Spatial statistical analysis and simulation of the urban heat island in high-density central cities

Chun, Bumseok; Guldmann, Jean‐Michel

doi:10.1016/j.landurbplan.2014.01.016

Cited by 294 publications

(143 citation statements)

References 37 publications

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“…Yunhao studied the radiation temperature variation of south, east, and west walls in the daily changing cycle [14], indicating that the architecture layout indicators affect the changing characteristics of the spatial pattern of UHI. Chun explored the relationship between 2D and 3D forms and UHI in central cities through remote-sensing images [15]. The results show that the UHII increases with the increase of building density, but the study also fails to pay attention to the change in the time scale.…”

Section: State Of the Artmentioning

confidence: 98%

Scale response of summer urban heat island to building plot ratio and its warning parameter

Huang

Yun

et al. 2017

Teh. vjesn.

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Original scientific paperPlot ratio is an important indicator of architectural layout that affects urban heat island (UHI). Previous studies focus on street height/weight ratio, building density, and other indicators related to plot ratio but fail to effectively describe the time-space relationship between plot ratio and UHI and accurately guide the planning and design to reduce the UHI in the effective scale. The scale sensitivity method was proposed to study the time-space response of UHI to plot ratio to control the UHI intensity (UHII) caused by plot ratio during planning and design in a reasonable scale. The sensitivity of plot ratios in different space scales to UHI in the daytime was repeatedly calculated on 3S technology, MATLAB, SPSS, and other data analysis platforms based on the scale theory of landscape ecology and the method of geo-statistics analysis. The change curve of the response of plot ratio on UHI in the most sensitive space scale was discussed. The prevention and control standard of summer UHI was then constructed in accordance with the temperature in dog days of summer, human physiological reaction under high temperature, and relevant national regulations. The warning control was taken on the parameters of plot ratio on the basis of the temperature rise of UHI caused by plot ratio. Results show that scale sensitivity exists between plot ratio and UHI. In the daytime, the relationship between core plot ratio and summer UHI shifts from negative correlation to positive correlation. The temperaturerising effect in the afternoon is greater than the cooling effect in the morning. Core plot ratio has a linear relationship with summer UHII. The increase in the average core plot ratio reduces the UHII by 0,76 °C in the morning and increases it by 0,97 °C in the afternoon. The optimal sensitive radius of the core plot ratio on summer UHI is 230 m. The response mechanism of plot ratio on UHI is mainly due to heat storage volume and block to radiation heat. The study conclusion can provide scientific theoretical parameter support for architectural design and urban planning and design.Keywords: core plot ratio; scale sensitivity; summer; UHII; warning parameter Reakcija urbanog toplinskog otoka ljeti na omjer građevne čestice i njezin parametar upozorenjaIzvorni znanstveni članak Omjer građevne čestice je značajan pokazatelj arhitektonskog rasporeda koji utječe na urbani toplinski otok (UHI -urban heat island). Prethodna su istraživanja usredotočena na omjer visina/težina, gustoću zgrada i ostale pokazatelje povezane s omjerom građevne čestice, ali ne uspijevaju uspješno opisati odnos vrijeme-prostor između omjera građevne čestice i UHI te točno voditi planiranje i projekt kako bi se smanjila učinkovitost UHI-a. Metoda stupnja osjetljivosti predložena je za analiziranje reakcije vrijeme-prostor UHI-a na omjer građevne čestice u svrhu reguliranja intenziteta UHI (UHII) do kojeg je došlo prihvatljivim omjerom građevne čestice tijekom planiranja i projektiranja. Osjetljivost omjera građevnih čestica u raz...

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Section: State Of the Artmentioning

confidence: 98%

Scale response of summer urban heat island to building plot ratio and its warning parameter

Huang

Yun

et al. 2017

Teh. vjesn.

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“…9;2015 due to re-radiation from surrounding buildings and other objects. In addition, an increasing the amount and duration of rainfall as well as its intensity and frequency are usually paid vital role in increase of lag time between air and room temperature because of low heat conductivity of lightweight-concrete walls to transmit into room (Alchapar et al, 2014;Chun & Guldmann, 2014;Skoulika et al, 2014;Akbari et al, 1992;Sellers, 1965). The said condition could make the lag difference in both the maximum and minimum temperature about 2 hours owning to low heat conductivity of lightweight-concrete walls.…”

