Sky view factor and its effects on thermal comfort in realistic urban environment

0572667 - ÚI 2024 RIV US eng A - Abstract
Geletič, Jan - Lehnert, M. - Krč, Pavel - Resler, Jaroslav - Krüger, E.
Sky view factor and its effects on thermal comfort in realistic urban environment.
23rd International Congress of Biometeorology - Abstract Book – Monday, May 15. Tempe: Arizona State University / International Congress of Biometeorology, 2023. s. 20-20.
[International Congress of Biometeorology /23./. 14.05.2023-17.05.2023, Tempe]
R&D Projects: GA TA ČR(CZ) TO01000219
Institutional support: RVO:67985807
Keywords : sky view factor * biometeorology * large-eddy simulation * PALM
OECD category: Meteorology and atmospheric sciences
https://biomet23.asu.edu/wp-content/uploads/sites/25/2023/05/ICB2023_Abstracts_MonMay15.pdf

ZÁKLADNÍ ÚDAJE: 23rd International Congress of Biometeorology - Abstract Book – Monday, May 15. Tempe: Arizona State University / International Congress of Biometeorology, 2023. s. 20-20. [International Congress of Biometeorology /23./. 14.05.2023-17.05.2023, Tempe]. ABSTRAKT: The Sky View Factor (SVF) is a commonly used indicator of urban geometry. The availability of pedestrian-level SVF measurements has been fairly limited due to the high costs of field survey. Modern modelling approaches are based on precise GIS databases combining advantages of precise SVF calculation in fine-scale resolution and simulation of thermal comfort variables. In this contribution, we would like to present SVFs modelled in the PALM modelling system using Radiative Transfer Model (RTM) version 3.0 and their effect on thermal comfort in pedestrian level. The SVF in PALM is calculated explicitly by ray tracing. The algorithm takes into account all the resolved 3-D obstacles such as terrain and buildings (fully opaque) and plant canopy (semi-transparent depending on the resolved leaf area density), and its performance benefits greatly from the fact that most scenes contain only a limited amount of overhanging structures (i.e. the rest is a so-called 2.5-D geometry). The view from each calculated grid cell is discretized by a configurable fixed number of azimuth and elevation angles for which the rays are traced. We will demonstrate different effects of SVF including transparency of plant canopy on thermal comfort during heat-wave episode in Prague-Dejvice. Moreover, we will to discuss principles how to maximize mitigation effects of urban greenery in a complex urban environment using the large-eddy simulation model PALM.
Permanent Link: https://hdl.handle.net/11104/0343275