Abstract
In Indian cities where streets are the only affordable outdoor public space, pedestrians are always exposed to extreme heat related health risk. However, it’s a challenge to reduce heat stress in existing streets characterized by asymmetrical urban configuration. Integrating vegetation without reconstituting the original orientation and geometry is one of the feasible ways to alleviate stress. Therefore, current study focuses to analyse the heat stress reduction potential of urban greenery strategy in asymmetrical urban configuration from spatiotemporal perspective. It initiates with the selection of commercial streets in extreme hot climate with an on-site measurement of its climatic and morphological attributes. Furthermore, it leads to the classification and prioritizing of street's sections linked to hot-spots determined by varied sky view factor and asymmetrical aspect ratio. Finally, an Envi-Met model with iterated scenarios at the building and street levels is developed, incorporating three strategies (trees, grass, green-walls). The impact of heat related health risk is quantified using a thermal index Universal Thermal Climate Index along with air temperature and mean radiant temperature. The results suggested that due to asymmetricity a fixed strategy would not be applicable across the street. The highest reduction was observed by trees in asymmetrical sections while lowest was recorded by green-wall. However, it would be worthwhile to adopt green-wall along with dense tree’s (leaf area density, 0.3) in order to reduce the heat stress in deeper sections. The evidence-based integration of Urban greenery can assist planners and designers in mitigating extreme heat stress in similar complex urban environment.
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References
Abdi BHZ (2020) Impact of small-scale tree planting patterns on outdoor cooling and thermal comfort. Sustain Cities Soc 56:1–12. https://doi.org/10.1016/j.scs.2020.102085
Aboelata A (2020) Vegetation in different street orientations of aspect ratio (H/W 1:1) to mitigate UHI and reduce buildings’ energy in arid climate. Build Environ. https://doi.org/10.1016/j.buildenv.2020.106712
Aboelata A, Sodoudi S (2019) Evaluating urban vegetation scenarios to mitigate urban heat island and reduce buildings’ energy in dense built-up areas in Cairo. Build Environ 166:106407
Akbari H, Kolokotsa D (2016) Three decades of urban heat islands and mitigation technologies. Energy and Buildings 133:834–842
Akbari H, Konopacki (2004) Energy effects of heat-island reduction strategies in Toronto Canada. Energy Build 29(2):191–210
Akbari H (2001) Cool surfaces and shade trees to reduce energy use and improve air quality in urban areas. Sol Energy 70:295–310. https://doi.org/10.1016/S0038-092X(00)00089-X
Ali and Patnaik (2018) Thermal comfort in urban open spaces-Objective assessment and subjective perception study in tropical city of Bhopal India. Urban Climate 24, 954–967. https://doi.org/10.1016/j.uclim.2017.11.006
Ali and Patnaik (2019) Assessment of the impact of urban tree canopy on microclimate in Bhopal: A devised low-cost traverse methodology. Urban Climate 27, 430–445. https://doi.org/10.1016/j.uclim.2019.01.004
Ali T, Mayer (2007) Thermal comfort in an east-west oriented street canyon in Freiburg (Germany) under hot summer conditions. Theoret Appl Climatol 87(1–4):223–237. https://doi.org/10.1007/s00704-005-0194-4
Ali-Toudert and Mayer (2007) Effects of asymmetry, galleries, overhanging facades and vegetation on thermal comfort in urban street canyons. Solar Energy 81(6), 742–754. https://doi.org/10.1016/j.solener.2006.10.007
Ali-Toudert FDM (2005) Outdoor thermal comfort in the old desert city of Beni-Isguen. Algeria Climate Research 28(3):243–256. https://doi.org/10.3354/cr028243
Armstrong L. E. C. M. (2007). Exertional Heat Illness during Training and Competition. Medicine & Science in Sports & Exercise 556–572
