Urban Sprawl in the Mediterranean Urban Regions in Europe and the Crisis Effect on the Urban Land Development: Madrid as Study Case
The middle of 2007 saw the beginning of a worldwide financial crisis that led to a sharp reduction in investment based on construction and urban development. This new situation is generating a new process, characterised by a slowdown that has almost reached a standstill when compared with the frenzied development of previous decades. In order to analyse these processes, this study examines urban land use changes and the urban growth rate and spatial dynamics of the metropolitan region of Madrid. The analysis has been carried out on a large scale between two periods (2000–2006 and 2006–2009) using a regional land use geodatabase. The results show the changes in the urban land use dynamics that took place over these two periods that could characterise the cities of Mediterranean Europe, where contrarily to the general pattern in Europe built-up areas are combining scattered built-up areas with new aggregated compact developments.
Intensification of urbanization across all regions of the globe, together with the greater ease of cartographic land use data handling through GIS and remote sensing techniques, have led to a proliferation of these kinds of studies in recent years. Analysis of urban expansion in cities in the developing world has become more and more frequent [1–5]. Likewise research on the rapid growth of Asian cities is becoming increasingly abundant (see [6, 7] or ). In Europe, the studies which deal with urban sprawl approaches are prevalent. In many cases, especially in Mediterranean regions, this kind of approach is habitually faced from a dualistic perspective, that is, transition from compact to more dispersed growth models, associated with phases of sprawl (see, e.g., [9–17]).
Nevertheless, urban expansion is characterized by a high degree of complexity . It does not occur in all regions at the same degree, at the same pace, or in the same way. Rather, it must be approached and understood taking into account specific geographical and historical contexts in which particular urban forms shape cities . For this reason some authors note that difficulties that may arise when attempting to study urban growth based on concepts and, above all, indicators, from North American paradigms. Jiang et al.  observe that sprawl indices applicable elsewhere may not be directly applied to the Chinese context. In Mediterranean cities, Catalán et al.  have warned that urban trends do not necessarily follow the North-American model and outcomes may differ with respect to the situation found on the other side of the Atlantic. The polarization that this implies would seem to need a critical reconsideration of the problem. In particular, to investigate whether some kind of hybrid process of urban change can be identified in European and, more specifically, Mediterranean, cities.
The impact of the severe economic crisis that began in 2007 should also be considered, as its effects have been particularly drastically felt in Mediterranean countries. The crisis has not braked the metropolitan expansion, but it has affected the model of the city itself. In Spanish cities, whose model of growth has been heavily dependent on construction sector, the crisis has evidently put a stop to urban growth. In addition, however, as Florida  has emphasized, the crisis has presented an opportunity to revisit recent developments offering more sustainable urban developments. That is, between other things, more compact urban developments with suitable densities of population which endow a fair space for inhabitants, not wasting the land, a high diversity of land uses and urban designs which permits high ratios of sustainable mobility, less based on car commuting and oriented to the public transport.
This work aims on one hand, to assess the urban land use patterns, trends, and the evolution of Madrid during the first decade of the XXI century, as an European Mediterranean metropolitan region in the context of the urban sprawl, over all linked to the residential developments. In that sense this study shows parallelisms with other similar urban development models that have already been pointed out for other European urban regions like Barcelona or Athens [19, 21], which sustain the existence of a kind of a hybrid urban model (between the hyper-sprawled cities and compact cities). On the other hand, the present work attempts to evince the change experienced on the urban growth trends for the mentioned European urban regions in relation with the recent crisis that is hitting Europe (since 2007).
This study analyzes the evolution of the metropolitan area of Madrid and its land use dynamic over the last decade (2000–2009). The work deals with a period and a metropolitan region of great interest. The accelerated construction dynamic known as the “tsunami urbanizador español” (Spanish urbanization tsunami) of the 1990s  was accentuated by the implementation of a metropolitan model at every stage more dispersed and of lower density between 2000–2006. This model was characterized by an accelerated urban land dynamic where the low interest rates of the loans encouraged the projects related with the land market. The urban growth model was not only linked to the economic model, but the Spain economy was strongly supported by the urban and infrastructures developments. During the period 1995–2008 were built in Spain more than 6 million of dwellings at the same time that the land increased three times is price, and the property loans were multiplied by ten. The credit flowed from all the corners of the planet which caused a strong indebtedness in all the sectors but especially into the domestic economies .
