M. Vuckovic, W. Loibl, T. Tötzer, R. Stollnberger:
"Potential of Urban Densification to Mitigate the Effects of Heat Island in Vienna, Austria";
Environments, 6 (2019), Vol. 7; 12 S.

Global increase of urban population has brought about a growing demand for more
dwelling space, resulting in various negative impacts, such as accelerated urbanization, urban sprawl
and higher carbon footprints. To cope with these growth dynamics, city authorities are urged to
consider alternative planning strategies aiming at mitigating the negative implications of urbanization.
In this context, the present contribution investigates the potential of urban densification to mitigate
the heat island e ects and to improve outdoor thermal conditions. Focusing on a quite densely
urbanized district in Vienna, Austria, we carried out a set of simulations of urban microclimate for
pre- and post-densification scenarios using the parametric modelling environment Rhinoceros 3D
and a set of built-in algorithms in the Rhino´s plug-in Grasshopper. The study was conducted for a
hot summer period. The results revealed a notable solar shielding e ect of newly introduced vertical
extensions of existing buildings, promoting temperature decrease and improved thermal conditions
within more shaded urban canyons and courtyards. However, a slight warming e ect was noted
during the night-time due to the higher thermal storage and lower sky view factor.

urban heat island; urban densification; solar radiations shielding; climate adaptationmeasures

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