Laboratoire d'Urbanisme

Urban areas, in particular cities, are significant consumers of materials and energy, either directly on their land areas or indirectly through the materials, goods and services they import or export; there are upstream and downstream consequences of the removal of resources and the discharge of waste materials (to the atmosphere, water and soils), with multiple impacts on the biosphere. The processes involved need to be better characterised to reduce these environmental pressures. This is a sustainable development issue and it is a major goal of a field ecology which has been described as urban, industrial or sometimes territorial. This paper reviews the specific origins and findings of studies on urban metabolism. It describes the analysis tools used, including material and substance flows, energy balances, ecological, water and, more generally, environmental footprints. Finally, recent findings and areas for future research in the dematerialisation of urban societies are summarised.

The failure of top‐down imposed institutional reform for metropolitan areas in the western world has called for new conceptions of institution‐building. A bottom up, governance type approach is now considered in various countries which focuses on flexible, voluntary and partnership elements of collective action through which institution is no longer considered as a ready‐made object but as a process. A large part of the literature insists upon the effectiveness of this approach through the search for consensus and highlights its internal elements as conditions of success. However, this conception forgets the political and ideological dimensions of institution‐building and, consequently, the likely conflicts and obstacles unresolved by governance. This article discusses the relationships between metropolitan government and governance taking a few western urban areas as examples and questions the apparent success of the ongoing metropolitan experiences.

Hegger, D. L. T., P. P. J. Driessen, M. Wiering, H. F. M. W. Van Rijswick, Z. W. Kundzewicz, P. Matczak, A. Crabbé, G. T. Raadgever, M. H. N. Bakker, S. J. Priest, C. Larrue, and K. Ek. 2016. Toward more flood resilience: Is a diversification of flood risk management strategies the way forward? Ecology and Society 21(4):52. https://doi.org/10.5751/ES-08854-210452

Short-term rentals facilitated by online platforms (like Airbnb) have recently become a subject of intense debate, leading many city governments to pass new regulations attempting to control both their proliferation and platform activities. While these policy responses vary greatly from city to city, there is little comparative research to explain this diversity. This paper employs a sociological approach to public policy analysis to compare the politicization process, collective action around and regulation of platform-mediated short-term rentals (PM-STR) in three cities – Barcelona, Paris and Milan. They were chosen to represent most-dissimilar cases in terms of regulatory outputs, both in terms of stringency (weak in Milan, intermediate in Paris, strong in Barcelona) and choice of policy sectors (sharing economy and tourism in Milan, housing and land use in Paris, urban planning and tourism in Barcelona). Two main findings emerged from the comparison. First, the differences between regulations can be explained by the type of actors who politicized the issue in the first place and framed it within a specific policy sector, the pre-existing policy instruments traditionally used in that sector and the distribution of competences between the city and higher tiers of government. Second, the regulations remain continuously subject to intense political mobilization by six types of actors with clashing interests: professional STR operators, associations of hosts or ‘home-sharers’, the hotel industry, residents’ associations or citizens’ movements, ‘sharing economy’ advocates and corporate platforms. Each actor constructs different narratives regarding PM-STR, claiming different types of rights in this contentious politics of regulation.

Increasing levels of auto ownership and use are causing severe social, economic, and environmental problems in virtually all countries in Europe and North America. This book documents the worsening tr

ABSTRACT Background Since December 2019, the coronavirus disease (COVID-19) has massively spread, with overwhelming of health care systems and numerous deaths worldwide. To remedy this, several countries, including France, have taken strict lockdown measures, requiring the closure of all but essential places. This unprecedented disruption of daily routines has a strong potential for disrupting nutritional behaviours. Nutrition being one of the main modifiable risk factors for chronic disease risk, this may have further consequences for public health. Our objective was therefore to describe nutritional behaviours during the lockdown period and to put them in light of individual characteristics. Methods 37,252 French adults from the web-based NutriNet-Santé cohort filled lockdown-specific questionnaires in April-May 2020 (nutritional behaviours, body weight, physical activity, 24h-dietary records). Nutritional behaviours were compared before and during lockdown using Student paired t-tests and associated to individual characteristics using multivariable logistic or linear regression models. Clusters of nutritional behaviours were derived from multiple correspondence analysis and ascending hierarchical classification. Results During the lockdown, trends for unfavourable nutritional behaviours were observed: weight gain (for 35%; +1.8kg on average), decreased physical activity (53%), increased sedentary time (63%), increased snacking, decreased consumption of fresh food products (especially fruit and fish), increased consumption of sweets, biscuits and cakes. Yet, opposite trends were also observed: weight loss (for 23%, −2kg on average), increased home-made cooking (40%), increased physical activity (19%). These behavioural trends related to sociodemographic and economic position, professional situation during the lockdown (teleworking or not), initial weight status, having children at home, anxiety and depressive symptoms, as well as diet quality before the lockdown. Modifications of nutritional practices mainly related to routine change, food supply, emotional reasons but also to voluntary changes to adjust to the current situation. Conclusion These results suggest that the lockdown led, in a substantial part of the population, to unhealthy nutritional behaviours that, if maintained in the long term, may increase the nutrition-related burden of disease and also impact immunity. Yet, the lockdown situation also created an opportunity for some people to improve their nutritional behaviours, with high stakes to understand the leverages to put these on a long-term footing.

