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SUMMARY:How Cities Grow: Universal Roughness\, Urban Sprawl\, and an Inter
 mezzo on Scaling
DTSTART:20260528T090000Z
DTEND:20260528T100000Z
DTSTAMP:20260527T135500Z
UID:indico-event-1841@indico.dfa.unipd.it
DESCRIPTION:Speakers: Marc Barthelemy (IPhT (Paris))\n\nUrban sprawl resha
 pes cities worldwide\, yet its spatial dynamics are still largely describe
 d in qualitative or descriptive terms.\nIn this seminar\, I will present a
  quantitative framework for urban expansion inspired by non-equilibrium su
 rface growth physics. Using high-resolution built-up area data and histori
 cal population records for 19 cities across multiple continents\, the work
  reveals anisotropic\, branch-like expansion patterns and identifies two c
 ompeting growth mechanisms: smooth local accretion at the urban fringe and
  abrupt coalescence with surrounding clusters. Despite the diversity of ur
 ban trajectories\, a universal local roughness exponent close to 1/2 emerg
 es\, while global growth exponents vary widely\, highlighting the roles of
  anisotropy\, coalescence\, and heterogeneity in shaping urban form.\nI wi
 ll also discuss what urban scaling laws can\, and cannot\, mean in this co
 ntext\, emphasizing the distinction between aggregate cross-sectional regu
 larities and the actual temporal dynamics of individual cities.\nLocation:
  Aula Vigna (Via Jappelli 1)\n\nhttps://indico.dfa.unipd.it/event/1841/
URL:https://indico.dfa.unipd.it/event/1841/
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