A field research on the impact of underlying surface configuration on street thermal environment in Lhasa

Lin Ma; Jun Zhang; Lixing Chen; Shuling Xiao; Yingzi Zhang; Lin Ma; Jun Zhang; Lixing Chen; Shuling Xiao; Yingzi Zhang

doi:10.3934/environsci.2019.6.483

AIMS Environmental Science

2019, Volume 6, Issue 6: 483-503. doi: 10.3934/environsci.2019.6.483

Previous Article Next Article

Research article Special Issues

A field research on the impact of underlying surface configuration on street thermal environment in Lhasa

1.
Architecture and design, Southwest Jiaotong University, China
2.
Beijing urban construction design and development group co. limited

Received: 30 September 2019 Accepted: 27 November 2019 Published: 24 December 2019

Commercial street is an important place for outdoor activities of urban residents. The quality of its thermal environment directly affects the comfort of pedestrians and the energy consumption of surrounding buildings. Block-scale microclimate studies have already been conducted in the context of different climates, while limited attention has been paid to the microclimate within high-altitude cold climate. Tibet, as the main body of the Qinghai-Tibet Plateau, presents typical plateau climate characteristics, and its unique natural climate conditions will certainly give birth to special urban environmental problems. Therefore, taking Lhasa as an example, this paper focuses on the impact of street thermal environment under different underlying surface configurations under unique plateau climate conditions. Based on the field measurement of the thermal environment of three streets in Lhasa City, namely, Yutuo Road, Duosen Road and Hongqi Road, the influence of different underlying surface design elements, namely, greening and water area, on the near ground microclimate and pedestrian comfort of the streets were analyzed. The analysis results of the measured datas show that: there are obvious temperature differences in the streets of different directions. Trees have a more significant cooling effect on East-West streets. The leaf area index (LAI) of trees will affect the improvement of thermal environment. Fountain has cooling effect in summer, but it is lower than that of trees. The research contents of this paper provides data basis for further research on the thermal environment and the optimization design of the underlying surface of the streets in the high altitude cold climate area.
- underlying surface properties,
- street thermal environment,
- greening,
- fountain body,
- field measurement
Citation: Lin Ma, Jun Zhang, Lixing Chen, Shuling Xiao, Yingzi Zhang. A field research on the impact of underlying surface configuration on street thermal environment in Lhasa[J]. AIMS Environmental Science, 2019, 6(6): 483-503. doi: 10.3934/environsci.2019.6.483

Related Papers:

Abstract

Commercial street is an important place for outdoor activities of urban residents. The quality of its thermal environment directly affects the comfort of pedestrians and the energy consumption of surrounding buildings. Block-scale microclimate studies have already been conducted in the context of different climates, while limited attention has been paid to the microclimate within high-altitude cold climate. Tibet, as the main body of the Qinghai-Tibet Plateau, presents typical plateau climate characteristics, and its unique natural climate conditions will certainly give birth to special urban environmental problems. Therefore, taking Lhasa as an example, this paper focuses on the impact of street thermal environment under different underlying surface configurations under unique plateau climate conditions. Based on the field measurement of the thermal environment of three streets in Lhasa City, namely, Yutuo Road, Duosen Road and Hongqi Road, the influence of different underlying surface design elements, namely, greening and water area, on the near ground microclimate and pedestrian comfort of the streets were analyzed. The analysis results of the measured datas show that: there are obvious temperature differences in the streets of different directions. Trees have a more significant cooling effect on East-West streets. The leaf area index (LAI) of trees will affect the improvement of thermal environment. Fountain has cooling effect in summer, but it is lower than that of trees. The research contents of this paper provides data basis for further research on the thermal environment and the optimization design of the underlying surface of the streets in the high altitude cold climate area.