ASHRAE 55 (2017) Thermal Environmental Conditions. In ASHRAE, ASHRAE
Atwa IM (2020) Evaluation of plantation design methodology to improve the human thermal comfort in hot-arid climatic responsive open spaces. Sustain Cities Soc 59:102198. https://doi.org/10.1016/j.scs.2020.102198
Banerjee, Chattopadhyay (2020) A meta-analytical review of outdoor thermal comfort research: Applications, gaps and a framework to assess low-income settlements in Indian megacities. Urban Climate 33:100641. https://doi.org/10.1016/j.uclim.2020.100641
Banerjee SMC (2020) Outdoor thermal comfort in various microentrepreneurial settings in hot humid tropical Kolkata: Human biometeorological assessment of objective and subjective parameters. Sci Total Environ 721:137741. https://doi.org/10.1016/j.scitotenv.2020.137741
BIS SP7, B. (2005). National building code of India. New Delhi
BIS, S. 7. (2005) SP 7:2005, national building code of India 2005. New Delhi: Bureau of Indian Standards BIS
Bosselmann PAE (1995) Urban Form and Climate: Case Study Toronto. J Am Plann Assoc 61(2):226–239
Brinda D, Faiz A (2020) Quantitative outdoor thermal comfort assessment of street: A case in a warm and humid climate of India. Urban Climate 34:100718. https://doi.org/10.1016/j.uclim.2020.100718
Census of India (2011) Census of India. Retrieved from http://censusindia.gov.in/. Accessed 25 Sept 2023
Chen L, Ng E (2012) Outdoor thermal comfort and outdoor activities: a review of research in the past decade. Cities 29(2):118–125. https://doi.org/10.1016/j.cities.2011.08.006
Chen LNE (2012) Sky view factor analysis of street canyons and its implications for daytime intra-urban air temperature differentials in high-rise, high-density urban areas of Hong Kong: a GIS-based simulation approach. Int J Climatol 32(1):121–136. https://doi.org/10.1002/joc.2243
Cheung HKCL (2016) Urban heat island analysis of Greater Manchester, UK using sky view factor analysis. Build Serv Eng Technol 31:05–17
Das M et al. (2020) Outdoor thermal comfort in different settings of a tropical planning region of eastern India by adopting LCZs approach: a case study on Sriniketan-Santiniketan planning area (SSPA). Sustainable Cities Socities 102433. https://doi.org/10.1016/j.scs.2020.102433.
De Abreu-Harbich LM (2015) Effect of tree planting design and tree species on human thermal comfort in the tropics. Landsc Urban Plan 138:99–109. https://doi.org/10.1016/j.landurbplan.2015.02.008
ECBC. (2017). Energy Conservation Building Code. Delhi: Ministry of renewable energy.
Emmanuel and Johansson (2006) Influence of urban morphology and sea breeze on hot humid microclimate: the case of Colombo, Sri Lanka. Clim Res 30(3), 189-200https://doi.org/10.3354/cr030189
FSI. (2015) Forest Survey of India (Ministry of Environment, Forest, and Climate Change), Dehradun, India, 2015
Giannopoulou KSM (2010) The impact of canyon geometry on intra urban and urban: suburban night temperature differences under warm weather condition. Pure Appl Geophys 167(11):1433–1449. https://doi.org/10.1007/s00024-010-0099-8
Giridharan & Lau (2008). Numerical simulation studies of the different vegetation pattern effects on outdoor pedestrian thermal comfort. J Wind Eng Indust Aerodynam 96, 1707–17018
Goh and Chang (1999) The relationship between height to width ratios and the heat island intensity at 22:00 hour for Singapore. Intl J Climatol 19, 1011-1023
Gonzalez RRNY (1974) Experimental evaluation of standard effective temperature a new biometeorological index of man’s thermal discomfort. Int J Biometeorol 18:1–15
Grahame MB (2008) Wet Bulb globe temprerture (WBGT)-its history and its limitations. J Sci Med Sport 11:20–32
Guo A et al (2020) Influences of urban spatial form on urban heat island effects at the community level in China. Sustain Cities Soc 53:101972. https://doi.org/10.1016/j.scs.2019.101972
