Urban vegetation as a climate change adaptation measure of moroccan cities: A case study

Ouali Kaoutar; Rachida Idchabani

doi:10.22712/susb.20240006

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2024 Vol.15, Issue 1 Preview Page Next Page

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Urban vegetation as a climate change adaptation measure of moroccan cities: A case study

31 March 2024. pp. 68-81

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Abstract

Outdoor thermal comfort is crucial for human health. This case study aims to explore the impact of urban vegetation on outdoor thermal comfort, notably the urban agriculture areas. Four scenarios were evaluated during a summer day in the sub-humid climate of Rabat, the urban forest Ibn Sina (ZA), the public park Hassan II (ZB), an urban agriculture area in the Bouregreg Valley (ZC), and part of the Souissi district characterised by abundance of private gardens and presence of trees in the streets (ZD). The study is a correlation between qualitative analysis based on morphological indicators and 3D numerical simulation using ENVI-met 4.4.2 validated experimentally. Hourly spatial mean values of 2m air temperature, surface temperature, relative humidity, wind speed, Mean Radiant Temperature and Predicted Mean Vote are analyzed. The comparison shows that even with a vegetation percentage of almost 50%, ZD records air temperatures much higher than the fully vegetated areas. This difference reaches 3.5°C at 7 h. The main results are that ZB and ZC record comparable PMV levels and private gardens or tree alignment in streets cannot compensate for the advection refreshment effect of an urban forest, a public park or a preserved UA area in the city.

Keywords

outdoor thermal comfort

urban agriculture

sub-humid climate

ENVI-met

vegetation scenarios

References

Deutsche Gesellschaft für and Internationale Zusammenarbeit (GIZ) GmbH, Sector Project Sustainable Economic Development, GIZ [Online], 2022. Available at: https://www.climate-expert. org/en/home/business-adaptation/morocco [Accessed 28/03/2024].

S. Teshnehdel, H. Akbari, E. Di Giuseppe, and R. D. Brown, Effect of tree cover and tree species on microclimate and pedestrian comfort in a residential district in Iran. Build. Environ. 178 (2020), p. 106899. DOI: 10.1016/j.buildenv.2020.106899. 10.1016/j.buildenv.2020.106899

X. Li and W. Zhou, Optimizing urban greenspace spatial pattern to mitigate urban heat island effects: Extending understanding from local to the city scale. Urban For. Urban Green. 41 (2019), pp. 255-263. DOI: 10.1016/j.ufug.2019.04.008. 10.1016/j.ufug.2019.04.008

T.E. Morakinyo and Y.F. Lam, 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 (2016), pp. 262-275. DOI: 10.1016/j.buildenv.2016.04.025. 10.1016/j.buildenv.2016.04.025

S. Coccolo, D. Pearlmutter, J. Kaempf, and J.-L. Scartezzini, Thermal Comfort Maps to estimate the impact of urban greening on the outdoor human comfort. Urban For. Urban Green. 35 (2018), pp. 91-105. DOI: 10.1016/j.ufug.2018.08.007. 10.1016/j.ufug.2018.08.007

P.W. Tien, M. Mohammadi, and J.K. Calautit, Providing Comfortable Environment in Skygardens Within High-Rise Buildings: Analysis of the Impact of Vegetation on Wind and Thermal Comfort. J. Sustain. Dev. Energy Water Environ. Syst. 9(2) (2021), pp. 1-28. DOI: 10.13044/j.sdewes.d8.0353. 10.13044/j.sdewes.d8.0353

S.H. Van Der Meulen, Costs and Benefits of Green Roof Types for Cities and Building Owners. J. Sustain. Dev. Energy Water Environ. Syst. 7(1) (2019), pp. 57-71. DOI: 10.13044/j.sdewes.d6.0225. 10.13044/j.sdewes.d6.0225

R. Taherkhani, S. Shaahnazari, N. Hashempour, and F. Taherkhani, Sustainable cities through the right selection of vegetation types for green roofs. Int. J. Sustain. Build. Technol. Urban Dev. 13(3) (2022), pp. 365-388. DOI: 10.22712/SUSB.20220027.

G. Thomas, J. Thomas, G.M. Mathews, S.P. Alexander, and J. Jose, Assessment of the potential of green wall on modification of local urban microclimate in humid tropical climate using ENVI-met model. Ecol. Eng. 187 (2023), p. 106868. DOI: 10.1016/j.ecoleng.2022.106868. 10.1016/j.ecoleng.2022.106868

C.S. De Munck, A. Lemonsu, R. Bouzouidja, V. Masson, and R. Claverie, The Greenroof module (v7.3) for modelling green roof hydrological and energetic performances within TEB. Geosci. Model Dev. 6(6) (2013), pp. 1941-1960. DOI: 10.5194/gmd-6-1941-2013. 10.5194/gmd-6-1941-2013

S. Saumya and K. Rashmi, Analysis of land cover change and urban heat islands of Lucknow, India. Int. J. Sustain. Build. Technol. Urban Dev. 14(2) (2023), pp. 215-228. DOI: 10.22712/SUSB.20230017.

