scholarly journals Absolute moisture content in mid-latitude urban canopy layer

2018 ◽  
Vol 51-52 (1) ◽  
pp. 47-56 ◽  
Author(s):  
János Unger ◽  
Nóra Skarbit ◽  
Tamás Gál
Keyword(s):  
Urban Canopy ◽  
Absolute Humidity ◽  
Canopy Layer ◽  
Urban Network ◽  
Local Climate ◽  
Urban Canopy Layer ◽  
The North ◽  
Comprehensive Picture ◽  
Urban Rural ◽  
Local Climate Zone

This study gives a comprehensive picture on the air humidity observation and mapping in urban canopy layer in Szeged, Hungary, analyzing three-year long vapor pressure dataset (e) calculated from observations of a 22-station urban network. The analysis was divided into two directions, namely the urban-rural and intra-urban ones where the latter was partly based on the local climate zone approach. (i) The general features of the annual and diurnal variations of urban-rural absolute humidity difference in cities with mid-latitude climates are also detectable in the case of Szeged. (ii) In the annual and seasonal e means there is no clear zone sequence that would follow the differences in the compactness or building height of the zones and even the built-up versus land cover distinction. (iii) The highest e values and their differences among stations appear in summer, while the lowest ones in winter and the values of transitional seasons are between them. In certain cases the intra-zone differences can exceed the inter-zone ones since the effect of microscale environment is essential. The decisive factors are the permeability of the surface and the vegetation cover. (iv) The diurnal course of the e pattern in normalized 4-hour time steps does not show a regular shape, the patterns are mosaic-like: in all time steps the driest and wettest areas are mainly in the north-western and south-eastern parts, respectively.

scholarly journals Absolute moisture content in mid-latitude urban canopy layer

2018 ◽  
Vol 51-52 (1) ◽  
pp. 37-45 ◽  
Author(s):  
János Unger ◽  
Nóra Skarbit ◽  
Tamás Gál
Keyword(s):  
Spatial Distribution ◽  
Moisture Content ◽  
Case Studies ◽  
Urban Canopy ◽  
Absolute Humidity ◽  
Temperature Dependent ◽  
Canopy Layer ◽  
Urban Canopy Layer ◽  
Absolute Measure ◽  
Urban Rural

This part of the study on absolute moisture content in the mid-latitude urban canopy layer first gives a comparison on intra-urban relative and absolute humidity patterns showing an example based on a long dataset. The comparison clearly demonstrates the usefulness of the utilization of absolute measure opposite to the temperature dependent relative one. This supports the earlier statements found in the literature albeit these statements are based on only case studies or short datasets. Then a short overview follows which presents the main results of studies about urban absolute moisture content. These studies focused mainly on urban-rural and less on intra-urban humidity differences. The scale differences are used for the grouping of studies based on the number of available measurement sites as well as their spatial distribution and density in the investigated urban regions.

scholarly journals Morphological analysis: to evaluate the pattern of Residential building based on wind performance

2017 ◽  
Author(s):  
Wowo Ding ◽  
Yihui Yang ◽  
Wei You ◽  
Yunlong Peng
Keyword(s):  
Residential Buildings ◽  
Urban Canopy ◽  
Residential Building ◽  
Urban Morphology ◽  
High Density ◽  
Canopy Layer ◽  
Wind Environment ◽  
Local Climate ◽  
Improve Design ◽  
Morphological Patterns

Yihui Yang, Wei You, Yunlong Peng, Wowo Ding*, School of Architecture and Urban Planning, Nanjing University, No.22 Hankou Rd, Jiangsu 210093, P.R.China. E-mail:[email protected], [email protected], [email protected], [email protected],Phone number:15850561165, 13852293251, +86 25 83593020, Keyword: Residential plot, Apartment pattern, performance evaluation, wind environment Conference topics and scale: Tools of analysis in urban morphology     Residential morphological patterns are reflection of people's living habits and tradition, local climate and building regulations, so that one of those factors could be studied through in order to understand residential morphological patterns. Based upon our previous study, we do know that in China living habits and local climate mainly influence the shape of residential buildings and apartment patterns, but we do not know whether the pattern of residential plots determined by FAR and sunshine hours are suitable for wind environment related to residential environmental quality. Therefore, it is very significant to evaluate wind environment within residential plots based on the apartment pattern controlled by various building codes. Our study focuses on the pattern of Slab apartments in Nanjing, which are mainly used in China, and selects 40 residential slices with different plot shapes, plot FAR, building heights and sizes. Based upon MATLAB, we have got all geometrical data between buildings among these slices to identify the spatial pattern character of each residential plot. Through evaluating wind environment of these slices by simulation we can obtain wind speed, pressure and age of air and choose the pattern of age of air as the main evaluation factor of wind performance. Correlation analysis will be made between the apartment patterns and pattern of age of air, by doing so, each typical space between buildings will be evaluated. Our study will reveal the relevance of apartment pattern and wind environment, which can be used to support and improve design in the future.   References（95 words） Oke. T. R (1988) ‘Street Design and Urban Canopy Layer Climate’, Energy and Buildings11, 103-113. Wowo Ding, Youpei Hu, Pingping Dou (2012) ‘Study on Interrelationship between Urban Pattern and Urban Microclimate’, Architectural Journal 527, 16-21. Edward Ng, Chao Yuan, Liang Chen, Chao Ren, Jimmy C.H. Fung (2011) ‘Improving the wind environment in high-density cities by understanding urban morphology and surface roughness: A study in Hong Kong’, Landscape and Urban Planning101, 59-74. Youpei Hu (2014) ‘A Performance-Oriented Study on the Morphological Optimization in a High Density Area Concerning Urban Heat Island Effect’, Architectural Journal 557, 23-29.           *corresponding author

scholarly journals Observations of Air Temperature in the Urban Canopy Layer in Nagahama-city

1998 ◽  
Vol 26 ◽  
pp. 487-492
Author(s):  
Hirohito KIRIHARA ◽  
Takeshi FUJINO ◽  
Takehiko MIKAMI
Keyword(s):  
Air Temperature ◽  
Urban Canopy ◽  
Canopy Layer ◽  
Urban Canopy Layer
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