بررسی میزان تاثیرگذاری انواع پوشش گیاهی بر آسایش حرارتی در تنگه‌های شهری در اقلیم گرم و خشک
الموضوعات :
طاهره کولیوند
1
,
نازنین نصرالهی
2
1 - عضو هیات علمی،گروه ساختمان و معماری، دانشگاه فنی حرفه ای، تهران، ایران. *(مسوول مکاتبات)
2 - دانشیار، گروه مهندسی معماری، دانشگاه ایلام، ایلام، ایران
تاريخ الإرسال : 24 السبت , شوال, 1442
تاريخ التأكيد : 01 الأربعاء , صفر, 1443
تاريخ الإصدار : 27 الأحد , ربيع الأول, 1444
الکلمات المفتاحية:
اصفهان,
آسایش حرارتی,
Envi-Met,
تنگه های شهری,
پوشش گیاهی,
ملخص المقالة :
زمینه و هدف: پوشش گیاهی در فرم‌های مختلفی در شهرها و در تنگه‌های شهری بکار گرفته می‌شود و با سایه‌اندازی و یا سرمایش تبخیری به بهبود شرایط دمایی محیط کمک می‌کند. بررسی‌های انجام‌گرفته در شهر اصفهان نشان می‌دهد که چمن، بوته و درخت سه فرم پرتکرار در تنگه‌های این کلان شهر است. هدف این تحقیق انتخاب بهترین فرم پوشش گیاهی در تنگه های شهری اصفهان با توجه به نسبت H/W و جهت گیری های متفاوت است.
روش بررسی: برای بررسی میزان تاثیرگذاری پوشش گیاهی در تنگه های شهری از نرم افزار Envi-met v4.1 استفاده شده است. با بررسی میدانی شرایط تنگه‌های شهری و پوشش‌های گیاهی پرتکرار در محیط مشخص شد، سپس با شبیه سازی کامپیوتری بهترین فرم پوشش گیاهی در تنگه‌های شهری اصفهان انتخاب و سطح تراکم و نوع آن را در فصل تابستان در تعدادی از تنگه‌های شهری اصفهان مورد بررسی قرارگرفته است.
یافته‌ها : نتایج به دست آمده از شبیه‌سازی‌ها مشخص شد که درخت در بین 5 الگوی پیشنهادی عملکرد مناسب تری از خود نشان می دهد و درخت در نسبت ارتفاع به عرض 1 در هر چهار جهت گیری بیشترین کاهش دما در فصل تابستان و در نسبت ارتفاع به عرض3 باعث ایجاد بهترین شرایط حرارتی شده‌است.
بحث و نتیجه‌گیری: نتایج تحقیق حاکی از ان است که در میان سناریو های مختلف الگوی درخت به تنهایی نسبت به الگوهای ترکیبی ان با چمن و بوته های کوتاه میزان تاثیر خنک کنندگی بیشتری دارد . این الگو در تمام نسبت ارتفاع به عرض ها و جهتگیری ها بهترین حالت را دارد .
المصادر:
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Byrne, L. Bruns, M. and Chung Kim, K. Ecosystem Properties of Urban Land Covers at the Above ground-Belowground Interface, 2008, Ecosystems, Vol. 11.
Fahmy, M. Sharples, S. and Yahiya, Y. LAI based trees selection for mid latitude urban developments: A microclimatic study in Cairo, Egypt, 2010, Building and Environment, Vol. 45. - pp. 345-357.
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Akbari, T. Urban climates and heat islands: albedo, evapotranspiration, and anthropogenic heat, 1997, Energy and Buildings, Vol. 25.
Georgi, JN. Dimitriou, D. The contribution of urban green spaces to the improvement of environment in cities: Case study of Chania, 2010, Greece, Vol. 45. - pp. 1401-1414.
Akbari, T et al. Peak power and cooling energy savings of shade trees, 1997, Energy and Buildings, Vol. 25. - pp. 139-48.
