The Effects of Urban Heat Islands Mitigation on Human Health through Change in Urban form Hot and Arid Climate of Mashhad (Case Study: Graticular Texture of Shahed and Organic Texture of Pachenar Neighborhoods)
Subject Areas :
Architecture and urbanism
Elham sanagar darbani
1
,
Mojtaba Rafieian
2
,
toktam hanaee
3
,
danial monsefi parapari
4
1 - M.A , Urban Design, Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran
2 - Associated Professor, Faculty Member, Arts &Amp, Architecture School, Tarbiat Modares University, Tehran
3 - Assistant Professor, Department of Urban Planning and Urban Designing, Mashhad Branch, Islamic Azad University, Mashhad, Iran
4 - Assistant Professor ,Faculty of Architectural Engineering and Urbanism, Shahrood University of Technology, Shahrood, Iran
Received: 2018-01-25
Accepted : 2018-11-18
Published : 2020-06-21
Keywords:
Human health,
Envi-Met,
Urban form,
Mashhad,
urban heat island,
Abstract :
Background and Objective: The increase in heat waves in cities has caused many problems for human health. Reducing environmental problems by reducing the ambient temperature and thus improving human health is one of the most important concerns in the present age, which can be achieved by changing urban forms and environmental elements.
Method: The main method used in this research is numerical simulations, using Envi-Met and Leonardo software suites.
Findings: The findings indicate that the higher the height-to-width ratio, the less access sunlight has to the environment, resulting in lower ambient temperatures. Shading due to the ratio (H / w), the presence of plants and wind in urban valleys can also reduce the ambient temperature. In addition, the reduction of impermeable surfaces of urban coatings and the presence of materials with high albedo, increase evapotranspiration, which provides cooling conditions for urban environments and reduces the adverse effects of urban heat on human health.
Conclusion: As a result, creating shadows through a combination of vegetation and diverse alterations in structures of H / W can be effective on reducing the ambient and surface temperatures. Moreover, the use of permeable surfaces and building materials with high albedo are effective in reflecting solar heat and can reduce the intensity of urban heat islands.
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Arnfield , J. 2003. Two decades of urban climate research: A review of turbulence, exchanges of energy and water, and the urban heat island. International Journal of Climatology, Vol.23,No.1,pp. 1-26
Oke, T. R. 1988. Street Design and Urban Canopy Layer Climate. Energy and Buildings, Vol.11, No.1-3.
Middel, A., Häb, K., Brazel, A. J., Martin, C. A., Guhathakurta, S. 2014. Impact of urban form and design on mid-afternoon microclimate in Phoenix Local Climate Zones. Landscape and Urban Planning, Vol.122, pp.16-28
Azmoodeh,M., Heidari,S,.2017. Effect of Urban Green Walls on Reduction of Temperature in Microclimates and Urban Heat Island. Journal of Environmental Science and Technology,Vol.19,No.5,597-606 (persian).
_||_
- Akbari, H. 2005. Energy Saving Potentials and Air Quality Benefits of Urban HeatIslandMitigation: Lawrence Berkeley National Laboratory: Lawrence Berkeley National Laboratory.
- Yahia, M. W., Johansson, E., Thorsson, S., Lindberg, F., Rasmussen, M. I. 2017. Effect Of Urban Design On Microclimate And Thermal Comfort Outdoors In Warm-Humid Dar Es Salaam, Tanzania. International Journal of Biometeorology,Vol.62,No.3,pp.373-385
Ahmadpour,N., Pourjafar,M. ; Mahdavinejad ,M., Yousefian.,S,.2017. The Role and Impact of Design Elements on the Quality of Thermal Comfort in Urban Open Spaces Case Study: Design of Pedestrian Way in Tamghachiha Pathway in the City of Kashan. Journal Of Architecture and Urban Planning,Vol9,No.18.pp.59-80 (persian).
Bruse, M. 2015. ENVI-metModel Homepage: https://www.envi-met.com
Bruse, M. Simulating microscale climate interactions in complex terrain with a high- resolution numerical model: A case study for the Sydney CBD Area (Model Description). Paper presented at the International Conference on Urban Climatology & international congress of biometeorology,1999, Sydney, Australia.
Wang, Y., & Akbari, H. 2016. The effects of street tree planting on Urban Heat Island mitigation in Montreal. Sustainable Cities and Society, Vol. 27, pp.122-128
Che-Ani, A. I., Shahmohamadi, P., Sairi, A., Mohd-Nor, M. F. I., Sain, M. F. M., Surat, M. 2009. Mitigating the urban heat island effect: Some points without altering existing city planning. European Journal of Scientific Research,Vol. 35, No. 2,pp.204-216.
