The simulation of environmental impacts of extensive and intensive green roofs in Yazd city

Document Type : Full Paper

Author

Assistant Professor, Department of Ornamental Plants, Research Center for Plant Sciences, Ferdowsi University of Mashhad, Mashhad, Iran

Abstract

Environmental and microclimate studies of various green roof types in arid areas of Iran should be carefully studied in order to assess their potential effects on the surrounding environment and the citizens, before the development and expansion of them. By the same token, a research was performed in one of the residential areas of the Yazd city by using climate data of 2014. In this study, the software simulation on the research area at the same time and place was done, including: intensive green roof, extensive green roof and roof without vegetation with ENVI-met model. The outputs of this model indicated that the effects of temperature, relative humidity and thermal comfort index in the simulated green roofs have been negligible and inconsiderable in comparison with the roof without vegetation in the hot period of the year. Also the three simulated sites were in the extreme heat tension range.

Keywords


  1. Alexandri, E. & Jones, P. (2008). Temperature decreases in an urban canyon due to green walls and green roofs in diverse climates. Building and Environment, 43(4), 480-93.
  2. Ali-Toudert, F. (2005). Dependence of outdoor thermal comfort on street design in hot and dry climate, PhD thesis, University of Freiburg, Germany.
  3. Asimakopoulos, D.A., Santamouris, M., Farrou, I., Laskari, M., Saliari, M., Zanis, G., Giannakidis, G., Tigas, K., Kapsomenakis, J., Douvis, C., Zerefos, S.C., ntonakaki, T. & Giannakopoulos, C. (2012). Modelling the energy demand projection of the building sector in Greece in the 21st century. Energy and Buildings, 49, 488-498.
  4. Azarakhshi, M., Farzadmehr, J., Eslah, M. & Sahabi, H. (2013). An Investigation on Trends of Annual and Seasonal Rainfall and Temperature in Different Climatologically Regions of Iran. Journal of Range and Watershed Management, 66 (1), 1-16. (in Farsi)
  5. Bauerle, W.L., Bowden, J.D. Geoff Wang, G. & Shahba, M.A. (2009). Exploring the importance of within-canopy spatial temperature variation on transpiration predictions. Journal of Experimental Botany, 60, 3665-3676.
  6. Bass, B. & Baskaran, B. (2003). Evaluating rooftop and vertical gardens as an adaptation strategy for urban areas. Institute for Research and Construction, National Research Council, Canada, Ottawa, p. 111.
  7. Berndtsson, J. C. (2010). Green roof performance towards management of runoff water quantity and quality: a review. Ecological Engneering, 36, 351-360.
  8. Boixo, S., Diaz-Vicente, M., Colmenar, A. & Castro, M. A. (2012). Potential energy savings from cool roofs in Spain and Andalusia. Energy, 38(1), 425-438.
  9. Bozonnet, E., Doya, M. & Allard, F. (2011). Cool roofs impact on building thermal response: a French case study. Energy and Buildings, 43(11), 3006-3012.
  10. Brenneisen, S. (2006). Space for urban wildlife: designing green roofs as habitats in Switzerland. Urban Habitats, 4, 27-36.
  11. Brown, R. D. & Gillespie, T. J. (1995). Microclimate landscape design: creating thermal comfort and energy efficiency, John Wiley and Sons, New York.
  12. Bruse, M. ENVI-met website. Retrieved in: http://www.envi-met.com. Visited: 2015/03/01.
  13. Johansson, E. (2006). Urban Design and Outdoor Thermal Comfort in Warm Climates. Studies in Fez and Colombo. Ph.D. thesis. Housing Development & Management, Lund University.
  14. Hunter Block, A., Livesley, S. J. & Williams, N. S. J. (2012). Responding to the Urban Heat Island: A Review of the Potential of Green Infrastructure. Literature Review, University of Melbourne, www.vcccar.org.au.
  15. Klett, J., Bousselot, J. & Koski, R. (2012). Evaluation of Green Roof Plants and Materials for Semi-Arid Climates, EPA-National Center for Environmental Publications. EPA/600/R-12-592. 78 pages.
  16. Kolokotsa, D., Santamouris, M. & Zerefos, S.C. (2013). Green and cool roofs’ urban heat island mitigation potential in European climates for office buildings under free floating conditions. Solar Energy, 95, 118-130.
