Temporal Variations of Urban Heat Island Intensity in Three Major Cities, Thailand

Jongtanom, Yenrutai; Kositanont, Charnwit; Baulert, Surat

doi:10.5539/mas.v5n5p105

Cited by 25 publications

(10 citation statements)

References 18 publications

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“…The mean maximum urban heat island intensity in three major cities in Thailand had positive thermal contrasts, indicating that the air temperatures at the urban sites were higher than at rural sites [1]. The present expansion of city area is intensifying the urban heat island phenomenon, and the high ambient temperatures radiating from concrete infrastructure and buildings are problematic to the living standards of city residents.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Drought Endurance of Landscaping Ground Cover Plants in a Roof Top Model

Pichakum

2021

Horticulturae

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Vegetative ground covers are commonly used in urban, tropical roadside gardens. Such landscaping ground covers usually encounter extreme water-deficits and high temperatures from vehicles and urban infrastructures. However, information about the plant species that are appropriate for low maintenance gardens is not available, especially in tropical areas. This study aimed to investigate potential indicators for evaluating plant tolerance to water-deficit situations. A non-irrigated rooftop model was used to test 25 commercial ground cover species in a greenhouse at Mahidol University, Nakhon Pathom Province, Thailand. Each of these 25 species was potted and subjected to one of two conditions: with or without irrigation for 7 days. Physiological responses relevant to plant endurance during water-deficits were monitored, including changes in leaf relative water content (RWC), percent stomatal opening, leaf surface temperature, leaf total chlorophyll content, leaf greenness, maximum quantum yield, and light quantum yield. Moreover, an additional indicator of landscape utility was evaluated, where each species was judged by trained panelists for their esthetic appeal. Diverse responses were observed based on the type of physiological parameter measured, plant species, and duration of drought conditions. Water withdrawal for three days was deemed an appropriate time to determine plant tolerance to water-deficit conditions, as signs of stress were clearly observed in three parameters, i.e., changes in leaf RWC, percent stomatal opening, and esthetic score. Lastly, cluster analysis revealed that seven plant species were appropriate for tropical, urban ground covers, as they had high endurance under water-deficit conditions, namely, Allium schoenoprasum,Liriope muscari, Aloe sp., Sedum x rubrotinctum, Alternanthera ficoidea, Pilea libanensis and Plectranthus scutellarioides.

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Section: Introductionmentioning

confidence: 99%

Evaluating the Drought Endurance of Landscaping Ground Cover Plants in a Roof Top Model

Pichakum

2021

Horticulturae

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“…A number of UHI-related studies have been conducted for the province but varied greatly in type of UHI, objec-pioneered UHI investigation, Boonjawat et al [15] employed air temperature data measured in from a private network of automated stations to assess UHI in Bangkok and supplemented discussion using some landscape and satellite images. Jongtanom et al [16] reported preliminary results on the average diurnal and monthly variations of UHII in three selected major provinces (including Bangkok). Pakarnseree et al [17] related seasonal change in air temperature in terms of cooling rate for various subdivisions over the city to their physical landscape properties (street/park/water/building spaces and building-floor area) in four separate years starting from 2000.…”

Section: Introductionmentioning

confidence: 99%

Urban heat island analysis for Bangkok: multi-scale temporal variation, associated factors, directional dependence, and cool island condition

Kamma¹,

Manomaiphiboon²,

Aman³

et al. 2020

ScienceAsia

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This study analyzed urban heat island characteristics in Bangkok, observed during a period of 10 years (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015) with emphasis on the dry season when the urban heat island is intensified in both daytime and nighttime as compared to the wet season. December-January was found to be the months of peak urban heat island intensity (UHII) in terms of average. The intensity is relatively large at night due to the faster cooling rate during the early evening at the rural site whose thermal admittance of land surface is lower than the urban site. UHII is slightly larger during the weekdays than the weekend, suggesting certain degree of influence of anthropogenic heat emitted in the urban area. UHII is negatively correlated with most of rain, cloud, relative humidity, and wind speed variables. The assessment of polar plots shows UHII dependence on wind direction. The statistical regression models relating UHII to selected meteorological variables are capable of explaining the variability of the original data by 82% for daytime UHII and 66% for nighttime. Southwesterly wind direction and persistence were found to be important in modulating UHII, and both appear in the final regression models. The presence of dry-season cool island events was also investigated, and it was found that they are generally induced by the high intensity of urban-alone/urban-rural rain, cloud, relative humidity, or urban wind speed (or combined). Overall, the findings from the study provide enhanced perspectives, which can support urban policy and planning related to weather for the study area.

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“…The topic has also been studied in Thailand, e.g. using remote sensing technology from satellite imagery to assess the UHI in large cities where large changes in land utilization have occurred, including Bangkok [41][42][43][44][45], Chiang Mai [43,46], Songkhla [43] and Mahasarakram [16]. However, Nakhon Ratchasima has not been studied, despite its rapid urbanization and major changes in land utilization.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Land Surface Temperature and Land Use in Nakhon Ratchasima City, Thailand

Chotchaiwong¹,

Wijitkosum²

2019

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The relationship between land surface temperature (LST) and land use in Nakhon Ratchasima was studied using data gathered from three satellite images from Landsat-5 (30th January 1992), Landsat-8 (9 May 2016) and THEOS (17th February 2016). There were four categories of land use: built-up area, green area, bare land and water sources. The split-window concept was used to estimate the LST. In 1992, Nakhon Ratchasima city in Thailand comprised 47.76% built-up area, 37.45% green area, 13.19% bare land and 1.60% water sources. By 2016, the built-up area had increased by 23.04%, the green area had decreased by 16.66%, bare land had decreased by 6.81%, but water sources had increased by 0.43%. Moreover, in 1992 the mean LST was 25.43 C for built-up areas, 24.44 C for green areas, 24.97 C for bare land and 24.75 C for water sources. However, by 2016 the LSTs had increased for each category: 28.74 C for built-up areas (+3.31 C), 27.20 C for green areas (+2.76 C), 28.11 C for bare land (+3.14 C) and 27.72 C for water sources (+2.97 C). The findings indicated that the LSTs increased with the pace of urbanization and changes in land use. Linear regression analysis revealed that built-up land had a positive correlation with LST, where a 1% increase in built-up area increased its LST by 0.146594 C.

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Temporal Variations of Urban Heat Island Intensity in Three Major Cities, Thailand

Cited by 25 publications

References 18 publications

Evaluating the Drought Endurance of Landscaping Ground Cover Plants in a Roof Top Model

Evaluating the Drought Endurance of Landscaping Ground Cover Plants in a Roof Top Model

Urban heat island analysis for Bangkok: multi-scale temporal variation, associated factors, directional dependence, and cool island condition

Relationship between Land Surface Temperature and Land Use in Nakhon Ratchasima City, Thailand

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