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The effect of Temperature Reduction of Green Roof using Rainwater Storage Tank

빗물 저류 시스템을 활용한 옥상 녹화의 온도 저감 효과

  • Yun, Seok-Hwan (Interdisciplinary program in Landscape Architecture and Integrated Major in Smart City Global Convergence Program, Seoul National University) ;
  • Kim, Eun-Sub (Interdisciplinary program in Landscape Architecture and Integrated Major in Smart City Global Convergence Program, Seoul National University) ;
  • Piao, Zheng-Gang (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University) ;
  • Jeon, Yoon-Ho (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University) ;
  • Kang, Hye-Won (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University) ;
  • Kim, Sang-Hyuck (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University) ;
  • Kim, Ji-Yeon (Interdisciplinary program in Landscape Architecture and Integrated Major in Smart City Global Convergence Program, Seoul National University) ;
  • Kang, Han-Min (Korea institute of green infrastructure) ;
  • Ham, Eun-Kyung (Korea institute of green infrastructure) ;
  • Lee, Dong-Kun (Dept. of Landscape Architecture and Rural System Engineering, Seoul National University)
  • 윤석환 (서울대학교 협동과정 조경학 & 스마트시티 글로벌 융합 전공) ;
  • 김은섭 (서울대학교 협동과정 조경학 & 스마트시티 글로벌 융합 전공) ;
  • 박정강 (서울대학교 생태조경.지역시스템공학부) ;
  • 전윤호 (서울대학교 생태조경.지역시스템공학부) ;
  • 강혜원 (서울대학교 생태조경.지역시스템공학부) ;
  • 김상혁 (서울대학교 생태조경.지역시스템공학부) ;
  • 김지연 (서울대학교 협동과정 조경학 & 스마트시티 글로벌 융합 전공) ;
  • 강한민 (한국그린인프라 연구소) ;
  • 함은경 (한국그린인프라 연구소) ;
  • 이동근 (서울대학교 조경지역시스템공학부)
  • Received : 2021.10.15
  • Accepted : 2021.12.23
  • Published : 2021.12.31

Abstract

Thermal environment of city is getting worse due to severe urban heat island caused by climate change and urbanization. Green roof improves the urban thermal environment and save the cooling energy in buildings. This study presented a green roof combined with a storage system that stores rain-water and supplies water through a wick and evaluated the temperature reduction effect as surface temperature and amount of evapotranspiration. For about a week, the surface temperature using a infrared thermal imager and the evapotranspiration by recording change of module weight were measured at intervals of 30 minutes from sunrise to sunset. The results show that the mean surface temperature of the green roof was 15.4 degrees lower than that of the non-green roof from 12:00 P.M. to 14:00 P.M. There was no significant difference between mean surface temperature of green roof with and without storage system immediately after rain, but more than a week after rain, there was a difference with average of 2.49 degrees and maximum of 4.72 degrees. The difference in daily amount of evapotranspiration was measured to be 1.66 times on average. As drought stress increased over time, the difference in daily amount of evapotranspiration and surface temperature between with/without storage system increased simultaneously. The results of the study show a more excellent cooling effect of green roof combined with the rainwater storage system.

Keywords

Acknowledgement

본 결과물은 환경부의 재원으로 한국환경산업기술원의 도시생태 건강성 증진 기술개발사업의 지원을 받아 연구 되었습니다.(2020002770003)

