Microclimate and Thermal Comfort of Urban Forms and Canyons in Traditional and Modern Residential Fabrics in Bandar Abbas, Iran

Dalman, Masoud; Salleh, Elias; Sapian, Abdul Razak; Tahir, Osman Mohd; Dola, Kamariah; Saadatian, Omidreza

doi:10.5539/mas.v5n2p43

Cited by 14 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Esmaili and Fallah Ghalhari (2014a) studied climatic properties and bioclimatic potential of Iran at a seasonal scale using PET and concluded that the most favorable seasons in terms of thermal comfort are spring and fall, respectively. Dalman et al (2011) investigated the traditional and modern urban environment in Bandar Abbas in terms of thermal comfort using PET. The results of this study showed the traditional environment has more comfortable situation than the modern one.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive analysis of physiologically equivalent temperature changes of Iranian selected stations for the last half century

Roshan

Yousefi

Kovács

et al. 2016

Theor Appl Climatol

View full text Add to dashboard Cite

As a preliminary and major step for land use planning of the coming years, the study of variability of the past decades' climatic conditions with comprehensive indicators is of high importance. Given the fact that one of the affected areas by climatic change includes variability of thermal comfort, this study uses the physiologically equivalent temperature (PET) to identify and evaluate bioclimatic conditions of 40 meteorological stations in Iran. In this study, PET changes for the period of 1960 to 2010 are analyzed, with the use of Mann-Kendall non-parametric test and Pearson parametric method. The study focuses particularly on the diversity in spatio-temporal distribution of Iran's bioclimatic conditions. The findings show that the mean frequency percentage of days with comfort is 12.9 % according to the total number of selected stations. The maximum and minimum frequency percentage with values of 17.4 and 10.3 belong to Kerman and Chabahar stations, respectively. The findings of long-term trend analysis for the period of 1960-2010 show that 55 % of the stations have significant increasing trend in terms of thermal comfort class based on the Pearson method, while it is 40 % based on Mann-Kendall test. The results indicate that the highest frequency of days with thermal comfort in the southern coasts of Iran relates to the end of autumn and winter, nevertheless, such ideal conditions for the coastal cities of Caspian Sea and even central stations of Iran relate to midspring and mid-autumn. Late summer and early autumn along with late spring can be identified as the most ideal times in the west and northwest part of Iran. In addition, the most important inhibiting factors of thermal comfort prove to be different across the regions of Iran. For instance, in the southern coasts, warm to very hot bioclimatic events and in the west and northwest regions, cold to very cold conditions turn out to be the most important inhibiting factors. When considering the variations across the studied period, an increase in the frequency of thermal comfort condition is observed in almost half of the stations. Moreover, based on Pearson and Mann-Kendall methods, the trend of changes in monthly averages of PET has decreased in most stations and months, which can lead to different consequences in each month and station. Thus, it is expected that due to PET changes in recent decades and to the intensified global warming conditions, Iran's bioclimatic conditions change in a way that transfers the days with comfort to early spring and late autumn.

show abstract

Section: Introductionmentioning

confidence: 99%

A comprehensive analysis of physiologically equivalent temperature changes of Iranian selected stations for the last half century

Roshan

Yousefi

Kovács

et al. 2016

Theor Appl Climatol

View full text Add to dashboard Cite

show abstract

“…These planting recommendations might not be effective in another climatic zone. Even in the same climate conditions, the planting arrangement may vary according to different urban morphologies and distance from the sea (Johansson and Emmanuel, 2006) and cultural preferences (Dalman, Salleh et al, 2013) availability of water bodies and hard surface coverage (Jacobs, Klok et al, 2020;Manteghi, Mostofa et al, 2020), the type of public space and the specific morphological features such as aspect ratios, street orientation and sky view factor (Qaid, Lamit et al, 2018) for OTC improvements.…”