Herath et al. (2018). Evaluation of green infrastructure effects on tropical Sri Lankan urban context as an urban heat island adaptation strategy. Urban Forest Urban Green, 29, 212–222. https://doi.org/10.1016/j.ufug.2017.11.013
Hoppe P (2002) Different aspects of assessing indoor and outdoor thermal comfort. Energy and Buildings 34:661–665
IRC:021. (2009) Guidelines on landscaping and tree plantation. Delhi
IRC:SP119. (2018) Manual of planting and landscaping of urban roads. Delhi: IRC
ISHARE, I. S. (2022). Indian weather data. Delhi: ISHARE
Jendritzky GD (2012) UTCI-why another thermal index? Int J Biometeorol 56:421–428. https://doi.org/10.1007/s00484-011-0513-7
Johansson and Emmanuel (2006) The influence of urban design on outdoor thermal comfort in the hot, humid city of Colombo Sri Lanka. Intl J Biometeorol 51, 119-133https://doi.org/10.1007/s00484-006-0047-6
Johansson E (2017) Outdoor thermal comfort in public space in warm-humid Guayaquil, Ecuador. Intl J Biometeorol. https://doi.org/10.1007/s00484-017
Johansson E (2006) Influence of urban geometry on outdoor thermal comfort in a hot dry climate: a study in Fez Morocco. Build Environ 41:1326–1338. https://doi.org/10.1016/j.buildenv.2005.05.022
Karimi AEA (2020) Evaluation of the thermal indices and thermal comfort improvement by different vegetation species and materials in a medium-sized urban park. Energy Rep 6:1670–1684. https://doi.org/10.1016/j.egyr.2020.06.015
Khare VV (2021) A big picture of urban heat island mitigation strategies and recommendation for India. Urban Climate 37:100845. https://doi.org/10.1016/j.uclim.2021.100845
Klemm WBG (2015) Street greenery and its physical and psychological impact on thermal comfort. Landsc Urban Plan 138:87–98. https://doi.org/10.1016/j.landurbplan.2015.02.009
Kong LLY (2017) Regulation of outdoor thermal comfort by trees in Hong Kong. Sustain Cities Soc 31:12–25. https://doi.org/10.1016/j.scs.2017.01.018
Kumar and Sharma (2020) Study on importance, procedure, and scope of outdoor thermal comfort- A review. Sustain Cities Soc 61 102297. https://doi.org/10.1016/j.scs.2020.102297
Kytta M et al (2013) Towards contextually sensitive urban densification: Location-based softGIS knowledge revealing perceived residential environmental quality. Landsc Urban Plan 113:30–46. https://doi.org/10.1016/j.landurbplan.2013.01.008
Lai DGD (2014) Studies of outdoor thermal comfort in northern China. Build Environ 77:110–118. https://doi.org/10.1016/j.buildenv.2014.03.026
Lai JWZ (2018) Does quality control matters? Surface urban heat island intensity variations estimated by satellite derived land surface temperature products. Remote Sensining 139:212–227
Lehnert MGJ (2021) Comparison between mental mapping and land surface temperature in two Czech cities: A new perspective on indication of locations prone to heat stress. Build Environ 203:108090
Lemmon P (1956) A spherical densiometer for estimating forest overstory density. For Sci 4:314–320
Li KZY (2016) Outdoor thermal comfort and activities in the urban residential community in a humid subtropical area of China. Energy and Buildings 133:498–511. https://doi.org/10.1016/j.enbuild.2016.10.013
Lin TPMA (2010) Shading effect on long-term outdoor thermal comfort. Build Environ 45(1):213–221. https://doi.org/10.1016/j.buildenv.2009.06.002
Lobaccaro G, Acero (2015) Comparative analysis of green actions to improve outdoor thermal comfort inside typical urban street canyons. Urban Climate 14:251–267. https://doi.org/10.1016/j.uclim.2015.10.002
Maharoof NRE (2020) Compatibility of local climate zone parameters for climate sensitive street design: Influence of openness and surface properties on local climate. Urban Climate 33(2020):100642. https://doi.org/10.1016/j.uclim.2020.100642