References

  1. Aram, F..Garcia, E.H..Solgi, E..Mansounia, S. 2019. Urban green space cooling effect in cities. Heliyon. 5(4): e01339. https://doi.org/10.1016/j.heliyon.2019.e01339
  2. Ballinas, M and Barradas, V.L. 2016. The Urban Tree as a Tool to Mitigate the Urban Heat Island in Mexico City: A Simple Phenomenological Model. Journal of Environment Quality. 45(1): 157-166. https://doi.org/10.2134/jeq2015.01.0056
  3. Berndtsson, J.C..Emilsson, T..Bengtsson, L. 2006. The influence of extensive vegetated roofs on runoff water quality. Science of the total environment, 355: 48-63. https://doi.org/10.1016/j.scitotenv.2005.02.035
  4. Cai, L..Feng, X.P..Yu, J.Y..Xiang, Q.C..Chen, R. 2019. Reduction in Carbon Dioxide Emission and Energy Savings Obtained by Using a Green Roof. Aerosol Air Qual. Res. 19: 2432-2445. https://doi.org/10.4209/aaqr.2019.09.0455
  5. Campillo, C..Fortes, R..Henar Prieto, M.D.H. 2012. Solar Radiation Effect on Crop Production. Solar Radiation. 1: 494.
  6. Cascone, S..Coma, J..Gagliano, A..Perez, G. 2019. The evapotranspiration process in green roofs: A review. Building and Environment. 147: 337-355. https://doi.org/10.1016/j.buildenv.2018.10.024
  7. Charalambous, K..Bruggeman, A..Eliades, M..Camera, C..Vassiliou, L. 2019. Stormwater Retention and Reuse at the Residential Plot Level-Green Roof Experiment and Water Balance Computations for Long-Term Use in Cyprus. Water. 11(5): 1055. https://doi.org/10.3390/w11051055
  8. Chiaradia, E.A..Gandolfi, C..Castelli, F. Masseroni, D. 2018. Evaluating performances of green roofs for stormwater runoff mitigation in a high flood risk urban catchment. Journal of Hydrology. 566: 830-845. https://doi.org/10.1016/j.jhydrol.2018.09.050
  9. Chow, W.T.L. and Roth, M. 2006. Temporal dynamics of the urban heat island of Singapore. International Journal of Climatology. 26. 2243-2260. https://doi.org/10.1002/joc.1364
  10. Ercolani, G..Chiaradia, E.A..Gandolfi, C..Castelli, F..Masseroni, D. 2018. Evaluating performances of green roofs for stormwater runoff mitigation in a high flood risk urban catchment. Journal of Hydrology. 566: 830-845. https://doi.org/10.1016/j.jhydrol.2018.09.050
  11. Gagliano, A..Detommaso, M..Nocera, F..Evola, F. 2015. A multi-criteria methodology for comparing the energy and environmental behavior of cool, green and traditional roofs. Building Environment. 90: 71-81. https://doi.org/10.1016/j.buildenv.2015.02.043
  12. Gill, S..Handley, J..Ennos, R..Pauleit, S. 2007. Adapting cities for climate change: the role of the green infrastructure. Built Environment. 33(1): 115-133. https://doi.org/10.2148/benv.33.1.115
  13. He, C..Zhao, J..Zhang, Y..Yao, Y..Ma, W..Kinney, P.L. 2020. Cool Roof and Green Roof Adoption in a Metropolitan Area: Climate Impacts during Summer and Winter. Environmental Science & Technology. 54(17): 10831-10839. https://doi.org/10.1021/acs.est.0c03536
  14. Hoffmann, P..Krueger, O..Schlunzen, K.H. 2012. A statistical model for the urban heat island and its application to a climate change scenario. International Journal of Climatology. 32(8): 1238-1248. https://doi.org/10.1002/joc.2348
  15. Jaffal, I..Ouldboukhitine, S..Belarbi, R. 2012. A comprehensive study of the impact of green roofs on building energy performance. Renew. Energy, 43: 157-164. https://doi.org/10.1016/j.renene.2011.12.004
  16. Jim, C.Y. and Tsang, S.W. 2011. Modeling the heat diffusion process in the abiotic layers of green roofs. Energy Building. 43: 1341-1350. https://doi.org/10.1016/j.enbuild.2011.01.012
  17. Lee, D.K..Yoon, S.W..Oh, S.H..Jang, S.W. 2005. The Effect of Temperature Reduction asInfluenced by Rooftop Greening. Journal of the Korea Society of Environmental Restoration Technology, 8(6): 34-44.