References

[1]	Shashua-Bar L, Hoffman ME (2002) The green cttc model for predicting the air temperature in small urban wooded sites. Build Environ 37: 1279-1288. doi: 10.1016/S0360-1323(01)00120-2
[2]	Andrew M, EC White, NJ Tapper, et al. (2016) Temperature and human thermal comfort effects of street trees across three contrasting street canyon environments. Thero Appl Climatol 124: 55-68. doi: 10.1007/s00704-015-1409-y
[3]	Ali-Toudert F, Mayer H (2005) Thermal comfort in urban streets with trees under hot summer conditions[C]. International Conference on Passive and Low Energy Architecture. 2005: 699-704.
[4]	Morakinyo TE, Kong L, Lau KL, et al. (2017) A study on the impact of shadow-cast and tree species on in-canyon and neighborhood's thermal comfort. Build Environ 115: 1-17. doi: 10.1016/j.buildenv.2017.01.005
[5]	Oke TR (1989) The micrometeorology of the urban forest. Philos Tr R Soc S-A 324: 335-349. doi: 10.1098/rstb.1989.0051
[6]	Stella T, Katerina T, Theodoros T (2017) Urban space's morphology and microclimatic analysis: A study for a typical urban district in the Mediterranean city of Thessaloniki, Greece. Energy Build 156: 96-108. doi: 10.1016/j.enbuild.2017.09.066
[7]	Kubota T, Miura M, Tominaga Y, et al. (2008) Wind tunnel tests on the relationship between building density and pedestrian-level wind velocity: Development of guidelines for realizing acceptable wind environment in residential neighborhoods. Build Environ 43: 1699-1708. doi: 10.1016/j.buildenv.2007.10.015
[8]	Jingyuan Z, Jiaping L (2009) Dynamic thermal effect of urban street Valley greening. J Solar Energy 30: 1013-1017.
[9]	Zhen W (2008) Study on the Design Strategy of Climate Adaptability of Street Canyon of Hot-summer and Cold-winter Zones Based on Urban Microclimate[D]. Huazhong University and Science and Technology.
[10]	Haiping L, Dexuan S (2018) Study on the impact of greening types on the thermal environment of high-density urban residential areas. Archit Sci 34: 66-73.
[11]	María AR, Correa EN (2015) Adaptive model for outdoor thermal comfort assessment in an Oasis city of arid climate. Build Environ 85:40-51. doi: 10.1016/j.buildenv.2014.11.018
[12]	Yingsheng Z, Yuan S, Chao R, et al. (2016) Study on the optimization strategy of urban form to improve the ventilation of high-density urban areas: a case study of Tai Po market, New Territories, Hong Kong. Inter Urban plan 31: 68-75.
[13]	Xinrong Z, Liu Y, Jiaping L, et al. (2008) Correction coefficient of heat transfer coefficient of urban envelope in Tibet Autonomous Region. J Tsinghua University (NATURAL SCIENCE EDITION): 1381-1384.
[14]	Feng Y, Chen B (2004) Utilization of natural heating energy in Tibet Plateau [C]. National Academic Conference on architectural physics.
[15]	Quan H (2009) Study on architectural culture of Tibetan dwellings [D]. Xi'an University of architecture and technology.
[16]	Songtao H, Yuezhi X, Guodan L, et al. (2009) Study on human thermal comfort under low-pressure environment based on orthogonal test method. HVAC 39: 18-21.
[17]	SB M, ME W (1998) Evaluating environmental consequences of producing herbaceous crops for bioenergy. Biomass Bioenergy 14:317-324. doi: 10.1016/S0961-9534(97)10066-6
[18]	Oke TR (1992) Boundary Layer Climates[M]. Psychology Press.
[19]	Skelhorn C, Lindley S, Levermore G (2014) The impact of vegetation types on airand surface temperatures in a temperate city: a fine scale assessment in Manchester, UK. Landscape Urban Plan 121: 129-140. doi: 10.1016/j.landurbplan.2013.09.012
[20]	Bruse M, Fleer H (1998) Simulating surface-plant-air interactions inside urban environments with a three dimensional numerical model. Environ Model Softw 13: 373-384. doi: 10.1016/S1364-8152(98)00042-5
[21]	Kántor N, Unger J (2011) The most problematic variable in the course of human-biometeorological comfort assessment- the mean radiant temperature. Cent Eur J Geosci 3: 90-100
[22]	Matzarakis A, Mayer H (1996) Another kind of environmentalstress: thermal stress. WHO Collaborating Centre for Air Quality Management and Air Pollution Control. WHO Newsletters 18: 7-10.

Reader Comments

Your name:*

Email:*
© 2019 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0)