After 2006, the situation is quite different. The property crash has resulted in the paralysis of the majority of new residential developments, now mostly confined to small-scale urban transformations in the inner-city areas. The debt crisis and the public deficit have shut down investment in new infrastructure and services and direct changes associated with both of these have disappeared accordingly. At the same time, the difficult situation in which private investors and businesses find themselves puts a brake on the emergence of new activity on the city’s outskirts, precisely those areas that were so dynamic in the preceding decade.
The growth of the European cities during the preceding decade could insignificant since a global perspective and taking into account the extraordinary urbanization rates in China, India, Brazil, and the traditional mega-cities of North-America and Japan. Nonetheless, detailed studies of the urban land expansion and its structure into the European context and more specifically on a Mediterranean urbanization framework can help to understand the urban transformation during the preceding decade.
The work presented here was undertaken using land use maps for the Madrid region for the years 2000, 2006, and 2009. This cartographic dataset, denominated “Madrid Land-Use” (MLU), is a large scale (1 : 10,000) land use database showing a high level of detail and was developed by the research team through photographic interpretation. The well-known Corine Land Cover (CLC) database, which covers most European Union countries and some adjacent states, for example, Turkey, available from the European Environment Agency (EEA), offers land use and land cover information at a maximum scale of 1 : 100,000 and at present covers the periods 1990, 2000, and 2006.
Moreover, CLC is one of the most frequently used sources for analysis of land use in Europe (see, e.g., [15, 16, 24–27]). It also has the advantage of being developed in coordination between participating countries, something that lends it great value in making comparisons between European regions with respect to land use and land cover change. Nevertheless, when more precise knowledge of land use change is required from the point of view of urban land occupation at a regional scale, databases such as MLU aim to fill this vacuum by providing urban land use information only obtainable at scales of detail in excess of 1 : 10,000 through exhaustive analysis based on photointerpretation.
This paper is divided into six sections. Following this introduction, in Section 2 there is a brief literature review about the urban sprawl; then, the city of Madrid is presented as the study area in Section 3. In Section 4, the data and methodology used in the analysis are introduced, together with discussion of the contribution of this work in the light of previous research. In Section 5, the results are presented; changes in land use, dynamics of dispersal, and fragmentation, and changes in net population densities that have come about as a result. Finally, in Section 6, a discussion of the results is given and the principal conclusions are presented.
2. A Brief Literature Review of the Urban Sprawl in the European Context
Urban sprawl has long been key topic in geography and other disciplines . Urban sprawl is characterized by single family dwellings, lending uniformity to the urban landscape, reducing metropolitan density, and leading to fragmentation of urban spaces [29–31]. This kind of growth is not only a major driver of environmental change [32, 33] but also reaps high economic and social costs [34, 35]. The most abundant work in this area being above all that dedicated to recognizing the emergence of urban sprawl through various methods along with comparison of the phenomenon between cities (e.g., [11, 36–41]).
Sprawl is a term hard to pin down and not easy to measure, but currently there is certain scientific agreement and a recognition of its negative effects on sustainability, from the urban planning agencies. Gillhan  was not far to make a good description of sprawl when affirmed that the “sprawl” shows itself startlingly clear from the jet plane window at thirty thousand feet: “huge expressways snake out over the land, generating a wide, loosely formed network across the world below” [38, page 13]. Sometimes, these kinds of appreciations are more understandable than a set of measures on densities, geometric shapes, diversity of land uses, spatial statistics, or landscape metrics. Nonetheless, numbers are extremely necessary following the planning management principle that “we cannot manage what we do not measure.” Urban sprawl needs, as many other human phenomena, from both approaches to be explained, the qualitative and the quantitative, in order to cover all the characteristics to be identified.
