Air Temperature Distribution and the Influence of Sky View Factor in a Green Singapore Estate
Publication: Journal of Urban Planning and Development
Volume 136, Issue 3
Abstract
This paper investigates, first, the influence of vegetations to the air temperature distribution and, second, the correlation between air temperature and sky view factor (SVF) to understand whether the trees have adverse impact especially to the nighttime air temperature since trees reduce the SVF values. Air temperature and SVF measurements were conducted in a green Singapore estate, One-North, from November 1, 2007 to March 31, 2008. The field measurement results show that daytime air temperature difference between dense greenery area and less greenery area is 2.4 K and the nighttime air temperature difference is 1.1 K. The temperature maps study provides a clear picture on the air temperature distribution across the One-North estate and concludes that parks or clusters of trees are able to maintain both daytime and nighttime air temperature at a cool level. Statistical analysis was conducted to analyze the correlation between air temperature and SVF. During daytime, there is a significant and good correlation between air temperature and SVF. The higher the SVF, the higher is the air temperature. Trees reduce the sky openness and provide shading to the environment. At nighttime, there is a weak correlation between air temperature and SVF. Thus, there is no adverse impact, i.e., reduction of nighttime net long-wave loss, due to the reduction of SVF by trees.
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References
Akbari, H., et al. (1992). Cooling our communities—A guidebook on tree planting and light colored surfacing, U.S. Environmental Protection Agency, Office of Policy Analysis, Climate Change Division.
Bärring, I., Mattsson, J. O., and Lindqvist, S. (1985). “Canyon geometry, street temperatures and urban heat island in Malmö, Sweden.” J. Climatol., 5, 433–444.
Blennow, K. (1995). “Sky view factors from high resolution scanned fish-eye lens photograghic negatives.” J. Atmos. Ocean. Technol., 12, 1357–1362.
Bosselmann, P., Dunker, P. K., and Wright, R. M. (1995). “Urban form and climate: Toronto case study.” J. Am. Plan. Assn., 61(2), 226–239.
Chapman, L., Thornes, J. E., and Bradley, A. V. (2001). “Rapid determination of canyon geometry parameters for use in surface radiation budgets.” Theor. Appl. Climatol., 69, 81–89.
Chen, Y., and Wong, N. H. (2006). “Thermal benefits of city parks.” Energy Build., 38, 105–120.
Cheong, K. H. (2008). “Strategies for sustainable urban development in Singapore.” Speech in forum on sustainable urbanization in the information age at the United Nations headquarters, ⟨http://www.ura.gov.sg/pr/text/2008/pr08-42.html⟩ (July 8, 2008).
Dale, O. J. (2008). “Sustainable city center development: The Singapore City center in the context of sustainable development.” Spatial planning for a sustainable Singapore, T. Wong, et al., eds. Springer, London.
Eliasson, I. (1990). “Urban geometry, surface temperature and air temperature.” Energy Build., 15, 141–145.
Eliasson, I. (1996). “Urban nocturnal temperatures, street geometry and land use.” Atmos. Environ., 30(3), 379–392.
Giridharan, R., et al. (2007). “Urban design factors influencing heat island intensity in high-rise high density environments of Hong Kong.” Build. Environ., 42, 3669–3684.
Goldblum, C. (2008). “Planning the world metropolis on an island-city scale: Urban innovation as a constraint and tool for global change.” Spatial planning for a sustainable Singapore, T. Wong, et al., eds. Springer, London.
Gómez, F., Jabaloyes, J., and Vañó, E. (2004). “Green zones in the future of urban planning.” J. Urban Plann. Dev., 130, 94–100.
Johansson, E., and Emmanuel, R. (2006). “The influence of urban design on outdoor thermal comfort in the hot, humid city of Colombo, Sri Lanka.” Int. J. Biometeorol, 51, 119–133.
Kottmeier, C., Beigert, C., and Corsmeier, U. (2007). “Effects of urban land use on surface temperature in Berlin: Case study.” J. Urban Plann. Dev., 133, 128–137.
Lansberg, H. E. (1981). The urban climate, Academic Press, London.
Lowry, W. P. (1988). Atmospheric ecology for designers and planners, Peavine, McMinnile, Ore.