Ali-Toudert, F and Mayer H. Effects of asymmetry,galleries, overhanging façades and vegetation on thermal comfort in urban street canyons, 2007, SolEnergy, Vol. 81.
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A Optimizing the Effect of Vegetation for Pedestrian Thermal Comfort and Urban Heat Island Mitigation in a Hot Arid Urban Environment, 2014
Krüger, E. Pearlmutter, D. and Rasia, F. Evaluating the impact of canyon geometry and orientation on cooling loads in a high-mass building in a hot dry environment, 2010, Applied Energy, 6 : Vol. 87.
envi-met.com
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Wania A [et al.] Analysing the influence of different street vegetation on traffic-induced particle dispersion using microscale simulations. Environmental Management, 2012. - Vol. 94.
Perini, K. Magliocco, A. Effects of vegetation, urban density, building height, and atmospheric conditions on local temperatures and thermal comfort, 2014, Urban Forestry & Urban Greening, 3 : Vol. 13.
Leuzinger, S. Vogtb, R. and Körner, CH. Tree surface temperature in an urban environment, 2010, Agricultural and Forest Meteorology, 1 : Vol. 150.
Shahidan M [et al.] A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort Landscape and Urban Planning, 2010. - 3 : Vol. 97. - pp. 168-181.
_||_
Bourbia, F. Awbi, H.B. Building cluster and shading in urban canyon, 2004, Renewable Energy, Vol. 29. - pp. 291-301.
health and Climate change health and Climate change [Online] // the lancet. - 2009. - http://www.thelancet.com/series/health-and-climate-change.
Bourbia, F. Boucheriba, F. Impact of street design on urban microclimate for semi arid climate (Constantine), 2010, Renewable Energy, Vol. 35.
Oke, R.T et al. Simulation of surface urban heat islands under ‘ideal’ conditions at night part 2: Diagnosis of causation, 1991, Boundary-Layer Meteorology, 4 : Vol. 56.
Ahmad, A. Khare, M and Chaudhry, K.K. Wind tunnel simulation studies on dispersion at urban street canyons and intersections—a review, 2005, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 93. pp. 697-717.
Oke, R.T. Street design and urban canopy layer climate, 1988, Energy and Buildings, 1-3 : Vol. 11.
Johansson, E. Influence of urban geometry on outdoor thermal comfort in a hot dry climate, 2006, BuildEnviron, Vol. 41.
Lin, t. Matzarakis, A. and Hwang, RL. Shading effect on long-term outdoor thermal comfort, 2010, Building and Environment, Vol. 45
Jamei, E et al. Review on the impact of urban geometry and pedestrian level greening on outdoor thermal comfort, 2016, Renewable and Sustainable Energy Reviews, Vol. 54. - pp. 102-117.
Matzarakis, A. Rutz, F. and Mayer, H. Modelling radiation fluxes in simple and complex environments—application of the RayMan model, 2007, Int J Biometeorol,. - Vol. 51.
Abreu-Harbich, L.V. Labaki, L.C and Matzarakis, A. Thermal bioclimate in idealized urban street canyons in Campinas, Brazil, 2012, International Conference on Urban Climates, Vol. 8.
Herrmann, J. Matzarakis, A. Mean radiant temperature in idealised urban canyons—examples from Freiburg, Germany, 2012, Int J Biometeorol, Vol. 56.
Nunez, M. Oke, R.T. Energy balance of an urban Canyon . 1997
Gill, SE. et al. Adapting Cities for Climate Change: The Role of the Green Infrastructure, 2007, Built Environment, Vol. 33. - pp. 115-133.
Givoni, B. Impact of planted areas on urban environmental quality: A review, 1991, Atmospheric Environment. Part B. Urban Atmosphere, 3 : Vol. 25.
Grimmond, C.S.B. Oke, T.R. An evapotranspiration-interception model for urban areas, 1991, Water Resour. Res., Vol. 27.