Urban sprawl seems to be a common feature of the metropolitan suburban areas in the last twenty years in the European Union. The EU cities, following distantly the North American metropolis like Los Angeles or the urbanized Northeastern Megalopolis of the United States  are timidly reproducing the extended, discontinuous, low-density, and fragmented spaces in the periphery of the city centre. The immediate consequences of this type of urban forms are those related with the transport, where the flow networks, more complex and disperse, make longer the travel distances and the trip times, producing an excess on commuting .
The sprawl is characterized by an extended low-density urban land use pattern, mostly residential, and covering a vast number of hectares, in order to supply the demand of these housing developments associated to the new commercial forms of the city, the malls. The residential developments spread into a competition by the land taking with the agriculture activity and natural areas and produce the irreversible transformation of the cropland, pastures, and forests. Nonetheless, the extensive land taken is not the only socioeconomic and environment impact that has been pointed out for the urban sprawl. A lack of scale economies, that make more complicated the public services distribution; all those derivate effects from the overload of the private cars transit, like the increase of the energy consumption or the air pollution; and the shocks in the ecosystems are caused by the scattered urban development .
Although the sprawl phenomenon is relatively new in the so-called “Mediterranean European compact cities,” nowadays it becomes unavoidable to describe their urban landscape . The Joint Research Centre brought out a report in 2006 very concerned about the urban sprawl in Europe through analysis made over the MOLAND database at local scale and CORINE Land Cover database at European level. In this report the sprawl is described as “the physical pattern of low-density expansion of large urban areas[…]Development is patchy, scattered and strung out, with a tendency for discontinuity[…]full of empty spaces that indicate the inefficiencies in development and highlight the consequences of uncontrolled growth” . In the same direction, the UN-HABITAT on its “State of the World’s Cities 2012-2013” report has pointed out the advantages of the compact urban development, contrary to the unsustainable urban sprawl which produces higher infrastructure costs, worst access to services and facilities, and a major social segregation [47, page 94].
For the period 2000–2006, CLC indicates that the urban sprawl keeps being extremely important in Europe and especially remarkable in Spain where this phenomenon was more intense for economic sites and infrastructures (Figure 1).
In this work, as it will be explained in the methodology section, we deal with the urban sprawl over all in terms of residential net densities and measuring the size of the new urban patches and the distance between them.
3. Study Area
The study area corresponding to the Madrid Autonomous Community is divided for administrative purposes into 179 municipalities (Figure 2). In 2009, the total population was 6,390,000 million inhabitants, half of whom lived in the central city (Madrid municipality) (Table 1). In the last 10 years, the Madrid region has developed in an extraordinarily dynamic way. The principal growth in absolute terms has occurred in the first ring of suburban municipalities and in the core city itself, indicating the demographic recovery of these areas, which saw population decline in the 1990s. However, in relative terms, demographic growth seemed to be proportionately greater in the more distant rings of the outer city. This dispersion of population was accompanied by a process of employment decentralization.
The expansion of urban land use in the Madrid metropolitan area during the 1990s was spectacular in the European context. According to CLC, urban land increased by more than 30,000 ha, an annual growth rate of 4.77%, when the population grew scarcely 0.8% a year. Furthermore, in these years the surface area under construction grew by 200% [25, 26]. In Spain, only some coastal cities have had greater rates of urban land growth than Madrid . The European Environment Agency signalled the Madrid region as one of the European Union’s urban growth hotspots .
This dynamic of land use growth was related to a legislative framework which facilitated the entry of vast quantities of land onto the market. Municipal administrations, by way of land planning instruments, discovered a licit method of financing and economic reactivation that made possible the sale of great quantities of land [49, 50]. The existence of investment capital and in many cases, the gamble taken by the construction sector in terms of a marked focus toward real estate, translated, in the Spanish case, into unprecedented urban expansion.