  18. Lee, D.K..Oh, S.H..Yoon, S.W..Jang, S.W. 2006. A Field Study to Evaluate Greenroof Runoff Reduction and Delay. Journal of the Korea Society of Environmental Restoration Technology, 9(6): 117-122.
  19. Lee, E.H..Jang, H.K..Ahn, G.Y. 2011. Effects of Extensive Green Roof System on Rainwater Circulation. Journal of the Korea Society of Environmental Restoration Technology. 14(4): 81-88. https://doi.org/10.13087/KOSERT.2011.14.4.081
  20. Mirzaei, P.A and Haghighat, F. 2010. Approaches to study Urban Heat Island - Abilities and limitations. Building and Environment. 45(10): 2192-2201. https://doi.org/10.1016/j.buildenv.2010.04.001
  21. Morakinyo, T.E..Kalani,.K.W.D..Dahanayake, C..Ng, E..Chow, C.L. 2017. Temperature and cooling demand reduction by green-roof types in different climates and urban densities: a co-simulation parametric study. Energy Building. 145: 226-237. https://doi.org/10.1016/j.enbuild.2017.03.066
  22. Norton, B.A..Coutts, A.M..Livesley, S.J..Harris, R.J..Hunter, A.M..Williams, N.S.G. 2015. Planning for cooler cities: a framework to prioritise green infrastructure to mitigate high temperatures in urban landscapes. Landscape and Urban Planning. 134: 127-138. https://doi.org/10.1016/j.landurbplan.2014.10.018
  23. O'Loughlin, J..Witmer, F.D.W..Linke, A.M..Laing, A..Gettelman, A..Dudhia, J. 2012. Climate variability and conflict risk in East Africa, 1990-2009. Proceedings of the National Academy of Sciences. 109(45): 18344-18349. https://doi.org/10.1073/pnas.1205130109
  24. Oke, T. R. 1988. Street design and urban canopy layer climate. Energy and Building. 11: 103-113. https://doi.org/10.1016/0378-7788(88)90026-6
  25. Pisello, A. L. and Cotana, F. 2014. The thermal effect of an innovative cool roof on residential buildings in Italy: Results from two years of continuous monitoring. Energy Build. 69: 154-164. https://doi.org/10.1016/j.enbuild.2013.10.031
  26. Parker, D.E. 2010. Urban heat island effects on estimates of observed climate change. Wiley Interdisciplinary Reviews: Climate Change. 1(1): 123-133. https://doi.org/10.1002/wcc.21
  27. Radhi, H..Fikry, F..Sharples, S. 2013. Impacts of urbanisation on the thermal behaviour of new built up environments: A scoping study of the urban heat island in Bahrain. Landscape and Urban Planning. 113: 47-61. https://doi.org/10.1016/j.landurbplan.2013.01.013
  28. Rahman, M.A..Moser, A..Gold, A..Rotzer, T..Pauleit, S. 2018. Vertical air temperature gradients under the shade of two contrasting urban tree species during different types of summer days. Science of The Total Environment. 633: 100-111. https://doi.org/10.1016/j.scitotenv.2018.03.168
  29. Raimondi, A. and Becciu, G. 2021. Performance of Green Roofs for Rainwater Control. Water Resources Management. 35: 99-111. https://doi.org/10.1007/s11269-020-02712-3
  30. Synnefa, A..Saliari, M..Santamouris, M. 2012. Experimental and numerical assessment of the impact of increased roof reflectance on a school building in Athens. Energy Build. 55: 7-15. https://doi.org/10.1016/j.enbuild.2012.01.044
  31. Tang, X. and Qu, M. 2016. Phase change and thermal performance analysis for green roofs in cold climates. Energy Build. 121: 165-175. https://doi.org/10.1016/j.enbuild.2016.03.069
  32. VanWoert, N.D..Rowe, D.B..Andresen, J.A..Rugh, C.I..Fernandez, R.T..Xiao, L. 2005. Green roof stormwater retention : Effects of roof surface, slope, and media depth. Journal of Environmental Quality. 34: 1036-1044. https://doi.org/10.2134/jeq2004.0364
  33. White, I. and Alarcon, A. 2009. Planning policy, sustainable drainage and surface water management: a case study of Greater Manchester. Built Environment. 35(4): 516-530. https://doi.org/10.2148/benv.35.4.516