Manob and Arijit (2020) Exploring the pattern of outdoor thermal comfort (OTC) in a tropical planning region of eastern India during summer. Urban Climate 34 100708. https://doi.org/10.1016/j.uclim.2020.100708
Matzarakis AMI (1999) Applications of a universal thermal index: physiological equivalent temperature. Int J Biometeorol 43(2):76–84. https://doi.org/10.1007/s004840050119
Mayer and Hoppe (1987) Thermal comfort of man in different urban environments. Theor Appl Climatol 38, 43–49. https://doi.org/10.1007/BF00866252
Mayer EH (1993) Urban bioclimatology. Urban bioclimatology 957–963
Mc Pherson RA (2007) A review of vegetation atmosphere interactions and their influences on mesoscale phenomena. Prog Phys Geogr 31(3):261–285
Morakinyo TE-K-L (2019) Thermal benefits of vertical greening in a high-density city: Case study of Hong Kong. Urban Forest Urban Green 37:42–45. https://doi.org/10.1016/j.ufug.2017.11.010
Morakiny and Lam (2016) Simulation Study on the Impact of Tree-Configuration, Planting Pattern and Wind Condition on Street-Canyon’s Micro-Climate and Thermal Comfort. Build Environ 103:262–275. https://doi.org/10.1016/j.buildenv.2016.04.025
Morakinyo ETK-L (2017) A study on the impact of shadow-cast and tree species on in-canyon and neighborhood’s thermal comfort. Build Environ. https://doi.org/10.1016/j.buildenv.2017.01.005
Ng Edward CL (2012) A study on the cooling effects of greening in a high-density city: An experience from Hong Kong. Build Environ 47:256–271. https://doi.org/10.1016/j.buildenv.2011.07.014
ParapariTaslim SA (2015) Urban design guidelines to mitigate urban heat island effects in hot-dry cities. Technol J 74:119–124
Peng Y et al. (2021) Urban ventilation of typical residential streets and impact of building form variation. Sustain Cities Soc 67. https://doi.org/10.1016/j.scs.2021.102735
Perini KCA (2018) Green streets to enhance outdoor comfort. Nature based strategies for urban and building sustainability. https://doi.org/10.1016/B978-0-12-812150-4.00011-2
Pir M et al (2021) Evaluating the role of the albedo of material and vegetation scenarios along the urban street canyon for improving pedestrian thermal comfort outdoors. Urban Climate 40:100993. https://doi.org/10.1016/j.uclim.2021.100993
Qaid A, Ossen D (2014) Effect of asymmetrical street aspect ratio on micrclimates in hot, humid regions. Intl J Biometrol 59(6):657–677. https://doi.org/10.1007/s00484-014-0878-5
Raman VMK (2021) A quantitative assessment of the dependence of outdoor thermal-stresses on tree-building morphology and wind: A case-study in sub-tropical Patna India. Sustain Cities Soc 73:103085. https://doi.org/10.1016/j.scs.2021.103085
Ridha JS (2018) Urban heat island mitigation strategies in an arid climate. Civil Engineering INSA de Toulouse 111–120
Rodríguez AJT (2018) Effect of asymmetrical street canyons on pedestrian thermal comfort in warm-humid climate of Cuba. Theor Appl Climatol 133(3):663–679. https://doi.org/10.1007/s00704-017-2204-8
Saeid Teshnehdel HA (2020) Effect of tree cover and tree species on microclimate and pedestrian comfort in a residential district in Iran. Build Environ 178:106899. https://doi.org/10.1016/j.buildenv.2020.106899
Sajad ZNH (2018) Comparing Universal Thermal Climate Index (UTCI) with selected thermal indices/environmental parameters during 12 months of the year. Weather Clim Extrem 49–57
Salleh E (2006) Tropical urban street canyons. In: J.-H. B. Ong (eds) Tropical sustainable architecture: social and environmental dimensions, Vol 9780080470924. p 201. Elsevier, London. https://doi.org/10.4324/9780080470924
Salvati RC (2017) Assessing the urban heat island and its energy impact on residential buildings in Mediterranean climate: Barcelona case study. Energy Building 146:38–54
Savvides CV (2019) Sitting and building-massing considerations for the urban integration of active solar energy systems. Renewable Energy 135:963–974