The growth of built-up areas has been characterized by the growth of residential land, above all by the more dispersed and lower density urban development patterns. The CLC database shows that, between 1990 and 2000, the compact residential areas category grew 13%, while the dispersed urban areas category (open urban structures and detached urban areas with or without gardens) grew 42.5%. Aside from the residential spaces, land related to economic activities also grew strongly. Industrial land grew 107% and became each time more strongly characterized by location on the city’s fringes and strongly related to the development of the road network (see ). Moreover, between 1990 and 2000, new urban development’s showed little diversity of uses, a characteristic of more compact developments.
For the period 2000–2006, CLC indicates that the urban sprawl keeps being extremely important in Europe and especially remarkable in Spain where this phenomenon was more intense for economic sites and infrastructures (Figure 1).
Madrid region is a good example of the above pointed out urban sprawl dynamic in Europe and at the beginning of the present century the intensity of changes in this metropolitan area has provoked a real economic, sociodemographic and morphological metamorphosis in a short space of time. Nevertheless, its recent evolution shows changes to this dynamic, and the outbreak of the economic crisis in EU and more accentuated in the European Southern region, where according to the IMF, their GDP per capita will be lower in 2017 than it was in 2007 . It presupposes a new wave of change, but this time of different nature. By understanding the compression of cause and effect of these processes through analysis of land use change in the Madrid region can also help to explain similar urbanization processes that have taken place throughout Mediterranean cities.
4. Data and Methodology
In Europe the majority of the analysis of land use dynamics is carried out using Corine Land Cover (CLC) cartography. The advantage of CLC is the possibility it offers for comparison of land use dynamics across the various European regions that have participated in the project (see, i.e., [52–54]). In the Madrid region, CLC has been employed to explain land use evolution [25, 26], the explanatory factors behind such evolution, and the ways to obtain predictive models for exploring the future land use evolution .
Nevertheless, CLC presents problems relating to its application in analysis of urban dynamics, fundamentally due to the scale at which the work was carried out. Catalá et al.  have detected errors using cross-tabulation analysis between 1990 and 2000, localizing and analyzing “unusual” changes. This study concludes that 68% of these unusual changes correspond to errors in category assignment for land use/land cover mapped. On the other hand, Feranec et al.  have identified underestimations in the analysis of land use change 1990–2000 due to the amalgamation of the residual parts of polygons smaller than 25 ha with neighbouring polygons.
In order to overcome the problems with CLC, this work uses the MLU mapping, which relates to urban land use in the Madrid region in 2000, 2006, and 2009. MLU differentiates 7 urban land classes on the level 2 of disaggregation, which is used at the present work: 2 residential classes (multihousehold and single-household), industrial, office and retail, facilities, urban green, and infrastructures. Data capture was carried out at a high level of detail, the basic scale of reference for the digitization work being 1 : 10:000, with 100 m2 as the minimum mapped unit. The technical procedure did not include any kind of automatic or computer-aided classification, being carried out in its entirety by photointerpretation of high resolution (0.5 m) aerial orthophotos, with the support of topographic map information for the Community of Madrid (scale 1 : 1000) as well as cadastral maps (1 : 5000) . By comparing CLC and MLU mapping using confusion matrices Díaz-Pacheco and Gutiérrez  have found that the spatial coincidence of urban land use between each data base is around 80%.
Geographical Information Software (GIS) was used to analyze the land use changes. Land use gains and losses were analyzed, both at a general level and according to rings representing distances from the core city (every 10 km).
With the aim of analysing the impact of the new low density development types, net population densities were calculated using the total population at municipal level and the surface area of urban residential land use, both single and multihousehold. Additionally, in order to measure the degree of fragmentation amongst land uses, landscape metrics were applied, for example, the number of patches of different uses, their average size, or the distances between the new urban land use patches those already existing (see [59, 60] or ).
Finally, maps were calculated showing kernel densities for change areas. These maps allow the reasoning behind the location of the most dynamic areas to be identified and the new central focus points in the periurban areas to be located .