PURPOSE: Previous research on the influence of the food environment on weight status has often used impersonal measures of the food environment defined for residential neighborhoods, which ignore whether people actually use the food outlets near their residence. To assess whether supermarkets are relevant contexts for interventions, the present study explored between-residential neighborhood and between-supermarket variations in body mass index (BMI) and waist circumference (WC), and investigated associations between brands and characteristics of supermarkets and BMI or WC, after adjustment for individual and residential neighborhood characteristics. METHODS: Participants in the RECORD Cohort Study (Paris Region, France, 2007-2008) were surveyed on the supermarket (brand and exact location) where they conducted their food shopping. Overall, 7 131 participants shopped in 1 097 different supermarkets. Cross-classified multilevel linear models were estimated for BMI and WC. RESULTS: Just 11.4% of participants shopped for food primarily within their residential neighborhood. After accounting for participants' residential neighborhood, people shopping in the same supermarket had a more comparable BMI and WC than participants shopping in different supermarkets. After adjustment for individual and residential neighborhood characteristics, participants shopping in specific supermarket brands, in hard discount supermarkets (especially if they had a low education), and in supermarkets whose catchment area comprised low educated residents had a higher BMI/WC. CONCLUSION: A public health strategy to reduce excess weight may be to intervene on specific supermarkets to change food purchasing behavior, as supermarkets are where dietary preferences are materialized into definite purchased foods.

This paper investigates the theoretical backgrounds of the “cluster” and proposes a framework aiming at drawing the contour of cluster theory. The profundity of the notion of ‘clusters’ is arguably conditional on the coherence of three fundamental issues associated with the concept: 1) the economic and social benefits that may accrue to firms when clustering or co-locating (the existence argument); 2) the diseconomies encountered when clustering exceeds certain geographical and sectoral thresholds (the extension argument); and, finally, 3) the possible erosion of economies and onset of diseconomies over the lifecycle of the cluster (the exhaustion argument). Each of these three issues is examined in terms of three relevant major theoretical frameworks that can be brought to bear on the cluster concept. The paper considers approaches based on the idea of externalities (illustrated by the Marshall's work on ‘Industrial district’); on competitiveness issue (illustrated by Michael Porter’s theory of cluster growth); on a territorial perspective (illustrated by the GREMI approach). The paper acknowledges the general shift in explanatory emphasis from considerations of static cost efficiency towards more dynamic interpretations that highlight the creation and use of knowledge as their pivotal theoretical element. By placing these changes within a common conceptual framework the paper shows how different theoretical solutions provide distinct points of departure for subsequent policy recommendations. Three distinctive groups of solutions are identified focusing respectively on local spillovers, on competitiveness and on the region and its development. The paper concludes by identifying areas of particular ambiguity where further theoretical work is most urgently needed.

BACKGROUND: According to the social ecological model of health-related behaviors, it is now well accepted that environmental factors influence habitual physical activity. Most previous studies on physical activity determinants have assumed spatial homogeneity across the study area, i.e. that the association between the environment and physical activity is the same whatever the location. The main novelty of our study was to explore geographical variation in the relationships between active commuting (walking and cycling to/from work) and residential environmental characteristics. METHODS: 4,164 adults from the ongoing Nutrinet-Santé web-cohort, residing in and around Paris, France, were studied using a geographically weighted Poisson regression (GWPR) model. Objective environmental variables, including both the built and the socio-economic characteristics around the place of residence of individuals, were assessed by GIS-based measures. Perceived environmental factors (index including safety, aesthetics, and pollution) were reported by questionnaires. RESULTS: Our results show that the influence of the overall neighborhood environment appeared to be more pronounced in the suburban southern part of the study area (Val-de-Marne) compared to Paris inner city, whereas more complex patterns were found elsewhere. Active commuting was positively associated with the built environment only in the southern and northeastern parts of the study area, whereas positive associations with the socio-economic environment were found only in some specific locations in the southern and northern parts of the study area. Similar local variations were observed for the perceived environmental variables. CONCLUSIONS: These results suggest that: (i) when applied to active commuting, the social ecological conceptual framework should be locally nuanced, and (ii) local rather than global targeting of public health policies might be more efficient in promoting active commuting.