Savvides AMP (2016) Examination and assessment of insolation conditions of streetscapes of traditional settlements in the Eastern Mediterranean area. Habitat Int 53:442–452
Shashua-Bar and Hoffman (2000) Vegetation as a climatic component in the Design of an Urban Street. Energy and Buildings 31(3):221–235. https://doi.org/10.1016/S0378-7788(99)00018-3
Shashua-Bar L, Tsiros IH (2012) Passive cooling design options to ameliorate thermal comfort in urban streets of a Mediterranean climate (Athens) under hot summer conditions. Build Environ 57:110–119. https://doi.org/10.1016/j.buildenv.2012.04.019
Shashua-Bar LPD (2011) The influence of trees and grass on outdoor thermal comfort in a hot-arid environment. Int J Climatol 31(10):1498–1506. https://doi.org/10.1002/joc.2177
Shashua-Bar LTI (2012) Passive cooling design options to ameliorate thermal comfort in urban streets of a Mediterranean climate (Athens) under hot summer conditions. Build Environ 57:110–119. https://doi.org/10.1016/j.buildenv.2012.04.019
Spagnolo and De-Dear (2003) A field study of thermal comfort in outdoor and semioutdoor environments in subtropical Sydney Australia. Build Environ 38:721–738
Oke TR (1973) City size and the urban Heat Island. Atmos Environ Pergam Press 7:769–779. https://doi.org/10.1016/0004-6981(73)90140-6
Oke TR (2006) Initial guidance to obtain representative meteorological observations at urban sites. Instruments and observing methods (Vols. WMO/TD-No. 1250). Canada: World Meteorological Organization. http://www.wmo.int/pages/prog/www/IMOP/publications/IOM-81/IOM-81-UrbanMetObs.pdf
Oke TR (2006b) Towards better scientific communication in urban climate. Theoret Appl Climatol 84:179–190
Taha H (1997) Urban climates and heat islands: albedo, evapotranspiration and anthropogenic heat. Energy and Building 25:99–103
Takebayashi H, Moriyama M (2012) Relationships between the properties of an urban street canyon and its radiant environment: introduction of appropriate urban heat island mitigation technologies. Sol Energy 86:2255–2262. https://doi.org/10.1016/j.solener.2012
Taleghani MLK (2014) Outdoor thermal comfort within five different urban forms in The Netherlands. Build Environ 83:65–78
Teoh MYSM (2021) Developing Climate-Led Landscapes and Greenery in Urban Design: A Case Study at Ipoh Malaysia. J Asian Architect Build Eng. https://doi.org/10.1080/13467581.2021.1942881
Wanlu Ouyang TE (2023) How to quantify the cooling effects of green infrastructure strategies from a spatio-temporal perspective: Experience from a parametric study. Landsc Urban Plann, 237(104808). https://doi.org/10.1016/j.landurbplan.2023.104808
Willmott C (1981) On the validation of models. Phys Geogr 2:184–194. https://doi.org/10.1080/02723646.1981.10642213
Yahia MWJE (2018) Effect of urban design on microclimate and thermal comfort outdoors in warm-humid Dar es Salaam Tanzania. Intl J Biometrol 62:373–385
Yang W et al (2018) Effects of landscape design on urban microclimate and thermal comfort in tropical climate. Adv in Meteorol 13. https://doi.org/10.1155/2018/2809649
Yuan and Chen (2011) Mitigating urban heat island effects in high-density cities based on sky view factor and urban morphological understanding: a study of Hong Kong. Architect Sci Rev 54:305–315
Zolch T et al (2016) Using green infrastructure for urban climate-proofing: An evaluation of heat mitigation measures at the microscale. Urban Forest Urban Green 20:305–316. https://doi.org/10.1016/j.ufug.2016.09.011
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Ojha, S.K., Mukherjee, M. Investigating the potential of integrated urban greening strategies for reducing outdoor thermal stresses: a case of asymmetrical configuration in the tropical city of Bhopal. Int J Biometeorol (2024). https://doi.org/10.1007/s00484-024-02680-y
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DOI: https://doi.org/10.1007/s00484-024-02680-y