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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985807%3A_____%2F23%3A00572667" target="_blank" >RIV/67985807:_____/23:00572667 - isvavai.cz</a>

Result on the web

<a href="https://biomet23.asu.edu/wp-content/uploads/sites/25/2023/05/ICB2023_Abstracts_MonMay15.pdf" target="_blank" >https://biomet23.asu.edu/wp-content/uploads/sites/25/2023/05/ICB2023_Abstracts_MonMay15.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10509 - Meteorology and atmospheric sciences

Project

<a href="/en/project/TO01000219" target="_blank" >TO01000219: Turbulent-resolving urban modeling of air quality and thermal comfort</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů