles de mobilité quotidienne pour estimer le potentiel de regroupement spatiotemporel" (UMR ESPACE)

Ms Louisette GARCIN will publicly defend her thesis entitled: "De trajectoires en possibles: convergences spatiotemporelles de mobilités plurielles - Modéliser les trajectoires individuelles de mobilité quotidienne pour estimer le potentiel de regroupement spatiotemporel", directed by Mr Didier JOSSELIN and Ms Sonia CHARDONNEL, on Thursday 20 November 2025 at 2pm.

Laboratory

UMR 7300 ESPACE - Study of Structures, Adaptation Processes and Changes in Space

Composition of the jury

Mr Didier JOSSELIN	UMR ESPACE 7300 - CNRS - Avignon University	Thesis supervisor
Ms Catherine MORENCY	École Polytechnique de Montréal	Rapporteur
Ms Anne AGUILÉRA	UMR LVMT 9403 - CNRS - École nationale des ponts et chaussées and Université Gustave Eiffel	Rapporteur
Ms Sonia CHARDONNEL	UMR PACTE 5194 - CNRS - Grenoble Alpes University	Thesis co-director
Mr Arnaud BANOS	UMR IDÉES 6266 - CNRS - University of Le Havre Normandie	Examiner
Mr Samuel CARPENTIER-POSTEL	UMR ThéMA 6049 - CNRS - Marie and Louis Pasteur University	Examiner
Mr Philippe GERBER	Luxembourg Institute of Socio-Economic Research	Examiner
Mrs Ana-Maria OLTEANU-RAIMOND	UMR LASTIG 9403 - IGN - ENSG	Examiner
Mr Jean-Baptiste CHESNEAU		Guest
Mr Gabriel PLASSAT	ADEME	Guest

Summary

Everyday mobility today takes place at a wide variety of rhythms, practices and territorial contexts. This heterogeneity raises questions about the possibility of organising forms of spatiotemporal coordination between individual trajectories, at a time when mobility policies are seeking to reconcile sustainability, equity and efficiency. Understanding these margins of convergence requires a detailed analysis of individual trajectories, at the crossroads of social, spatial and temporal dimensions. The approach developed combines contributions from time geography and spatial analysis, in order to study the relationships between the rhythms of individuals' activities, their constraints and the territorial configurations in which they evolve. It is based on Mobility Surveys (EMD/EMC²) carried out in three French cities to model the main components of daily mobility: use of time, spaces frequented, distances travelled and modes of transport. The proposed method makes it possible to estimate individual trajectories and project them into a structured space-time, in order to analyse the latter's capacity to generate a potential for grouping. Based on these modelled trajectories, different levels of convergence are identified, revealing how social and territorial structures condition the possibilities for coordinating mobility. By combining probabilistic modelling and the study of spatial structures, this thesis proposes a generalisable framework for understanding the spatiotemporal coherence of everyday mobility. It shows that grouping is not just a matter of individual choice, but stems from collective rhythms and the organisation of space. In this sense, it sheds light on the structural conditions that encourage the coordination of journeys and opens up prospects for more sustainable mobility.

Keywords Daily mobility, individual trajectories, spatiotemporal grouping, modelling, spatial analysis, time geography