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Cutini & Rabino - input2012

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Valerio Cutini and Giovanni Rabino on "The urban growth: development, sprawl and spatial configuration"

Valerio Cutini and Giovanni Rabino on "The urban growth: development, sprawl and spatial configuration"

Published in: Technology, Real Estate

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  • 1. Valerio Cutini Giovanni RabinoThe urbangrowth Development, sprawl and spatial configurationSeventh International Conference on Informatics and Urban and Regional Planning Cagliari, 10-12 May 2012
  • 2. Contentsvalerio cutinigiovanni rabino Introduction The configurational approach, in short Urban development and configuration Some case studies Conclusions
  • 3. Would you draw a city?valerio cutinigiovanni rabino
  • 4. Our thesisvalerio cutinigiovanni rabino The connections are assumed as the primary to be assumed as the raison d’etre ofd’etre of the city primary raison the city The relation between the activities and the urban grid is its actual making mechanism The genesis of an urban grid appear to follow appears to follow some constant and recurring dynamics, which materialize in its spatial relations Such dynamics can be revealed by means of a configurational approach
  • 5. Configuration and morphologyvalerio cutinigiovanni rabino Lorini In a configurational approach, as focused on the relations between spatial elements, any geometric and morphologic feature vanishes system graph Scamozzi
  • 6. Contentsvalerio cutinigiovanni rabino Introduction The configurational approach, in short Urban development and configuration Some case studies Conclusions
  • 7. The configurational approachvalerio cutinigiovanni rabino Three assumptions can be recognized at the root of the configurational approach to the analysis of urban settlements The decisive influence of urban structure on the phenomena occurring inside The importance of the perceptive appraisal of space in the behavioural choices of its users The assumption of the urban grid as the primary element of the urban structure
  • 8. The configurational analysisvalerio cutinigiovanni rabino The configurational analysis of an urban settlement can be summarized as follows Definition of the urban grid Reduction of the urban grid into a system of connected spatial elements Computation of the spatial relation between the elements Determination of the parameters that represent the relational state of the system configurational indices
  • 9. Some configurational indicesvalerio cutinigiovanni rabino connectivity The number of spatial elements connected to the observed one integration The mean topologic distance (depth) from all the other elements of the system global integration local integration
  • 10. The configurational techniquesvalerio cutinigiovanni rabino The way of reducing the urban grid into a system is the distinguishing element of the several operational techniques axial analysis visibility graph analysis spatial lines vertices elements connection elements points uniformly distributed all between convex spaces over the grid relation intersection mutual visibility system axial map visibility graph
  • 11. Axial analisys and VGA: Sienavalerio cutinigiovanni rabino The integration value in the lines of the axial map The urban grid of Siena The integration value in the vertices of the visibility graph
  • 12. Configuration and activitiesvalerio cutinigiovanni rabino Siena The configuratrional analysis is The results show a hence proved suitable for narrow(esponential) reproducing the distribution of correlation between the Volterra the levels of centrality within density of activities and the an urban settlement integration value
  • 13. Contentsvalerio cutinigiovanni rabino Introduction The configurational approach, in short Urban development and configuration Some case studies Conclusions
  • 14. A small examplevalerio cutinigiovanni rabinoIntegration value 64 lines Correlation of local integration versus global integration 3.88512 3.11819 3.02162 2.83209 4.60934 R² = 0.999461 0.628534 0.787503 0.866043 0.941414 1 line 32 lines 16 lines 256 lines 128 lines Integration [HH] R3 0.422392 0.824669 0.795544 0.617794 0.590638 0.624947 0.872037 Integration [HH] 2.50006 2.33192 2.27936 2.48376 4.60934
  • 15. Contentsvalerio cutinigiovanni rabino Introduction The configurational approach, in short Urban development and configuration Some case studies Conclusions
  • 16. The diachronic genesis of Grossetovalerio cutinigiovanni rabino Distribution of integration value in Grosseto in the period 1825-2005 (axial analysis) 1935 date 1825 1910 1950 1980 2005 nr. lines 78 109 367 487 629 CM 15.5 11.6 7.2 7.0 1825 5.7 1975 1960 Imin/Imax 0.28 0.34 0.38 0.40 0.42 2005 R2 (Iglo/Iloc) 0.89 0,83 0,82 0,76 0,59
  • 17. The diachronic genesis of Pisavalerio cutinigiovanni rabino Distribution of integration value in Pisa in the period 1825-2005 1910 1980 (axial analysis) 1950 1825 2005 date 1825 1910 1950 1980 2005 nr. lines 371 455 637 936 1159 CM 9.65 8.43 8.30 7.13 6.64 Imin/Imax 0.28 0.28 0.34 0.33 0.37 R2 (Iglo/Iloc) 0.87 0.82 0.64 0.64 0.57
  • 18. Findings. 1valerio cutinigiovanni rabino As the system dimension increases from its primigenial core, the connectivity mean value decreases As the system dimension increases, the ratio Imin/Imax too increases As the system dimension increases, the R2 value in the correlation of local integration versus global integration progressively decreases Grosseto Pisa Any development of the grid involves the addition of new lines, mostly in the outer ring, whose main features are poor values of connectivity and global integration, but not necessarily poor values of local integration nr. lines nr. lines
  • 19. Findings. 2valerio cutinigiovanni rabino The growth of a settlement involves the development of an inner core, generally characterized by high values of global integration and connectivity, as well as new development areas, characterized by poor values of the same indices If we assume connectivity and R2 as indicators of the resilience of the system, we can regard the inner core as the place of urban resilience, while the edges of the urban area can be regarded as the place of urban frailty Such spatial notions appear changing right along as the settlement grows, in that the edges get progressively more resilient as new development areas are added
  • 20. Contentsvalerio cutinigiovanni rabino Introduction The configurational approach, in short Urban development and configuration Some case studies Conclusions
  • 21. Conclusionsvalerio cutinigiovanni rabino Cities appear as dendritic systems, irradiating from their inner core to the farthest development areas Their spatial structure seems to be induced by a general principle of optimization, aimed at urbanizing new areas and connecting them to the existing settlement Some configurational features appear so recurring as to characterize the new areas with respect to the pre- existing ones In such view, even the common notions of periphery and sprawl can be interpreted as the material appearance of a system of spatial relations in its ongoing evolution
  • 22. valerio.cutini@ing.unipi.itgiovanni.rabino@polimi.it Thank you