scholarly journals Temporal Effects of Environmental Characteristics on Urban Air Temperature: The Influence of the Sky View Factor

2016 ◽  
Vol 8 (9) ◽  
pp. 895 ◽  
Author(s):  
Jaehyun Ha ◽  
Sugie Lee ◽  
Cheolyeong Park
Keyword(s):  
Air Temperature ◽  
Urban Air ◽  
View Factor ◽  
Environmental Characteristics ◽  
Temporal Effects ◽  
Sky View Factor

scholarly journals Optimization Strategy of Traditional Block Form Based on Field Investigation—A Case Study of Xi’an Baxian’an, China

2021 ◽  
Vol 18 (20) ◽  
pp. 10895
Author(s):  
Wei Feng ◽  
Wei Ding ◽  
Yingdi Yin ◽  
Qixian Lin ◽  
Meng Zheng ◽  
...  
Keyword(s):  
Wind Speed ◽  
Air Temperature ◽  
Speed Ratio ◽  
View Factor ◽  
Rapid Urbanization ◽  
Architectural Form ◽  
Building Density ◽  
Building Height ◽  
Sky View Factor

Rapid urbanization has caused environmental problems such as the urban heat island and air pollution, which are unfavorable to residents. Urban traditional blocks are facing the dual challenges of restoration and protection. This paper proposes adaptive transformation strategies for improving the microclimate of traditional areas. We selected Baxian’an Block in Xi’an city, simulated the air temperature and wind speed during summer and winter using ENVI-met, and studied the correlationship between morphological parameters (average building height, building density, enclosure degree, height fall, aspect ratio, and sky view factor) and air temperature and wind speed ratio. The case study revealed that the wind speed ratio of Baxian’an is relatively different in summer, reaching a maximum of 0.61, meaning that the ventilation capacity is significantly affected by the architectural form of the block. Finally, suggestions for the optimal design of the block’s form are provided: the building density should be less than 50%, the average building height should be more than 50 m, the enclosure degree should be less than 0.2, the height fall should be more than 41.7 m, and the sky view factor should be less than 0.5. This study can provide data and support for improving the planning and design standards of traditional residential areas.

scholarly journals The Effect of Sky View Factor on Air temperature in High-rise Urban Residential Environments

2019 ◽  
Vol 6 (2) ◽  
pp. 42-51
Author(s):  
Golnar Baghaeipoor ◽  
◽  
Nazanin Nasrollahi ◽  
Keyword(s):  
Air Temperature ◽  
View Factor ◽  
High Rise ◽  
Sky View Factor ◽  
Residential Environments

scholarly journals Sky view factor and thermal comfort analysis using hemispheric images from Google Street View and wavelet in an urban ecosystem of the Brazilian Cerrado

2018 ◽  
Vol 40 ◽  
pp. 26
Author(s):  
Angela Fatima da Rocha ◽  
Ernany Paranaguá da Silva ◽  
Carlo Ralph de Musis ◽  
Marta Cristina de Albuquerque Nogueira
Keyword(s):  
Thermal Comfort ◽  
Air Temperature ◽  
View Factor ◽  
Brazilian Cerrado ◽  
Physiological Equivalent Temperature ◽  
Mato Grosso ◽  
Google Street View ◽  
Sky View Factor ◽  
Street View ◽  
Temperature And Humidity

This article aims to analyse the sky view factor (SVF) in one of the hottest cities of the Brazilian Cerrado, and its correlation with thermal comfort in two urban sections with different characteristics, as well as the physiological equivalent temperature (PET) and predicted mean vote (PMV) indices, complemented by a characterisation in the frequency field for a 12-month cut-off in the same year of relative air temperature and humidity. The study area was located in the central region of Cuiabá, Mato Grosso, due to the presence of regions with high urbanisation indices and small parks; one section composed of afforested area and second section composed of varied buildings. To obtain the SVF, the Google Street View image database was used, from which fisheye images were reconstructed and the SVF was determined using  RayMan  software. The PET and PMV indices were determined for the morning, afternoon, and evening, with comfort in the morning and discomfort in the afternoon and evening. Traditional Morlet wavelets were plotted for time series of relative air temperature and humidity for the year 2015, which qualitatively demonstrated some of the dynamics of these micrometeorological variables for tropical Cerrado climate.

Positional error modeling of sky‐view factor measurements within urban street canyons

2021 ◽  
Author(s):  
Zian Wang ◽  
Guoan Tang ◽  
Guonian Lü ◽  
Cheng Ye ◽  
Fangzhuo Zhou ◽  
...  
Keyword(s):  
Error Modeling ◽  
View Factor ◽  
Positional Error ◽  
Street Canyons ◽  
Urban Street ◽  
Sky View Factor ◽  
Urban Street Canyons

scholarly journals Quantifying the Independent Influences of Land Cover and Humidity on Microscale Urban Air Temperature Variation in Hot Summer: Methods of Path Analysis and Genetic SVR

Atmosphere ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1377
Author(s):  
Weifang Shi ◽  
Nan Wang ◽  
Aixuan Xin ◽  
Linglan Liu ◽  
Jiaqi Hou ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Land Cover ◽  
Path Analysis ◽  
Temperature Variation ◽  
Direct Effect ◽  
Air Temperature ◽  
Urban Areas ◽  
Support Vector ◽  
Urban Air ◽  
Air Temperatures

Mitigating high air temperatures and heat waves is vital for decreasing air pollution and protecting public health. To improve understanding of microscale urban air temperature variation, this paper performed measurements of air temperature and relative humidity in a field of Wuhan City in the afternoon of hot summer days, and used path analysis and genetic support vector regression (SVR) to quantify the independent influences of land cover and humidity on air temperature variation. The path analysis shows that most effect of the land cover is mediated through relative humidity difference, more than four times as much as the direct effect, and that the direct effect of relative humidity difference is nearly six times that of land cover, even larger than the total effect of the land cover. The SVR simulation illustrates that land cover and relative humidity independently contribute 16.3% and 83.7%, on average, to the rise of the air temperature over the land without vegetation in the study site. An alternative strategy of increasing the humidity artificially is proposed to reduce high air temperatures in urban areas. The study would provide scientific support for the regulation of the microclimate and the mitigation of the high air temperature in urban areas.

scholarly journals Calculation of the irradiance of solar radiation in a greenhouse with a complex structure using a diagram for sky view factor

2020 ◽  
Vol 76 (1) ◽  
pp. 44-52
Author(s):  
Shuh MATSUDA ◽  
Hisashi YOSHIKOSHI ◽  
Tomoyo SUZUKI ◽  
Yuuki OHTA ◽  
Ayaka CHIBA ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Complex Structure ◽  
View Factor ◽  
Sky View Factor
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