5.1. A Slowdown of the Urban Expansion?
Between 2000 and 2009, urban land use grew 19.4%, at an annual rate of 2.2% (Figure 3, Table 2). This increase has occurred at a time of population growth. In fact, the population has grown at a faster pace than the urban land use (See Table 1). The annual growth rate for urban land uses from 2000 to 2006 was 2.4%, with a clear deceleration from 2006 onwards (a rate of 1.4% annually).
These data break with the tendency for the consumption of artificial land per person to grow observed in the preceding decades. For the first time in many years, the available built up area per inhabitant declined, from 171.2 m2/inhabitant in 2000, to 169.8 in 2006 and 166.6 in 2009 (this increase in urban land, at a time of demographic stagnation, meant a notable increase in the built-up area available to each person, which in only five years (1996 to 2001) went from 153 to 179 m2 per inhabitant ).
By classes, the residential land use occupies almost 50% of the total artificial land. Within the residential class, single-household dwellings already characterize the majority of Madrid’s periurban metropolitan landscape. The single-household dwellings category is the most extensive of all of the urban land uses (34% of the total in 2009, against 14% residential multihousehold dwellings), but at the same time they house a much smaller population . But between 2000 and 2009, the rate of growth of single-household residential areas is much less than is the case for multihousehold dwellings. Indeed, the residential multihousehold is the only class that has increased its rate of growth in the last three years, while single-household dwellings rate has decreased (Table 2). This tendency represents a break with the preceding decade and the sprawl model. Nevertheless, many of the new multihousehold developments are also associated with low-rise buildings, with a small number of homes and open plan housing estates [49, 62].
The expansion of artificial land results also from the strong growth of other not residential activities (Table 2). The land uses that grow the most between 2000 and 2009 are those related to service activities and infrastructures, particularly in the six years of economic growth. Service activities grow 9.7% annually, green and sports areas at 2.9% annually, and infrastructures at 2.1%. However, both green and sports areas and infrastructures have seen notable reduction in the rate of growth in the last 3 years.
If we compare the expansion of the urban area with the population, significant differences can be noted (Figure 4). The rate of population growth is greater than that of the urban area and affects the spaces that are furthest away from the city centre. The highest growth rates, both in terms of population and urban area, occur in the third ring. But while the values for percentage population growth are greater in the outermost rings (fourth, fifth, and sixth), in terms of urban area, growth is greater in the second ring, and even in Madrid municipality itself (the core city), the values are not greatly different from those for the most distant rings. The growth of urban land shows a less marked expansion than the population dynamic, a situation that becomes even more pronounced for the latest years.
By land use types, the greater part of the multihousehold residential spaces is located in the city of Madrid, along with facilities and services, tertiary uses and the infrastructures themselves. On the other hand, the surface area taken up by single-household dwellings extends strongly in the metropolitan fringe, with a much shallower fall-off towards the outside of the city. Industrial land is also strongly represented in the second and third rings (Figure 5).
5.2. An Increase in Net Population Density
The net population density in the metropolitan area of Madrid grew from 118 inhabitants/hectare in 2000 to 125 in/ha in 2009, an increase of 5.8%. The net densities are very high in the city of Madrid (320 in/ha) and in the first ring (140 in/ha), but decline strongly in the outermost rings (Figure 6). During these years a tendency towards greater densification in the outermost rings can be shown. The highest rates of population growth of the residential areas lead to a growth of net density throughout all of the metropolitan rings, but brings stronger growth in the outermost and most dynamic rings. By contrast, the net population density remains constant on the central spaces and in the first ring. Between 2006 and 2009 the growth in population density and its expansion to the outermost rings has become less intense.
The changes in the population density distribution affect the configuration of the metropolitan model of Madrid itself. Besides of the core-periphery gradient, Madrid has always shown a remarkable difference between the large metropolitan municipalities of the south and east, with densities above 250 in/ha and areas of lower density and single-household dwellings in the north and, above all, in the west of the city . The evolution of the net population density shows declining density in the densely populated municipalities of the south and east. Conversely, in the north and to an even greater extent in the west, population density has notably increased, in particular in the first 6 years of greater dynamism (Figure 7). A general negative correlation can therefore be identified between net density in the year 2000 and the change in net density between the two periods (Figure 8).