BACKGROUND: Preliminary evidence suggests that recreational walking has different environmental determinants than utilitarian walking. However, previous studies are limited in their assessment of environmental exposures and recreational walking and in the applied modeling strategies. Accounting for individual sociodemographic profiles and weather over the walking assessment period, the study examined whether numerous street network-based neighborhood characteristics related to the sociodemographic, physical, service, social-interactional, and symbolic environments were associated with overall recreational walking and recreational walking in one's residential neighborhood and could explain their spatial distribution. METHODS: Based on the RECORD Cohort Study (Paris region, France, n=7105, 2007-2008 data), multilevel-spatial regression analyses were conducted to investigate environmental factors associated with recreational walking (evaluated by questionnaire at baseline). A risk score approach was applied to quantify the overall disparities in recreational walking that were predicted by the environmental determinants. RESULTS: Sixty-nine percent of the participants reported recreational walking over the past 7 days. Their mean reported recreational walking time was 3h 31mn. After individual-level adjustment, a higher neighborhood education, a higher density of destinations, green and open spaces of quality, and the absence of exposure to air traffic were associated with higher odds of recreational walking and/or a higher recreational walking time in one's residential neighborhood. As the overall disparities that were predicted by these environmental factors, the odds of reporting recreational walking and the odds of a higher recreational walking time in one's neighborhood were, respectively, 1.59 [95% confidence interval (CI): 1.56, 1.62] times and 1.81 (95% CI: 1.73, 1.87) times higher in the most vs. the least supportive environments (based on the quartiles). CONCLUSIONS: Providing green/open spaces of quality, building communities with services accessible from the residence, and addressing environmental nuisances such as those related to air traffic may foster recreational walking in one's environment.

BACKGROUND: Socio-ecological models suggest that both individual and neighborhood characteristics contribute to facilitating health-enhancing behaviors such as physical activity. Few European studies have explored relationships between local built environmental characteristics, recreational walking and cycling and weight status in adults. The aim of this study was to identify built environmental patterns in a French urban context and to assess associations with recreational walking and cycling behaviors as performed by middle-aged adult residents. METHODS: We used a two-step procedure based on cluster analysis to identify built environmental patterns in the region surrounding Paris, France, using measures derived from Geographic Information Systems databases on green spaces, proximity facilities (destinations) and cycle paths. Individual data were obtained from participants in the SU.VI.MAX cohort; 1,309 participants residing in the Ile-de-France in 2007 were included in this analysis. Associations between built environment patterns, leisure walking/cycling data (h/week) and measured weight status were assessed using multinomial logistic regression with adjustment for individual and neighborhood characteristics. RESULTS: Based on accessibility to green spaces, proximity facilities and availability of cycle paths, seven built environmental patterns were identified. The geographic distribution of built environmental patterns in the Ile-de-France showed that a pattern characterized by poor spatial accessibility to green spaces and proximity facilities and an absence of cycle paths was found only in neighborhoods in the outer suburbs, whereas patterns characterized by better spatial accessibility to green spaces, proximity facilities and cycle paths were more evenly distributed across the region. Compared to the reference pattern (poor accessibility to green areas and facilities, absence of cycle paths), subjects residing in neighborhoods characterized by high accessibility to green areas and local facilities and by a high density of cycle paths were more likely to walk/cycle, after adjustment for individual and neighborhood sociodemographic characteristics (OR = 2.5 95%CI 1.4-4.6). Body mass index did not differ across patterns. CONCLUSIONS: Built environmental patterns were associated with walking and cycling among French adults. These analyses may be useful in determining urban and public health policies aimed at promoting a healthy lifestyle.