Gupta, S., Anand, P., Shashwat. 2015. Improvement of outdoor thermal comfort for a residential development in Singapore. International Journal of Energy and Environment (IJEE), Vol.6,No.6, pp.567-586
Monsefi Parapari, D. Adaptation to Climate Change and Thermal Comfort. PHD Dissertation, Dortmund University of Technology,2015,pp.259
WHO. 2007. The Large Analysis and Review of European Housing and Health Status (LARES). Retrieved from Copenhagen, Denmark: http://www.euro.who.int/en/health-topics/environment-and-health/Housing-and-health/activities/the-large-analysis-and-review-of-european-housing-and-health-status-lares-project.
Linares, C., & Dı´az, J. 2007. Impact of high temperatures on hospital admissions: comparative analysis with previous studies about mortality (Madrid). European Journal of Public Health,Vol. 18,No. 3, pp.317–322.
Pirard, P., Vandentorren, S., Pascal, M., Laaidi, K., Le Tertre, A., Cassadou, S., Ledrans, M. 2005. Summary Of The Mortality Impact Assessment Of The 2003 Heat Wave In France. Euro Surveill,Vol.10, No.7,pp. 153–156
Yang, L., Qian, F., Song, D.-X., Zheng, K.-J. 2016. Research on Urban Heat-Island Effect. Procedia Engineering, Vol.169, pp.11-18
Hansen, A., Bi, P., Nitschke, M., Ryan, P., Pisaniello, D., Tucker, G. 2008. The effect of heat waves on mental health in a temperate Australian city, Environ. Health Perspect,Vol. 116,pp. 1369–1375.
Ünlü, T. 2011. Towards the Conceptualization of Piecemeal Urban Transformation: The Case of Mersin, Turkey. Built Environment, Vol. 37,No.4, pp.445-461
Saud Alznafer, B. M. The Impact Of Neighbourhood Geometries On Outdoor Thermal Comfort And Energy Consumption From Urban Dwellings A Case Study Of The Riyadh City, The Kingdom Of Saudi Arabia. PHD Dissertation , Cardiff University,2014,pp.373.
Krüger, E. L., Minella, F. O., Rasia, F. 2011. Impact of urban geometry on outdoor thermal comfort and air quality from field measurements in Curitiba, Brazil. Building and Environment, Vol.46,No.3, pp.621-634
Esther, M. M., & Sagada, M. L. 2014. An Evaluation Of Thermal Comfort Conditions In An Urban Entertainment Centre In Hot-Dry Climate Of Nigeria. International Journal of Energy and Environmental Research, Vol.2, No. 1,pp. 55-74
Abreu-Harbich, L. V., Labaki, L. C., & Matzarakis, A. 2014. Thermal bioclimate in idealized urban street canyons in Campinas. Brazil Theoretical and Applied Climatology, Vol.115,No.(1-2),pp.115-223
Georgi, N., Tzesouri, A. Monitoring Thermal Comfort in Outdoor Urban Spaces for Bioclimatic Conditions Improvement, 1st WSEAS International Conference On Landscape Architecture,2008, Portugal.
Rodríguez Algeciras , J. A., Consuegra, L. G. a., & Matzarakis, A. 2016. Spatial-temporal study on the effects of urban street configurations on human thermal comfort in the world heritage city of Camagüey-Cuba. Building and Environment, ). Impact of High Temperatures on Mortality: Is There an Added Heat Wave Effect, Voll.101,pp. 85-101
Lilly Rose, A., Devadas, M. D. Analysis of Land Surface Temperature and Land Use/Land Cover Types Using Remote Sensing Imagery - A Case In Chennai City, India The seventh International Conference on Urban Clim, 2009,Yokohama, Japan.
Jamei, E., Rajagopalan, P., Seyedmahmoudian, M., Jamei, Y. 2016. Review On The Impact Of Urban Geometry And Pedestrian Level Greening On Outdoor Thermal Comfort. Renewable and Sustainable Energy Reviews,Vol. 54,pp. 1002–1017
Arnfield , J. 2003. Two decades of urban climate research: A review of turbulence, exchanges of energy and water, and the urban heat island. International Journal of Climatology, Vol.23,No.1,pp. 1-26
Oke, T. R. 1988. Street Design and Urban Canopy Layer Climate. Energy and Buildings, Vol.11, No.1-3.
Middel, A., Häb, K., Brazel, A. J., Martin, C. A., Guhathakurta, S. 2014. Impact of urban form and design on mid-afternoon microclimate in Phoenix Local Climate Zones. Landscape and Urban Planning, Vol.122, pp.16-28
Azmoodeh,M., Heidari,S,.2017. Effect of Urban Green Walls on Reduction of Temperature in Microclimates and Urban Heat Island. Journal of Environmental Science and Technology,Vol.19,No.5,597-606 (persian).
