Role of the urban vegetal in improving the thermal comfort of a public place of a contemporary Saharan city

Hanafi, Abdelhakim; Alkama, Djamel

doi:10.1016/j.egypro.2017.07.061

Cited by 12 publications

(9 citation statements)

References 8 publications

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“…Hanafi and Alkama [85] investigated the role of vegetation in outdoor environments in the warm and dry climate of Biskra, Algeria. They observed that Ficus trees (as a group of large crowns) were the most suitable.…”

Section: Tree Morphologymentioning

confidence: 99%

Heat-Mitigation Strategies to Improve Pedestrian Thermal Comfort in Urban Environments: A Review

et al. 2020

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Thermal comfort is one of the main factors affecting pedestrian health, and improving thermal comfort enhances walkability. In this paper, the impact of various strategies on thermal-comfort improvement for pedestrians is thoroughly evaluated and compared. Review studies cover both fieldwork and simulation results. These strategies consist of shading (trees, buildings), the orientation and geometry of urban forms, vegetation, solar-reflective materials, and water bodies, which were investigated as the most effective ways to improve outdoor thermal comfort. Results showed that the most important climatic factors affecting outdoor thermal comfort are mean radiant temperature, wind speed, and wind direction in a microclimate. The best heat-mitigation strategy for improving thermal comfort was found to be vegetation and specifically trees because of their shading effect. The effect of height-to-width (H/W) ratio in canyons is another important factor. By increasing H/W ratio, the thermal-comfort level also increases. Deploying highly reflective materials in urban canyons is not recommended, as several studies showed that they could reflect solar radiation onto pedestrians. Results also showed that, in order to achieve a satisfactory level of thermal comfort, physiological and psychological factors should be considered together.

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Section: Tree Morphologymentioning

confidence: 99%

Heat-Mitigation Strategies to Improve Pedestrian Thermal Comfort in Urban Environments: A Review

et al. 2020

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“…The maximum Predict Mean Vote (PMV) level was decreased from 7.9 to 4.8 and the average radiant temperature also, from 52.9°C to 42.9°C. Hanafi and Alkama [2] highlighted the role of urban plant in improving thermal comfort, energy savings and generating ambience [3]. Matallah et al, [4] assessed thermal comfort in the heart of Tolga Palm Grove and in different urban settlements and tested the validity of the "oasis effect" concept using Physiological Equivalent Temperature (PET) index.…”

Section: Introductionmentioning

confidence: 99%

“…Trees and the shade have a major impact on comfort and usage [25]. They contribute to the improvement of the microclimate in urban areas and significantly reduce user discomfort by providing better conditions [1,2,5,26]. A recent study related to the influence of green spaces on human behaviour; not only in terms of quantity of greenery but also in terms of the configuration [27].…”

Section: Introductionmentioning

confidence: 99%

Predictive Capacity Analysis for Outdoor Thermal Comfort Assessments: A Case Study of Jijel City, Algeria

BOUTELLIS

Bouchair

2022

ARFMTS

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Ensuring acceptable thermal comfort conditions in public spaces is nowadays a major concern of urban design. A number of indices have been proposed in the literature, namely PMV, PET, SET*, UTCI, PT, mPET and MOCI. The present study aims to find the most suitable index the outdoor thermal comfort assessment in the city of Jijel by comparing the predictive capacities of these indices in terms of frequency occurrence and by relating them with the contextual responses of users. These indices are defined, their feature is analysed and finally explored. Thermal comfort based on these indices was evaluated using RayMan and Townscope softwares. The choice among these indices needs their comparison with data gathered from a survey by questionnaire. The findings indicate a slight agreement between these indices and the perceived sensation (PESV) values in the range of -1 and +1, especially with the indices SET* and mPET. However, for the classes +2 and +4, a significant disagreement is observed. For the class +3, however, only PET, PMV and SET* are more joined to the perceived sensation values. The disagreements may be related to the physical environment characteristics, the subjective perception, and the adaptation attitude of the users. Thus, further indices calibration investigation is needed for better prediction of comfort taking into account local specificities. Based on the indices which are relatively in agreement with PESV, a neutral air temperature of 19.8 °C in winter and 20.4 °C in summer for the city of Jijel is deduced. Also, a comfort zone of 17.3 to 22.4 °C in winter and 18 to 22.8 °C in summer is extrapolated.

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“…Musco 2016), or tropical climates of Asia as exemplified by Singapore, Hong Kong, and other Chinese cities (Wong and Chen 2016). Despite the fact that UHI effects are more pronounced in the hot arid belt's summer season than elsewhere, just a few studies on urban greening in this belt have been conducted: Bencheikh and Rchid (2012) studied the Ghardaia Oasis in Algeria; Hanafi and Djamel (2017) GCMA is the largest world metro belonging to the hot arid belt. With more than 25 million inhabitants and about 450 km 2 of built-up area (estimates for the year 2020), the agglomeration witnessed unprecedented expansion during the last decades, overwhelming all the master plans developed before.…”

Section: Introductionmentioning

confidence: 99%

Mitigation strategies of the urban heat island over Greater Cairo Metropolitan Area, Egypt utilizing ENVI-met model

Ibrahim

2021

Catrina: The International Journal of Environmental Sciences

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The formation of urban heat islands (UHI) over cities is the main challenge to the urban environmental sustainability worldwide. To mitigate UHI effects, passive cooling using cool materials and/or greening is thought to be the most effective strategy. As urban greening is relatively nascent in the urban literature, a multitude of research gaps are still to be filled, especially for the cities belonging to the hot arid belt. The present study aims to explore to what extent are three greening strategies (façade greening, roofs greening and urban parks) feasible in UHI mitigation using case study in Greater Cairo Metropolitan Area (GCMA). This task is best achieved through modeling, using the micro-scale numerical model ENVI-met, to simulate the probable outdoor cooling effects of greening for a hot summer day. The results, for this specific case, show that both façade and roof greening would yield up to 0.5 o C average reduction of air temperature compared with the actual case, while the cooling effects of the hypothetical pocket parks may be as high as 7 o C during day time till 15.00 PM, and after that parks would exhibit heat island properties. The study findings may assist in better planning of urban green spaces to increase their cooling potentialities.

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Role of the urban vegetal in improving the thermal comfort of a public place of a contemporary Saharan city

Cited by 12 publications

References 8 publications

Heat-Mitigation Strategies to Improve Pedestrian Thermal Comfort in Urban Environments: A Review

Heat-Mitigation Strategies to Improve Pedestrian Thermal Comfort in Urban Environments: A Review

Predictive Capacity Analysis for Outdoor Thermal Comfort Assessments: A Case Study of Jijel City, Algeria

Mitigation strategies of the urban heat island over Greater Cairo Metropolitan Area, Egypt utilizing ENVI-met model

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