5.3. The Fragmentation of Land Uses
In addition to low densities, growth dynamics associated with sprawl can be characterized by a higher discontinuity and a greater fragmentation of the urban developments. In Madrid, the number of urban land use patches had an annual increase of 0.85%. The average size and standard deviation of the patches also increased. The average size passed from 19.6 ha in 2000 to 21.7 ha in 2009, an increase of 1.2% in average size. The majority of the new urban patches appear between 2000 and 2006. On the other hand, the average size of the patches increased more strongly in the second period (Tables 3 and 4).
This tendency shows a transition from more disposed development to a return towards development of a more compact and contiguous type.
The distance between the new urban land patches and those already in existence also decreased (Table 5). The average distance between new and existing patches 2000–2009 is 410 metres. Nonetheless, the distance between existing patches and those created between 2000 and 2006 is considerably greater (almost 25%) than for those created between 2006 and 2009.
5.4. The Logic behind the Distribution of Land Use Changes
To identify the logic behind the location of the new developments in the decade 2000–2009, density maps of the new developments were calculated (Figure 9). The maps show how the changes tend to be concentrated in particular areas, fundamentally at the intersections of high-capacity roads, reinforcing the polycentric model that had been developing in the previous decades.
In the case of the residential areas, the multihousehold dwellings tend to be concentrated in the environs of the orbital transport corridors of the first and second metropolitan rings, most strongly in the north and west of the metropolitan area (Figure 9). The intensity of these changes is greater between 2000 and 2006 than in the period of the crisis, but the location of the developments initiated in the second period reinforces these tendencies (Figure 9). The single-household residential areas are located further from the core city (Figure 9). The location of the new developments related with economic activities exhibits two very different patterns. On the one hand, the new developments associated with services tend to configure a clearly polycentric model, with locations strongly related to the high capacity road network and a very marked north-west tendency (Figure 9). Conversely, industrial activities show strong dispersion and fragmentation, with numerous locations in outermost rings and less dependent on the high capacity road network (Figure 9).
The preceding maps show how different land uses present, in some cases, similar spatial distributions. This tendency is clearer in the new developments of the north and west of the metropolitan area. The tendency shows another behaviour from the land use changes of previous decades, in the sense that while the 1980s and 1990s saw the configuration of a model with scarcely any mixture of uses, the present metropolitan subcentres tend to comprise spaces with a much greater mixture of uses (see Figure 10).
6. Discussion and Conclusions
The metropolitan area of Madrid experienced a phase of intense urban expansion at the end of the last century. The urban land surface area grew at a rate in excess of 4% per year and the spaces at the furthest remove from the core city showed the highest rates of growth . Madrid should be considered as one of the leading exponents of sprawl in the Mediterranean and one of the hotspots in Europe to this respect (see report ). However, between 2006 and 2009, a change to this tendency can be noted. Despite demographic recovery, in particular in the innermost rings, the expansion of urban land reduced sharply. This tendency is very noticeable from 2006 onwards, a period that included the beginning of a serious economic recession in Europe and especially in Mediterranean countries. The majority of the research which is undertaken by investigating the transition from compact towards dispersed urban form (see, e.g., [3, 16, 21, 24, 63]). The concept of sprawl is derived from the description of the patterns of expansion of North American metropolitan areas over the last 50 years. From North America, the concept has been applied to analyze the urban growth in all regions of the world, to such a point that it has become another umbrella surrounded by a controversy regarding its features, causes, and effects. In general terms, urban sprawl is a type of urban growth characterized by a low-density, dispersed spatial pattern with both environmental and social impacts [29–31, 41]. It is clear that the structure of European cities generally has become less compact, and this is also the case in Mediterranean. However, urban trends do not necessarily follow the North-American model and outcomes may differ with respect to the situation found at the other shore of the Atlantic [11, 19].
