Search results for "sprawl"
showing 10 items of 58 documents
Per una dimensione slow della città diffusa
2013
The city which sprawls through a territory no longer has spacial boundaries; consequently the urban system leads to a noticeable and unavoidable increase in the need for mobility. This mobility has a “fondamental” role in urban sustainablity (these themes are present in many studies). The contemporary city is organized only for people who use cars and does not help people to move freely; Illich said that it’s only possible to have “productive social relationships” at cycling speed and we say that slow mobility can contribute to a better "quality of life in cities”. This paper will consider the role of this type of mobility in a particular case study: a sprawling city – characterized only by…
Aspects and problems of changing economic utilization of the land in Italy and the corresponding soil consumption
2013
The study moves from the observation that, in the last fifty years (1961-2010) the territory of our country, like those of other countries with advanced economies, has undergone extensive economic processes of change in the use of land, mostly due to a strong reduction of Agricultural Area Use (AAU), whose consistency - on the basis of official statistics (National Statistics Institute) and, in particular, the results of the General Census of Agriculture - is estimated at around 7,8 million hectares, from 20, 7 million hectares in 1961 to 12,9 million in 2010. It should be noted in fact that the intensity of the processes of reduction of the UAA was much greater in the first three decades, …
Fractal geometry for measuring and modelling urban patterns
2007
Urban growth generates nowadays patterns, which look rather irregular. Planning policy regrets the lack of compactness and density of these agglomerations, but controlling urban sprawl turns out to be difficult. Obviously a new type of spatial organisation emerges, which is rather the result of a self-organisation process to which a high number of social agents contribute. In the present contribution we focus on the use of fractal geometry which turned out to be a powerful instrument for describing the morphology of these patterns. After an introduction about the context of research, fractal models are presented, which serve as reference models for better understanding the spatial organisat…
Employment Density in Ile-de-France: Evidence from Local Regressions
2009
In recent decades, cities have experienced a particularly intense phase of urban sprawl. Urban growth has been characterized by the spatial concentration of population in urban areas and the concomitant extension of those urban areas (Nechyba and Walsh 2004). Urban sprawl has also been accompanied by major reorganizations of urban areas with regard to the location choices of households and firms. More specifically, most cities in developed countries have experienced several waves of suburbanization of economic activities: “an economic definition of suburbanization is a reduction in the fraction of a metropolitan area’s population or employment that is located in the central city (correspond…
Clustering cities through urban metrics analysis
2017
[EN] This paper describes a process for measuring and characterizing urban morphological zones. These urban zones are delineated for the entire area of Spain, independently of administrative boundaries and excluding demographic data, using a high resolution land-use dataset. Given the rich information available on land cover and subsequently assigned population data, it is possible to calculate a set of urban spatial metrics to classify these urban zones into homogenous morphological groups. Four types of urban agglomerations are identified in Spain by working with these urban metrics and applying a final cluster analysis. Although these groups have a general complex monocentric typology, e…
¿Metrópolis dispersas?
2010
La cuestión de la dispersión urbana constituye hoy un tema de investigación alrededor del cual se ha ido concentrando el interés disciplinar y político-institucional. Tal interés encuentra su respuesta en datos estadísticos (EEA, 2006) que confirman que: el 75% de la población europea vive en áreas urbanas; más de un cuarto del territorio europeo resulta urbanizado, y según las estimaciones en 2020 aproximadamente cerca del 80% de los europeos vivirá en áreas urbanas. Es un campo de la investigación todavía abierto y sobre el cual este trabajo de tesis ha querido reflexionar, siendo consciente que en urbanismo el conocimiento es una acción cognitiva y, al mismo tiempo, proyectual. Por lo ta…
The impractical supremacy of the local identity on the worthless soils of Mappano
2016
Introduction Soil is under pressure worldwide. In Italy, in the last two decades, land consumption has reached an average rate of 8 m2, demonstrating the failure of urban planning in controlling these phenomena. Despite the renewed recognition of the central role of soil resources, which has triggered numerous initiatives and actions, soil resources are still seen as a second-tier priority. No governance body exists to coordinate initiatives to ensure that soils are appropriately represented in decision-making processes. Global Soil Partnership draws our attention to the need for coordination to avoid fragmentation of efforts and wastage of resources. Both at a global and at a local level, …
How green neighbourhoods make cities more compact?t? A 2D microeconomic perspective
2014
National audience; We analyse the emergence of scattered residential development, a key characteristic of sprawl. We analyse a 2D urban economic model with neighbourhood interactions among households (social contacts) and with farmers (who produce green amenities). Starting from a cross-shaped road network and CBD, we analytically establish the existence and characteristics of residential leapfrogging that breaks up the compact development of the city. We extend our analysis by numerical experiments based on observed or econometrically estimated parameters. We nd that the shape of built up areas in uences the decision or not to jump over undeveoped land or to stick to the contiguous urban f…
Fractal dimension versus density of built-up surfaces in the periphery of Brussels
2007
International audience; This paper aims at showing the usefulness of the fractal dimension for characterizing the spatial structure of the built-up surfaces within the periurban fringe. We first discuss our methodology and expectations in terms of operationality of the fractal dimension theoretically and geometrically. An empirical analysis is then performed on the southern periphery of Brussels (Brabant Wallon). The empirical analysis is divided into two parts: first, the effect of the size and shape of the windows on the fractal measures is empirically evaluated; this leads to a methodological discussion about the importance of the scale of analysis as well as the real sense of fractality…
Managing Metro Manila
2017
Metro Manila residents are confronted everyday with the challenges of flooding, substandard housing and horrendous traffic. In this low altitude plain, any significant rainfall raises water levels in many small streams, and contributes to traffic jams. The rapid population growth of the metropolis has led to the proliferation of squatter areas, including alongside flood-prone rivers and railroad tracks. The lack of discipline and of decent garbage management contribute in turn to a worsening of floods when streams are covered with litter. The fast rise in motorization rates, coupled with the many imperfections of the public transport system, make Manila one of the most congested cities in t…