Section: Discussionmentioning

confidence: 99%

The Influence of Planting Arrangement on Outdoor Thermal Comfort

Dissanayake,

LWG,

UGD

2023

IRSPSD International

View full text Add to dashboard Cite

Vegetation provides significant benefits for urban thermal environments attracting people to open spaces. Especially in tropical climates, squares are more vulnerable to thermal discomfort due to surrounding buildings and increased hard surface coverage compared to urban parks. Since the space for planting is limited, a proper arrangement is essential to enhance the outdoor thermal comfort (OTC). Nevertheless, the impact of different planting arrangements on OTC has not yet been adequately discovered in tropics. This research conducts numerical simulations using ENVI-met software employing physiological equivalent temperature (PET) to understand how planting patterns affect microclimate and OTC at pedestrian level (1.5m) under clustered, scattered, and equally distributed planting arrangements. The methodology includes three stages; onsite measurements, assessment of existing OTC level, and comparison of the impact of planting arrangements on microclimate and OTC. The changes in the planting arrangements considerably affect OTC in urban outdoors altering the air temperature (Ta), wind speed (WS), mean radiant temperature (MRT), and relative humidity (RH). MRT and the WS are found as the most important parameters influencing thermal comfort, thus collaborating with previous studies. Equally distributed planting arrangement has a significant impact providing the highest comfort improvement (9.8 ℃ PET reduction) at the pedestrian level. Reduced canopy overlaps and planting densities, and improved homogeneous shade coverage and ventilation are suggested to overcome thermal discomfort. The cooling effect of native tree species should be assessed in future research. These results guide urban designers and landscape architects in improving microclimate and OTC in warm-humid cities.

show abstract

“…Martini e Biondi (2015) (2012), o microclima urbano é complexo e está relacionado com o ambiente externo. A densidade da área construída, a cobertura do solo, a altura dos edifícios, a orientação e a largura das ruas influenciam nas variáveis microclimáticas devido a quantidade de radiação solar recebida, e, consequentemente, na sensação de conforto térmico da população (Dalman et al, 2011;Thorsson et al, 2011;Shishegar, 2013). Em regiões tropicais, quanto mais adensado e verticalizado o espaço urbano, haverá incremento na temperatura e redução da umidade, pois os materiais impermeáveis absorvem e mantêm o calor, provocando o desconforto térmico (Martins et al, 2012).…”

Section: Discussionunclassified

Análise da Variação Microclimática em Diferentes Níveis de Fragmentação (Analysis of Microclimate Variation at Different Levels of Fragmentation)

Freitas

Santos

Lima

2016

Rev. Bras. Geog. Fis.

View full text Add to dashboard Cite

A fragmentação da vegetação inserida no ambiente urbano, decorrente da ocupação desordenada do solo, gera transformações significativas na dinâmica dos fatores termodinâmicos. Este trabalho analisa o sistema microclimático urbano, subsistema termodinâmico da Universidade Federal da Paraíba, em diferentes níveis de fragmentação. Foram realizadas coletas de dados de temperatura e umidade relativa do ar, em três pontos com diferentes fragmentações, durante os períodos: chuvoso (março a agosto) e seco (setembro a fevereiro). Também foi avaliado o nível de estresse térmico e foi efetuada a classificação dos tipos de cobertura de solo em cada ponto monitorado, resultando em nove classes, de acordo com a percentagem da presença de vegetação, de materiais permeáveis e de materiais impermeáveis, tendo sido utilizados métodos quantitativos e qualitativos. Os resultados demonstraram que os diferentes níveis de fragmentação da Mata Atlântica, no espaço urbano da UFPB, têm alterado o campo térmico, e consequentemente alterado também o conforto térmico desse espaço. Palavras-chave: Microclima, níveis de fragmentação, UFPB A B S T R A C TThe fragmentation of vegetation inserted in the urban environment, resulting from the disorderly occupation of soil, generates significant transformation in the dynamics of the thermodynamic factors. This paper analyzes the urban microclimate system, thermodynamic subsystem at the Federal University of Paraiba, in different levels of fragmentation. Temperature data collection and relative humidity were held at three points with different fragmentation during periods: rainy (March to August) and dry (September to February). It also assessed the level of thermal stress and it was performed the classification of the soil cover types at each point monitored, resulting in nine classes, according to the percentage of the presence of vegetation, for permeable materials and impervious materials, having been used quantitative and qualitative methods. The results demonstrated that the different levels of fragmentation of the Atlantic Forest, in the urban space from UFPB, have changed the thermal field, and consequently also changed the thermal comfort of this space.

show abstract

Microclimate and Thermal Comfort of Urban Forms and Canyons in Traditional and Modern Residential Fabrics in Bandar Abbas, Iran

Cited by 14 publications

References 10 publications

A comprehensive analysis of physiologically equivalent temperature changes of Iranian selected stations for the last half century

A comprehensive analysis of physiologically equivalent temperature changes of Iranian selected stations for the last half century

The Influence of Planting Arrangement on Outdoor Thermal Comfort

Análise da Variação Microclimática em Diferentes Níveis de Fragmentação (Analysis of Microclimate Variation at Different Levels of Fragmentation)

Contact Info

Product

Resources

About