  17. Li, W. C. & Yeung, K. K. A. (2014). A Comprehensive Study of Green Roof Performance from Environmental Perspective. International Journal of Sustainable Built Environment, 3(1), 127-134.
  18. McPherson, E. G. (1994). Energy-saving potential of trees in Chicago. Chicago's urban forest ecosystem: Results of the Chicago urban forest climate project. USDA forest service, General Technical Report NE, 186, 95-113.
  19. Oke, T. R. (1982). The energetic basis of the urban heat island. Journal of Royal Meteorological Society, 108, 1-24.
  20. Pearlmutter, D., Kruger, E. L. & Berliner, P. (2009). The role of evaporation in the energy balance of an open-air scaled urban surface. International Journal of Climatology, 29, 911-20.
  21. Potcher, O., Cohen, P. & Bitan, A. (2006). Climatic behaviour of various urban parks during hot and humid summer Mediterranean city of Tel Aviv, Israel. International Journal of Climatology, 26, 1695- 711.
  22. Razzaghmanesh, M., Beecham, S. & Kazemi, F. (2014). The growth and survival of plants in urban green roofs in a dry climate. Science of the Total Environment, 476-477, 288-297.
  23. Rosenzweig, C., Solecki, W., Parshall, L., Gaffin, S., Lynn, B., Goldberg, R., Cox, J. & Hodges, S. (2006). Mitigating New York City’s heat island with urban forestry, living roofs, and light surfaces. a report to the New York State Energy Research and Development Authority, viewed 3 March 2012: <http://www.mendeley.com/research/mitigating-new-york-citys-heat-island-with-urban-forestry-living-roofs.
  24. Santamouris, M., Gaitani, N., Spanou, A., Saliari, M., Giannopoulou, K., Vasilakopoulou, K. & Kardomateas, T. (2012). Using cool paving materials to improve microclimate of urban areas–Design realization and results of the flisvos project. Building and Environment, 53, 128-136.
  25. Shahidan, M. F., Shariff, M. K. M., Jones, P., Salleh, E. & Abdullah, A. M. (2010). A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort. Landscape and Urban Planning, 97(3), 168-81.
  26. Shashua-Bar, L., Pearlmutter, D. & Erell, E. (2011). The influence of trees and grass on outdoor thermal comfort in a hot-arid environment. International Journal of Climatology, 31(10), 1498-506.
  27. Spangenberg, J., Shinzato, P., Johansson, E. & Duarte, D. (2008). Simulation of the influence of vegetation on microclimate and thermal comfort in the city of São Paulo. Rev SBAU Piracicaba, 3(2), 1-19.
  28. Specht, R. L. & Specht, A. (2002). Australian plant communities: dynamics of structure, growth and biodiversity. Oxford University Press, South Melbourne.
  29. Taha, H. (1997). Urban climates and heat islands: albedo, evapotranspiration, and anthropogenic heat. Energy and Buildings, 25, 99-103.
  30. Tengfang, X., Sathaye, J., Akbari, H., Gargc, V. & Tetali, S. (2012). Quantifying the direct benefits of cool roofs in an urban setting: reduced cooling energy use and lowered greenhouse gas emissions. Building and Environment, 48, 1-6.Van Renterghem, T. & Botteldooren, D. (2009). Reducing the acoustical facade load from road traffic with green roofs. Building and Environment, 44, 1081-1087.
  31. Vijayaraghavan, K., Joshi, U. M. & Balasubramanian, R. (2012). A field study to evaluate runoff quality from green roofs. Water Resource, 46, 1337-45.
  32. Voogt, J.A. (2002). Urban heat island, in I Douglas (ed.), Encyclopedia of global environmental change, John Wiley and Sons, New York, pp. 660-6.
  33. Will, R. E., Wilson, S. M., Zou, C. B. & Hennessey, T. C. (2013). Increased vapor pressure deficit due to higher temperature leads to greater transpiration and faster mortality during drought for tree seedlings common to the forest–grassland ecotone.  Journal of Experimental Botany, 60(13), 3665-3676.
  34. Williams, N., Hughes, R., Jones, N., Bradbury, D. & Rayner, J. (2010a). The performance of native and exotic species for extensive green roofs in Melbourne, Australia. Acta Horticulture, 881, 689-696.
  35. Williams, N. S. G., Rayner, J. P. & Raynor, K. J. (2010b). Green roofs for a wide brown land: opportunities and barriers for rooftop greening in Australia. Urban Forest, Urban Greening, 9, 245-251.