Bonan, G.B. Effects of land use on the climate of the united states, 1997, National Center for Atmospheric Research, Vol. 37. - pp. 449-486.
Byrne, L. Bruns, M. and Chung Kim, K. Ecosystem Properties of Urban Land Covers at the Above ground-Belowground Interface, 2008, Ecosystems, Vol. 11.
Fahmy, M. Sharples, S. and Yahiya, Y. LAI based trees selection for mid latitude urban developments: A microclimatic study in Cairo, Egypt, 2010, Building and Environment, Vol. 45. - pp. 345-357.
Oliveira, S. Andrade, H. Vaz, T. The cooling effect of green spaces as a contribution to the mitigation of urban heat: A case study in Lisbon, 2011, Lisbon : Building and Environment, Vol. 46.
Akbari, T. Urban climates and heat islands: albedo, evapotranspiration, and anthropogenic heat, 1997, Energy and Buildings, Vol. 25.
Georgi, JN. Dimitriou, D. The contribution of urban green spaces to the improvement of environment in cities: Case study of Chania, 2010, Greece, Vol. 45. - pp. 1401-1414.
Akbari, T et al. Peak power and cooling energy savings of shade trees, 1997, Energy and Buildings, Vol. 25. - pp. 139-48.
Ali-Toudert, F and Mayer H. Effects of asymmetry,galleries, overhanging façades and vegetation on thermal comfort in urban street canyons, 2007, SolEnergy, Vol. 81.
Hien Wong, N. Yu, C. Study of green areas and urban heat island in a tropical city, 2005, Habitat International, Vol. 29. - pp. 547-558.
Sawka M [et al.] Growing summer energy conservation through residential tree planting . Landscape and Urban Planning, 2013. - Vol. 113. - pp. 1-9.
Vailshery L, Jaganmohan M and Nagendra H Effect of street trees on microclimate and air pollution in a tropical city . Urban Forestry & Urban Greening, 2013. - Vol. 12. - pp. 408-415.
Srivanit M and Hokao K Evaluating the cooling effects of greening for improving the outdoor thermal environment at an institutional campus in the summer Building and Environment, 2013. - Vol. 66. - pp. 158-172.
R. OF IRAN METEOROLOGICAL ORGANIZATION. http://www.esfahanmet.ir/
Huttner, S. Bruse, M. Numerical modeling of the urban climate, a preview on Envi-met 4.0, The seventh International Conference on Urban Climate. - Yokohama,Japan : [s.n.], 2009.
A Optimizing the Effect of Vegetation for Pedestrian Thermal Comfort and Urban Heat Island Mitigation in a Hot Arid Urban Environment, 2014
Krüger, E. Pearlmutter, D. and Rasia, F. Evaluating the impact of canyon geometry and orientation on cooling loads in a high-mass building in a hot dry environment, 2010, Applied Energy, 6 : Vol. 87.
envi-met.com
Patz, J.A. Campbell-Lendrum, D. Patz, J.A., Campbell-Lendrum, D., Impact of regional climate change on human health, 2005, Nature, Vol. 438. - pp. 310–317.
Wania A [et al.] Analysing the influence of different street vegetation on traffic-induced particle dispersion using microscale simulations. Environmental Management, 2012. - Vol. 94.
Perini, K. Magliocco, A. Effects of vegetation, urban density, building height, and atmospheric conditions on local temperatures and thermal comfort, 2014, Urban Forestry & Urban Greening, 3 : Vol. 13.
Leuzinger, S. Vogtb, R. and Körner, CH. Tree surface temperature in an urban environment, 2010, Agricultural and Forest Meteorology, 1 : Vol. 150.
Shahidan M [et al.] A comparison of Mesua ferrea L. and Hura crepitans L. for shade creation and radiation modification in improving thermal comfort Landscape and Urban Planning, 2010. - 3 : Vol. 97. - pp. 168-181.