Section: Lag Time Temperaturementioning

confidence: 99%

“…9, No. 9;2015 Shahidan et al (2012) while Chun & Guldmann (2014) to introduce the roof-top green cover and water areas as well as giving vegetative courtyard and city parks to deduct urban temperature by Mangone & Linden (2014), Skoulika et al (2014), McPherson (1988), Takebayashi et al (2014) and Ng et al (2012); and also making higher reflecting roof by Alchapar et al (2014). Theoretically, an incoming heat protection by tree planting, pond construction, green patches around the cities or houses, and green-top-roof buildings in urban heat island would be the most important to reduct ambient air temperature due to make them away from exactly sources and sink in heat transfer by re-radiation and heat absorption before re-radiation taking place (Gates, 1965;1980;Hartman, 1994;Geiger, 2003;Perez et al, 1999;Chunkao, 1979;Bowen 1926).…”

mentioning

confidence: 99%

“…In contrary, when there is no available water and plants, the earth surface heat has to utilize to heat air as sensible heat (H) which is the most important heat to make high temperature outside buildings, and also inside building after heat transferring through the walls (Zhang et al, 2013;Sun & Augenbroe, 2014;Shahidan et al, 2012;Ketterer & Matzarakis, 2014;Santamouris, 2001;Oke et al, 1991;Lokoshchenko, 2014;Honjo & Takakura, 1990;Chun & Guldmann, 2014;Maimaitiyiming et al, 2014;Santamouris, 2014). As stated before, the architects have tried to look for insulated materials for cooling inside buildings and households due to deducting transferred heat from outside buildings and households but depending on types of insulated materials.…”

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confidence: 99%

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Lag Time of Heat Conduction in Conditions of Growing Greenery Cover on Flattop-Concrete Roof of Single-Room House with Lightweight-Concrete Walls as Constructed on Narrow Space in Bangkok

Suwansumrit¹,

Chunkao²,

Bualert³

et al. 2015

MAS

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Growing greenery cover on flattop-concrete roof of single-room house with lightweight-concrete walls for lagging heat conduction was experimented during 10 August-30 November 2014 at Kasetsart University on narrow space between the College of Environment and car park buildings which emphasized on minimum room size of 2.5 m width, 2.5 m length, and 2.5 m height as declared by Building Control Act 1990. The methods of study were conducted by installing air thermometers at distance from the house and one meter above ground in northerly, southerly, easterly, westerly and flattop-concrete roof by alternating closing and opening the door and window. The research results found the maximum room temperature ranging 34.5-35.5 o C and minimum 26.5-27.7 o C for closing door and closing window, then decreasing almost being equal from degree of opening door and window, and clearly changing in conditions of long duration, high intensity, and often frequency of rainfall. Using Pudsaon or Cape Jasmine (Gardenia jasminoides J.Ellis) as grown in experimental pots containing coconut flake due to its characteristics of more consuming phreatophyte with high rate of using water for evapotranspiration process that can absorb surrounding heat through converting process to become latent heat flux. In consequence, room temperature was lowered down to 24.5 o C and following by decreasing lag time from 2 hours to 0.5 hours, and also different lag time from 1-2 hours to 0.5-1.5 hours which were indicated better comfortable living. Closing both door and window or either one could not be conditioned for everyday lifestyle of people in dense and populated Bangkok city. In addition, construction of single-room house with flattop-concrete roof and lightweight-concrete walls were surely eligible to protect heat transferring from hot air outside into room rather than from room to outside, except opening both door and window at the same time

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“…As a result, several studies analyzing the relationship between sky view factor and air temperature for both day and night have reported slightly different results [24,25,33,35]. These differences are attributed to the different number of samples, study area, and other weather factors such as wind and humidity.…”

Section: Introductionmentioning

confidence: 99%

Association between Three-Dimensional Built Environment and Urban Air Temperature: Seasonal and Temporal Differences

Park

Lee

2017

Sustainability

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Climate change and the urban heat island phenomenon are increasingly important issues in urban thermal environments. However, there is a lack of research on the relationship between three-dimensional built environments and air temperature. Therefore, the purpose of this study is to provide policy suggestions that could be used to improve urban thermal environments by analyzing the effect of the three-dimensional built environment of an urban space on the urban air temperature according to changes in time (i.e., season, time of day). Using data from 236 automatic weather stations (AWSs) in Seoul, Korea, this study focused on three-dimensional built environmental variables and land use variables that affect air temperature in terms of season and time. The analysis results indicate that the sky view factor and porosity were lower in urban areas, with higher sky view factor and porosity values associated with lower air temperature. This study also indicates that surface roughness is higher in urban areas, with higher surface roughness associated with higher air temperature. These results suggest that urban design practices should consider the three-dimensional built environment when planning urban development and urban regeneration projects in order to improve the urban thermal environment.

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Spatial statistical analysis and simulation of the urban heat island in high-density central cities

Cited by 294 publications

References 37 publications

Scale response of summer urban heat island to building plot ratio and its warning parameter

Scale response of summer urban heat island to building plot ratio and its warning parameter

Lag Time of Heat Conduction in Conditions of Growing Greenery Cover on Flattop-Concrete Roof of Single-Room House with Lightweight-Concrete Walls as Constructed on Narrow Space in Bangkok

Association between Three-Dimensional Built Environment and Urban Air Temperature: Seasonal and Temporal Differences

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