Simulation of potential complex effect of urban greenery in urban canyon. Case study in Prague-Dejvice

0564945 - ÚI 2023 RIV AU eng A - Abstract
Geletič, Jan - Belda, M. - Bureš, Martin - Krč, Pavel - Resler, Jaroslav - Řezníček, Hynek
Simulation of potential complex effect of urban greenery in urban canyon. Case study in Prague-Dejvice.
2022 IAUC Virtual Poster Session: Conference Abstract book. Sydney: University of New South Wales, 2022. s. 121-121.
[IAUC Virtual Poster Conference 2022. 30.08.2022-01.09.2022]
R&D Projects: GA TA ČR(CZ) TO01000219
Grant - others:AV ČR(CZ) StrategieAV21/3
Program: StrategieAV
Institutional support: RVO:67985807
Keywords : urban greenery * street * air pollution * thermal comfort
OECD category: Meteorology and atmospheric sciences

ZÁKLADNÍ ÚDAJE: 2022 IAUC Virtual Poster Session: Conference Abstract book. Sydney: University of New South Wales, 2022. s. 121-121. ABSTRAKT: Cities in times of climate change are one of the most current and probably the most difficult challenges local governments face. Although a large number of adaptation strategies and climate plans have emerged recently, many have a common result (at least in Central Europe), the simplest and economically most advantageous solution is usually represented by urban greenery, primarily planting of trees. Greenery in urban environments is perceived as an essential element of the face of cities and its characteristics are automatically accepted by residents as positive. The negative effects of greenery in urban areas, apart from possible allergies, are practically not considered in urban planning. However, the impact of trees in cities, positive and negative, is a significant consequence of adaptation policies, as well as the associated costs of care. Many models, mostly micro-scale, analyze the potential effect of green adaptation measures in a realistic urban environment. But the commonly used models are rarely complex enough to model air quality and thermal properties on a fine enough scale. They are typically focused on one problem only, mostly on energy-related variables (surface/air temperature, biometeorological indices or mean radiant temperature, etc.). Situation in the street canyon is more complicated, because trees change energy balance and directly affect wind velocity. Moreover, to get valid results, proper models are not a guarantee without good quality and precise enough input data. This presentation explains and summarizes the latest findings on the positive and negative effects of greenery at the street level, which were analyzed using the LES-based PALM modeling system. Selected tree-planting scenarios were considered for a typical urban environment in Dejvice, a quarter in the Czech capital, Prague, confirming the inverse effect of greenery on biomeoterological versus air quality indicators (ie. improving thermal comfort may bring about an increase of air pollution concentrations).
Permanent Link: https://hdl.handle.net/11104/0336523