Abstract. The anthropogenic heat flux can be an important part of the urban surface energy balance. Some of it is due to energy consumption inside buildings, which depends on building use and human behaviour, both of which are very heterogeneous in most urban areas. Urban canopy parametrisations (UCP), such as the Town Energy Balance (TEB), parametrise the effect of the buildings on the urban surface energy balance. They contain a simple building energy model. However, the variety of building use and human behaviour at grid point scale has not yet been represented in state of the art UCPs. In this study, we describe how we enhance the Town Energy Balance in order to take fractional building use and human behaviour into account. We describe how we parametrise different behaviours and initialise the model for applications in France. We evaluate the spatio-temporal variability of the simulated building energy consumption for the city of Toulouse. We show that a more detailed description of building use and human behaviour enhances the simulation results. The model developments lay the groundwork for simulations of coupled urban climate and building energy consumption which are relevant for both the urban climate and the climate change mitigation and adaptation communities.

The strand of political theory that emphasises disruption of existing orders has generated a great deal of praise and criticism in geography and urban studies in the past few years. In this article, I address some conflicting interpretations of this strand, and describe what I see as its potential contribution. I emphasise how this strand of disruptive politics opens up new domains of inquiry by highlighting the contingency of established ways of engaging with and making sense of the world, and how it introduces a broadened, rather than limited, understanding of politics. The potential of this strand does not lie in its prescriptive or diagnostic uses, but in this opening up of politics by including practices that elude established institutions and routines.

Monitoring of dune erosion and accretion on the high-energy macrotidal Vougot beach in North Brittany (France) over the past decade (2004–2014) has revealed significant morphological changes. Dune toe erosion/accretion records have been compared with extreme water level measurements, defined as the sum of (i) astronomic tide; (ii) storm surge; and (iii) vertical wave runup. Runup parameterization was conducted using swash limits, beach profiles, and hydrodynamic (Hm0, Tm0,–1, and high tide water level—HTWL) data sets obtained from high frequency field surveys. The aim was to quantify in-situ environmental conditions and dimensional swash parameters for the best calibration of Battjes [1] runup formula. In addition, an empirical equation based on observed tidal water level and offshore wave height was produced to estimate extreme water levels over the whole period of dune morphological change monitoring. A good correlation between this empirical equation (1.01Hmoξo) and field runup measurements (Rmax) was obtained (R2 85%). The goodness of fit given by the RMSE was about 0.29 m. A good relationship was noticed between dune erosion and high water levels when the water levels exceeded the dune foot elevation. In contrast, when extreme water levels were below the height of the toe of the dune sediment budget increased, inducing foredune recovery. These erosion and accretion phases may be related to the North Atlantic Oscillation Index.

All the inhabitants of a city who participate in the choice of a place of residence are assumed to have a propensity to visit the urban centre. The distribution of residential locations is represented by a probability density surface whose horizontal plane projection is coextensive with that of the city. A spatially continuous system is thus defined in which it is shown that, under conditions of maximum entropy and subject to specific normalisation and cost constraints, the population is distributed in accordance with the negative exponential model of urban population densities.

Gralepois, M., C. Larrue, M. Wiering, A. Crabbé, S. Tapsell, H. Mees, K. Ek, and M. Szwed. 2016. Is flood defense changing in nature? Shifts in the flood defense strategy in six European countries. Ecology and Society 21(4):37. https://doi.org/10.5751/ES-08907-210437

Socio-economic and geographical inequalities in breast cancer mortality have been widely described in European countries and the United States. To investigate the combined effects of geographic access and socio-economic characteristics on breast cancer outcomes, a systematic review was conducted exploring the relationships between: (i) geographic access to healthcare facilities (oncology services, mammography screening), defined as travel time and/or travel distance; (ii) breast cancer-related outcomes (mammography screening, stage of cancer at diagnosis, type of treatment and rate of mortality); (iii) socioeconomic status (SES) at individuals and residential context levels. In total, n = 25 studies (29 relationships tested) were included in our systematic review. The four main results are: The statistical significance of the relationship between geographic access and breast cancer-related outcomes is heterogeneous: 15 were identified as significant and 14 as non-significant. Women with better geographic access to healthcare facilities had a statistically significant fewer mastectomy (n = 4/6) than women with poorer geographic access. The relationship with the stage of the cancer is more balanced (n = 8/17) and the relationship with cancer screening rate is not observed (n = 1/4). The type of measures of geographic access (distance, time or geographical capacity) does not seem to have any influence on the results. For example, studies which compared two different measures (travel distance and travel time) of geographic access obtained similar results. The relationship between SES characteristics and breast cancer-related outcomes is significant for several variables: at individual level, age and health insurance status; at contextual level, poverty rate and deprivation index. Of the 25 papers included in the review, the large majority (n = 24) tested the independent effect of geographic access. Only one study explored the combined effect of geographic access to breast cancer facilities and SES characteristics by developing stratified models.