Already prior to the crisis, Madrid presented an evolution very different to the previous decades. Growth of urban land is lower, even despite the demographic recovery. This evolution breaks with the strong growth in consumption of land which characterized the evolution of Madrid in the 1990s; in fact, the urban surface area per inhabitant has reduced in the last decade. As a result, net population densities have increased. In Madrid, a “hybrid model” has become consolidated, and that means an intermediate between sprawl and the compact city, something that Catalán et al.  already identified in Barcelona. This hybrid model is characterized by high-rise dwellings which are of course multihousehold, but, in contrast to the characteristic dwellings of Madrid’s core city or the compact metropolitan municipalities, have fewer floors and extensive open spaces and green areas. In contrast to the North-American or North European suburbs, the expansion of the residential spaces results not so much from the deployment of two or two and a half storey dwellings (single-household terraced), as from those of four to six storeys (blocks of moderate height). Although the urban landscape thus becomes more horizontally distributed and less compact and corresponds to a lower intensity in new urban developments, the numerical prevalence of the so-called vivienda colectiva (multihousehold dwelling) [61, 62]. These kinds of new spaces tend to homogenize the distribution of population density. In the western outskirts, a traditionally single-household area, density has increased. At the same time, in contrast, in the traditionally compact areas of the southern metropolitan area, densities have declined.
Furthermore, in this paper we have analyzed the urban expansion of Madrid by means of landscape metrics using land use cartography and GIS, an approach that is much used for analysis of changes in land use patterns and sprawl models [24, 59, 64, 65]. The results show how the expansion of Madrid between 2000 and 2009 can be differentiated from sprawl not only on the basis of the increase in densities, but also on because of the lesser fragmentation and spatial dispersion. The number of new urban land use patches reduces and the patch size grows. It is significant that while in the residential single-household spaces, existing patches increase in size, the new patches are fundamentally associated with the new multihousehold developments. Between the uses related to economic activities, only in industrial uses is the tendency to dispersion maintained, while amongst the tertiary areas, the sports and green areas a polycentric model is consolidated. In the metropolitan subcentres, there appears moreover a combination of land uses, breaking with another of the typical characteristics of sprawl. In synthesis, in the metropolitan area of Madrid, the present processes of expansion do not involve the random and chaotic dispersion of residential spaces or other periurban activities; rather, they are linked to the improvement and densification of the transport networks. On the other hand, the dynamics of proximity are far from losing their relevance. The new subcentres in suburban contexts attract activity and population.
In this way, a polycentric growth model has intensified, again in accordance with expansion tendencies detected in other Mediterranean metropolitan areas [19, 21]. In Madrid, a model with elements of polycentrism has become established, corresponding to the consolidation of urban subcentres articulated through nodes of high accessibility, with its own dynamic and the capacity to influence the functional structure of the city .
The strong urban expansion of the 1990s in most Mediterranean areas was in part supported by the impotence of planning control, in many cases as a consequence of the existence of a strong administrative fragmentation (municipalities) and the lack of a common policy for the metropolitan area as a whole [21, 67], elements that are key to understanding the evolution of Madrid. However, in the last decade, as in other Mediterranean areas, a series of actions have aimed to reorient planning and introduce measures to control dispersion. Undoubtedly, these actions have been able to contain urban growth, reducing the pace of urban land expansion in the early years of the new millennium, a period of strong economic growth. The appearance of the crisis could be seen as an opportunity to turn the clock back on Madrid’s recent evolution and dispense with a model of expansion that has generated serious problems of sustainability and merits correction through policies aimed to rebalance and redirect the dynamics underway [61, 68]. A detailed knowledge of land use change is fundamental for such a task.
Conflict of Interests
The authors declare that there is no conflict of interests regarding the publication of this paper.
This paper was developed by researchers from the Complutense University of Madrid with financial support from the Ministerio de Ciencia e Innovación (Project TRA2008-06682 and Project TRA2010-19788).
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