The influence of vertical canopy structure on the cooling and humidifying urban microclimate during hot summer days

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41320%2F23%3A97130" target="_blank" >RIV/60460709:41320/23:97130 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.landurbplan.2023.104841" target="_blank" >http://dx.doi.org/10.1016/j.landurbplan.2023.104841</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.landurbplan.2023.104841" target="_blank" >10.1016/j.landurbplan.2023.104841</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The influence of vertical canopy structure on the cooling and humidifying urban microclimate during hot summer days

Popis výsledku v původním jazyce

Urban forests can mitigate urban heat effectively during hot summer days. Their cooling effects are largely determined by the plant canopy structure, which can be classified into three features: canopy density and horizontal and vertical canopy structures. This study aimed to identify the contribution of these canopy structural features to cooling effect of urban forests and how their contribution varies during the day. Near-surface air temperature and relative humidity were measured repeatedly between 07:00 - 10:00, 11:00 - 14:00, 16:00 - 19:00 and 21:00 - 24:00 during 16 summer days of 2021 using a mobile monitoring system at five urban parks and representative reference areas in Shanghai. To measure canopy structural features around each measurement point with a scale of 5 m, 10 m and 20 m radius buffers, each park was scanned by an unmanned aerial vehicle (UAV) laser scanner and an UAV multiple-spectrum image system. We found vertical canopy structure had great importance in explaining cooling effects and even exceeded the magnitude of air temperature reductions caused by leaf area index and canopy coverage during noon and nighttime. With increasing foliage height diversity (FHD), the cooling effect first decreased and then increased, when the turning point of FHD was approximately 0.5. Generally, sites with a high canopy coverage and an unevenly distributed canopy (FHD < 0.3) in high layers are recommended to provide better cooling effects in summer. Along with canopy density and horizontal structure, vertical canopy structure must be considered to optimize the cooling potential of urban forests in future planning.

Název v anglickém jazyce

The influence of vertical canopy structure on the cooling and humidifying urban microclimate during hot summer days

Popis výsledku anglicky

Urban forests can mitigate urban heat effectively during hot summer days. Their cooling effects are largely determined by the plant canopy structure, which can be classified into three features: canopy density and horizontal and vertical canopy structures. This study aimed to identify the contribution of these canopy structural features to cooling effect of urban forests and how their contribution varies during the day. Near-surface air temperature and relative humidity were measured repeatedly between 07:00 - 10:00, 11:00 - 14:00, 16:00 - 19:00 and 21:00 - 24:00 during 16 summer days of 2021 using a mobile monitoring system at five urban parks and representative reference areas in Shanghai. To measure canopy structural features around each measurement point with a scale of 5 m, 10 m and 20 m radius buffers, each park was scanned by an unmanned aerial vehicle (UAV) laser scanner and an UAV multiple-spectrum image system. We found vertical canopy structure had great importance in explaining cooling effects and even exceeded the magnitude of air temperature reductions caused by leaf area index and canopy coverage during noon and nighttime. With increasing foliage height diversity (FHD), the cooling effect first decreased and then increased, when the turning point of FHD was approximately 0.5. Generally, sites with a high canopy coverage and an unevenly distributed canopy (FHD < 0.3) in high layers are recommended to provide better cooling effects in summer. Along with canopy density and horizontal structure, vertical canopy structure must be considered to optimize the cooling potential of urban forests in future planning.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10618 - Ecology

Projekt

<a href="/cs/project/EF16_019%2F0000803" target="_blank" >EF16_019/0000803: Excelentní Výzkum jako podpora Adaptace lesnictví a dřevařství na globální změnu a 4. průmyslovou revoluci</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Landscape and Urban Planning

ISSN

0169-2046

e-ISSN

0169-2046

Svazek periodika

238

Číslo periodika v rámci svazku

2023

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

1-12

Kód UT WoS článku

001049707100001

EID výsledku v databázi Scopus

2-s2.0-85165136697