The objective of this study was to explore individual and contextual-level characteristics associated with active (walking and cycling) and public transport as main travel modes for both non-commuting and commuting purposes, in residents of five European urban regions. We also described participant-reported motivations for modal choice for each journey purpose. The study used multilevel models to investigate cross-sectional associations of individual (i.e. age, gender, educational level) and contextual (defined by a combination of residential neighbourhood characteristics in typologies) characteristics with the choice of active and public transport as outcome. Based on an online survey of 6037 residents of Ghent and suburbs (Belgium), Paris and inner suburbs (France), Budapest and suburbs (Hungary), the Randstad (including the cities of Amsterdam, Rotterdam, The Hague and Utrecht in the Netherlands) and Greater London (United Kingdom), we observed associations with both individual and contextual characteristics. Results of the multilevel modelling show that the probability of using active or public transport as main mode varies depending on both individual and contextual characteristics. At individual level, relations with gender, age, education, weight status and having at least one child varied according to main transport mode and/or purpose. For example, overweight participants reported lower level of cycling for commuting and non-commuting travels than normal-weight participants. In the context of non-commuting travels, participants with one or more child reported less public transport use and more walking (vs participants without children). Among contextual-level variables, urban characteristics of the residential neighbourhood defined by four clusters (according to food environment, recreational facilities and active mobility opportunities) were associated with public transport and walking but not with cycling. For active transport the most important reasons were “I like to travel (on foot or by bike)” and “I want to be physically active” for both travel purposes. “Public transport facilities nearby” was indicated as the most important reason for public transport (for both trip purposes) – the second was “Journey time”. Our findings highlight the importance of exploring a combination of multiple correlates at individual and contextual level according to journey purposes and suggest that the role of health-related individual characteristics such as weight status need further exploration.

OBJECTIVE: Some characteristics of the built environment have been associated with obesity in youth. Our aim was to determine whether individual and environmental socio-economic characteristics modulate the relation between youth overweight and spatial accessibility to physical activity (PA) facilities and to food outlets. DESIGN: Cross-sectional study. SUBJECTS: 3293 students, aged 12 ± 0.6 years, randomly selected from eastern France middle schools. MEASUREMENTS AND METHODS: Using geographical information systems (GIS), spatial accessibility to PA facilities (urban and nature) was assessed using the distance to PA facilities at the municipality level; spatial accessibility to food outlets (general food outlets, bakeries and fast-food outlets) was calculated at individual level using the student home address and the food outlets addresses. Relations of weight status with spatial accessibility to PA facilities and to food outlets were analysed using mixed logistic models, testing potential direct and interaction effects of individual and environmental socio-economic characteristics. RESULTS: Individual socio-economic status modulated the relation between spatial accessibility to PA facilities and to general food outlets and overweight. The likelihood of being overweight was higher when spatial accessibility to urban PA facilities and to general food outlets was low, but in children of blue-collar-workers only. The odds ratio (OR) (95% confidence interval) for being overweight of blue-collar-workers children compared with non-blue-collar-workers children was 1.76 (1.25-2.49) when spatial accessibility to urban PA facilities was low. This OR was 1.86 (1.20-2.86) when spatial accessibility to general food outlets was low. There was no significant relationship of overweight with either nature PA facilities or other food outlets (bakeries and fast-food outlets). CONCLUSION: These results indicate that disparities in spatial accessibility to PA facilities and to general food outlets may amplify the risk of overweight in socio-economically disadvantaged youth. These data should be relevant for influencing health policies and urban planning at both a national and local level.

Résumé La rue est l’une des formes urbaines les plus emblématiques de la rupture avec le modernisme. Pourtant, les conséquences du « retour à la rue » ont rarement été analysées. Cet article montre qu’il est au cœur du système de sens et de valeurs qui a accompagné la gentrification des quartiers anciens populaires. Le retour à la rue présente deux volets : la convivialité et le mélange social des quartiers populaires traditionnels, et le rôle structurant de la trame viaire dans le paysage urbain traditionnel. Le volet social s’appuie sur des arguments très similaires à ceux mobilisés par les gentrifieurs pour valoriser l’ambiance de leur quartier et pour y justifier leur présence. Le volet paysager a été au cœur de la revalorisation de l’image des quartiers anciens populaires et a accompagné diverses politiques de réhabilitation.