C. Yu and W.N. Hien, Thermal benefits of city parks. Energy Build. 38(2) (2006), pp. 105-120. DOI: 10.1016/j.enbuild.2005.04.003. 10.1016/j.enbuild.2005.04.003

E.G. Ibrahim, I. Berni, A. Menouni, M. Amane, M. Kestemont, and S. el Jaafari, Evaluation of the Sustainability of Urban Vegetable Farms in the City of Meknes (Morocco). European Scientific Journal. 17(40) (2021), p. 121. 10.19044/esj.2021.v17n40p121

J. Langemeyer, C. Madrid-Lopez, A. Mendoza Beltran, and G. Villalba Mendez, Urban agriculture - A necessary pathway towards urban resilience and global sustainability?. Landsc. Urban Plan. 210 (2021), p. 104055. DOI: 10.1016/j.landurbplan. 2021.104055. 10.1016/j.landurbplan.2021.104055

P. Dugue, A. Benabed, E.H. Abdellaoui, and E. Valette, Urban agriculture in Meknes (Morocco) at the crossroads: disappearance of marginalized agriculture or return of the garden city?. Alternatives Rurales. (3) (2015), p. 14.

K. Ouali, K. El Harrouni, M.L. Abidi, and Y. Diab, The Urban Heat Island phenomenon modelling and analysis as an adaptation of Maghreb cities to climate change. MATEC Web Conf. 149 (2018), p. 02090. DOI: 10.1051/matecconf/201814902090. 10.1051/matecconf/201814902090

Parisian Urban Planning Workshop and Urban Agency of Rabat Sale, Synthesis of the sectoral thematic diagnostic analysis, Unified development plan of the city of Rabat. Jan., 2010.

Wilaya of Rabat -Sale -Zemmour -Zaer Urban Agency of Rabat Sale, Reflections on the charter of green spaces and proposal of action plan. Dec., 2010.

M.T. Daramola and I.A. Balogun, Analysis of the urban surface thermal condition based on sky-view factor and vegetation cover. Remote Sens. Appl. Soc. Environ. 15 (2019), p. 100253. DOI: 10.1016/j.rsase.2019.100253. 10.1016/j.rsase.2019.100253

L. Doulos, M. Santamouris, and I. Livada, Passive cooling of outdoor urban spaces. The role of materials. Sol. Energy. 77(2) (2004), pp. 231-249. DOI: 10.1016/j.solener.2004.04.005. 10.1016/j.solener.2004.04.005

M. Bruse, The Influences of Local Environmental Design on Microclimate-Development of a Prognostic Numerical Model ENVI-Met for the Simulation of Wind, Temperature, and Humidity Distribution in Urban Structures. University of Bochum, Germany, 1999.

C. Jacobs, Direct impact of atmospheric CO2 enrichment on regional transpiration. PhD thesis, Wageningen Agricultural University. Wageningen Agricultural University, Utrecht, Netherlands, 1994.

C. Piselli, V.L. Castaldo, I. Pigliautile, A.L. Pisello, and F. Cotana, Outdoor comfort conditions in urban areas: On citizens' perspective about microclimate mitigation of urban transit areas. Sustain. Cities Soc. 39 (2018), pp. 16-36. DOI: 10.1016/j.scs.2018.02.004. 10.1016/j.scs.2018.02.004

J.A. Acero and J. Arrizabalaga, Evaluating the performance of ENVI-met model in diurnal cycles for different meteorological conditions. Theor. Appl. Climatol. 131(1-2) (2018), pp. 455-469. DOI: 10.1007/s00704-016-1971-y. 10.1007/s00704-016-1971-y

E. Johansson, Influence of urban geometry on outdoor thermal comfort in a hot dry climate: A study in Fez, Morocco. Build. Environ. 41(10) (2006), pp. 1326-1338. DOI: 10.1016/j.buildenv.2005.05.022. 10.1016/j.buildenv.2005.05.022

K. Ouali, Assessment of the mixed local climate zones as the best design for future eco-districts in sub-humid climate: A case of rabat. Int. J. Sustain. Build. Technol. Urban Dev. 14(1) (2023), pp. 3-17. DOI: 10.22712/SUSB.20230002.

Geoportal of Urban Agency of Rabat and Sale [Online], 2020. Available at: https://geoportail.aurs. org.ma/. [Accessed 28/03/2024].

J. Fu, K. Dupre, S. Tavares, D. King, and Z. Banhalmi-Zakar, Optimized greenery configuration to mitigate urban heat: A decade systematic review. Front. Archit. Res. 11(3) (2022), pp. 466-491. DOI: 10.1016/j.foar.2021.12.005. 10.1016/j.foar.2021.12.005

K. Athamena, Modélisation et simulation des microclimats urbains: Étude de l'impact de la morphologie urbaine sur le confort dans les espaces extérieurs. Cas des éco-quartiers. Ecole Centrale De Nantes Ecole Doctorale: Science Pour L'Ingenieur, Geosciences, Architecture, France, 2012.

F. Ali-Toudert and H. Mayer, Numerical study on the effects of aspect ratio and orientation of an urban street canyon on outdoor thermal comfort in hot and dry climate. Build. Environ. 41(2) (2006), pp. 94-108. DOI: 10.1016/j.buildenv.2005.01.013. 10.1016/j.buildenv.2005.01.013

Information

Publisher :Sustainable Building Research Center (ERC) Innovative Durable Building and Infrastructure Research Center
Publisher(Ko) :건설구조물 내구성혁신 연구센터
Journal Title :International Journal of Sustainable Building Technology and Urban Development
Volume : 15
No :1
Pages :68-81
Received Date : 2023-12-06
Accepted Date : 2024-03-26
DOI :https://doi.org/10.22712/susb.20240006

International Journal of Sustainable Building Technology and Urban Development ISSN:2093-761X(Print) 2093-7628(Online)

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