Urban Surface Module for model PALM

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985807%3A_____%2F16%3A00467446" target="_blank" >RIV/67985807:_____/16:00467446 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21260/16:00307287 RIV/68407700:21730/16:00307287

Výsledek na webu

<a href="https://palm.muk.uni-hannover.de/trac/browser/palm/trunk/SOURCE/urban_surface_mod.f90" target="_blank" >https://palm.muk.uni-hannover.de/trac/browser/palm/trunk/SOURCE/urban_surface_mod.f90</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Urban Surface Module for model PALM

Popis výsledku v původním jazyce

Urban areas are an important part of the climate system. Many aspects of urban climate have a direct effect on human health and living conditions. This implies the need for a reliable tool for climatology studies that supports urban planning and development strategies. However, a realistic implementation of urban canopy processes still poses a serious challenge for weather and climate modelling for the current generation of numerical models. Therefore, a new model of energy processes for urban environments was developed as an Urban Surface Model (USM) and integrated as a module into the large-eddy simulation (LES) model PALM. The USM contains a multi-reflection radiation model for short and long wave radiation, calculation of the energy balance on horizontal and vertical impervious surfaces, thermal diffusion in ground, wall and roof materials and anthropogenic heat from transportation. The module also models absorption of radiation by resolved plant canopy. The USM was parallelized using MPI and the model scales well on typical cluster configurations. Performance tests demonstrate that the computational costs of the USM are very moderate in the context of PALM’s other processes. Most of the additional computational time with USM enabled can be attributed to increased turbulent flow leading to a shortened model time step. The module was fully integrated into PALM and is available via its online repository under GNU General Public License. The implementation was tested on a summer heat wave in the real conditions of a selected Prague crossroad. General patterns of temperature of various surface types are in good agreement with observations. The coupled LES-USM system appears to correct the bias found between observations and mesoscale model predictions for the near-surface air temperature. The PALM-USM provides a new useful tool for climatology studies of urbanized areas, and has been successfully used to simulate urban development scenarios for the city of Prague.

Název v anglickém jazyce

Urban Surface Module for model PALM

Popis výsledku anglicky

Urban areas are an important part of the climate system. Many aspects of urban climate have a direct effect on human health and living conditions. This implies the need for a reliable tool for climatology studies that supports urban planning and development strategies. However, a realistic implementation of urban canopy processes still poses a serious challenge for weather and climate modelling for the current generation of numerical models. Therefore, a new model of energy processes for urban environments was developed as an Urban Surface Model (USM) and integrated as a module into the large-eddy simulation (LES) model PALM. The USM contains a multi-reflection radiation model for short and long wave radiation, calculation of the energy balance on horizontal and vertical impervious surfaces, thermal diffusion in ground, wall and roof materials and anthropogenic heat from transportation. The module also models absorption of radiation by resolved plant canopy. The USM was parallelized using MPI and the model scales well on typical cluster configurations. Performance tests demonstrate that the computational costs of the USM are very moderate in the context of PALM’s other processes. Most of the additional computational time with USM enabled can be attributed to increased turbulent flow leading to a shortened model time step. The module was fully integrated into PALM and is available via its online repository under GNU General Public License. The implementation was tested on a summer heat wave in the real conditions of a selected Prague crossroad. General patterns of temperature of various surface types are in good agreement with observations. The coupled LES-USM system appears to correct the bias found between observations and mesoscale model predictions for the near-surface air temperature. The PALM-USM provides a new useful tool for climatology studies of urbanized areas, and has been successfully used to simulate urban development scenarios for the city of Prague.

Druh

R - Software

CEP obor

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OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Interní identifikační kód produktu

USM

Technické parametry

Model pro výpočet energetických poměrů v komplexním prostředí městské zástavby zahrnující např. multireflexní radiační model, model energetické bilance povrchů materiálů, model šíření tepla v materiálech a model antropogenního tepla z dopravy. Model je napsán v jazyce Fortran 90 a paralelizován pro HPC pomocí MPI-2 rozhraní. Model je plně integrován do mikroměřítkového atmosférického modelu PALM a umožňuje tak v rámci modelu PALM detailně modelovat proudění a energetické poměry v městském prostředí včetně vlivu vegetačního pokrytí.

Ekonomické parametry

Mezi dostupnými CFD-LES modely vhodnými pro simulaci proudění v komplexním městském prostředí jsme nenašli žádný model umožňující modelovat energetické poměry tohoto prostředí. Nově vytvořený model USM byl integrován do LES modelu PALM a stal se jeho oficiální součástí. Je dostupný pod stejnou licencí GPL jako zbytek modelu PALM na stránkách Univerzity v Hannoveru.

IČO vlastníka výsledku

68407700

Název vlastníka

Czech Technical University in Prague