Matzarakis, A., Rutz, F., and Mayer, H. (2000). “Estimation and calculation of the mean radiant temperature within urban structures.” Selected Papers from Conf. ICB-ICUC’99, 273–278.
Oke, T. R. (1981). “Canyon geometry and the nocturnal urban heat island: Comparison of scale model and field observations.” J. Climatol., 1(1–4), 237–254.
Oke, T. R. (1982). “The energetic basis of urban heat island.” Q. J. R. Meteorol. Soc., 108, 1.
Oke, T. R. (1987). Boundary layer climates, 2nd ed., Routledge, London.
Oke, T. R. (1989). “The micrometeorology of the urban forest.” Philos. Trans. R. Soc. London, Ser. B, 324, 335–349.
Oke, T. R., and Eas, C. (1971). “The urban boundary layer in Montreal.” Boundary-Layer Meteorol., 1, 411–437.
Oke, T. R., Johnson, G. T., Steyn, D. G., and Watson, I. D. (1991). “Simulation of surface urban heat islands under ‘ideal’ conditions at night. Part 2: Diagnosis of causation.” Boundary-Layer Meteorol., 56, 339–358.
Padmanabhamurty (1990–1991 ). “Microclimates in tropical urban complexes.” Energy Build., 15, 83–92.
Saito, I., Ishihara, O., and Katayama, T. (1990–1991 ). “Study of green areas on the thermal environment in an urban area.” Energy Build., 15, 493–498.
Sani, S. (1990–1991 ). “Urban climatology in Malaysia: An overview.” Energy Build., 15, 105–117.
Santamouris, M. (2001). “The canyon effect.” Energy and climate in the urban built environment, M. Santamouris, ed., James & James Science Publishers, London.
Shashua-bar, L., and Hoffman, M. E. (2000). “Vegetation as a climatic component in the design of an urban street, an empirical model for predicting the cooling effect of urban green areas with trees.” Energy Build., 31, 221–235.
Shashua-bar, L., and Hoffman, M. E. (2002). “The green CTTC model for predicting the air temperature in small urban wooded sites.” Build. Environ., 37, 1279–1288.
Swaid, H., and Hoffman, M. E. (1990). “Climate impacts of urban design features for high and mid latitude cities.” Energy Build., 14, 325–336.
Takahashi, K., Yoshida, H., Tanaka, Y., Aotake, N., and Wang, F. (2004). “Measurement of thermal environment in Kyoto City and its prediction by CFD simulation.” Energy Build., 36, 771–779.
URA. (2008). ⟨www.ura.gov.sg⟩.
Wong, N. H., and Chen, Y. (2005). “Study of green areas and urban heat island in a tropical city.” Habitat Int., 29, 547–558.
Wong, N. H., and Chen, Y. (2006). “The impact of vegetation on environmental conditions and energy efficiency of industrial facilities.” Research Project Rep., National University of Singapore, Singapore.
Wong, N. H., Chen, Y., Chui, L. O., and Sia, A. (2003). “Investigation of thermal benefits of rooftop garden in the tropical environment.” Build. Environ., 38(2), 261–270.
Wong, N. H., Jusuf, S. K., La Win, A. A., Thu, H. K., Negara, T. S., and Xuchao, W. (2007). “Environmental study of the impact of greenery in an institutional campus in the tropics.” Build. Environ., 42, 2949–2970.
Wong, T., and Goldblum, C. (2008). “Sustainability planning and its theory and practice: An introduction.” Spatial planning for a sustainable Singapore, T. Wong, et al., eds., Springer, London.
Yamashita, S., Sekine, K., Shoda, M., Yamashita, K., and Hara, Y. (1986). “On the relationship between heat island and sky view factor in the cities of Tama River Basin, Japan.” Atmos. Environ., 20(4), 681–686.
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Published In
Journal of Urban Planning and Development
Volume 136 • Issue 3 • September 2010
Pages: 261 - 272
Copyright
© 2010 ASCE.
History
Received: Aug 18, 2008
Accepted: Jun 30, 2009
Published online: Jul 2, 2009
Published in print: Sep 2010
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