Analysis of The Effect of Urban Green Spaces Reduction on Surface Temperature and Relative Humidity Changes (Case study of Rasht City)

Subject Areas : Natural geography and human settlements

Ruhollah  Oji ¹ (University of Guilan)
Esmaeil  Aghaeizadeh ² (Department of Geography and urban planning-University of Guilan)
Mehrnush  Mirabimoghadam ³ (University of Guilan)

Received: 2018-10-26 Accepted : 2020-03-16 Published : 2021-01-20

Keywords: Relative humidity, urban green space, Extreme temperature, Rasht,

Abstract :

Nowadays, cities are facing with increasing the urban heat island and reduction of the climate comfort Due to the urbanization and the reduction of urban green spaces. This research, therefore, aims to investigate green space reduction and its effects on relative humidity and temperature variability in Rasht, Iran during the period of 1964-2013. To do this, Landsat imagery, daily temperature extremes and relative humidity of the Rasht synoptic station were used. To measure the changes, NDVI, extreme temperature indices and Sen's slope estimator were applied. Results showed that the total green space in Rasht has fallen from about 7,255 hectares to 5,990 hectares and high density green space has dropped from 2855 hectares to 788 hectares. Also, DTR, ID, TN10p indices have been reduced with a 99% confidence. Whereas the indices of TR, TXx as well as TX90p with a confidence of 99%, and maximum relative humidity of Rasht with 95% confidence intervals are increased. Also, trends of the climate parameters are consistent with the green space reduction, and their trends have intensified over three consecutive decades. So that with the population doubling, the city's green space is reduced to about a third of the initial value and the indices such as DTR and FD decreased by about 4 ° C and 35 days, respectively. It seems that the increase of green space is necessary to reduce the effects of the urban heat island and the global warming for sustainable development. It should be taken into consideration in future planning.

References:

Aadashi Roudbari, A., Aliabadi, K. (2017). The Role of Geographic Components on the Temperature Dispersion at Urban Area Using Remote Sensing Techniques Case Study of Mashhad City. Geographical Planning of Space, 7(24), 131-142.

Aghili Nasab, S.Z., Mohammadzade M., Salman Mahini A.R., and Zarei H. (1391). Green space location in the control and improvement of urban climate change. Second Conference on Environmental Planning and Management.

Alavipanah, S., Hashemi Darrehbadami, S., Kazemzadeh, A. (2015). Spatial- Temporal Analysis of Urban Heat- Island of Mashhad City due to Land Use/ Cover Change and Expansion. Geographical Urban Planning Research (GUPR), 3(1), 1-17. doi: 10.22059/jurbangeo.2015.54436

Ataei, H., and Fanaei, R. (2014). The Survey of Series temperature changes trend at the city of Shiraz in relation to urban development planning. , 4(15), 57-76.

Choudhury, M. R., and Das, S. (2016). Potential Role of Landsat Satellite Data for the Evaluation of Land Surface Temperature and Assessment of Urban Environment. National Institute of Urban Affairs (NIUA). Environment and Urbanization Asia. SAGE Publications. 7(1) 55–75.  DOI: 10.1177/0975425315619721

Doick, K., and Hutchings, T. (2013). Air temperature regulation by urban trees and green infrastructure. Research Note. Forest Research. ISBN: 978-0-85538-878-2

Esmailpour, N. And Azizpour, M. (2009). Change of agricultural land use and relative increase of temperature in Yazd due to its rapid growth. Geography and Regional Development. 7(12), 54-37.

Grover, A., and Singh, R.B. (2016). Monitoring Spatial Patterns of Land Surface Temperature and Urban Heat Island for Sustainable Megacity: A Case Study of Mumbai, India, Using Landsat TM Data. National Institute of Urban Affairs (NIUA). Environment and Urbanization Asia. SAGE Publications. 7(1) 38–54. DOI: 10.1177/0975425315619722

Kavosh Consulting Engineers. (2007). Master Plan of Rasht City. Department of Housing and Urban Development of Guilan Province. 2.

Liu, L., and Zhang, Y. (2011). Urban heat island analysis using the Landsat TM data and ASTER data: A case study in Hong Kong. Remote Sensing, 3(7), 1535-1552.

Mirabimoghadam, M. (2017). Measurement of green space of residential complex with emphasis on urban landscape ecology approach (Case study: Rasht city)., Aghaeizadeh E., University of Guilan, Guilan, Iran.

 Pohlert, T. (2018). Trend: Non-Parametric Trend Tests and Change-Point Detection. R package version 1.1.0.  https://CRAN.R-project.org/package=trend

Rezaei, P. And Abed, H. (2010). Investigation of minimum temperature trend of Rasht synoptic station with emphasis on freezing period. Geography and environmental studies. 2, 48-39.

Saadatabadi, A.R., And Azadi, M. (2005). Study of changes in temperature and wind fields in Tehran Megapolis due to Urbanization. Geographical Researches Quarterly Journal. 20(1), 188-171.

Shams, Sh., and Mousavi Baygi, M. 1393. The Investigation of Mashhad Extremum Temperature in Different Scales. Journal of Water and Soil. 28(1), 60-46.

Sobrinoa, J., A.; Jime´nez-Mun˜oza, J., C.; Paolini, L. (2004). Land surface temperature retrieval from LANDSAT TM 5. Remote Sensing of Environment 90. 434 – 440. doi:10.1016/j.rse.2004.02.003

World Bank. (2010). Cities and Climate Change: An Urgent Agenda. Urban development series. Knowledge papers no. 10. Washington, DC. © World Bank. https://openknowledge.worldbank.org/handle/10986/17381 License: CC BY 3.0 IGO.

Xu, H.; Chen, Y.; Dan, S.; and Qiu, W. (2011). Spatial and temporal analysis of urban heat Island effects in Chengdu City by remote sensing. In Geoinformatics, 19th International Conference on (pp. 1-5). IEEE.

Yang, C.; He, X.; Wang, R.; Yan, F.; Yu, L.; Bu, K.; Yang, J.; Chang, L.; and Zhang, S. (2017). The Effect of Urban Green Spaces on the Urban Thermal Environment and Its Seasonal Variations. Forests. 8, 153. doi:10.3390/f8050153

Zhang, Z.; Alexander, L.; Hegerl, G.C.; Jones, P.; Tank, A.K.; Peterson, T.C.; Trewin, B.; and Zwiers., F.W. (2011). Indices for monitoring changes in extremes based on daily temperature and precipitation data. WIREs Clim Change. doi: 10.1002/wcc.147

Zohrabi, N., Massah Bavani, A., Goodarzi, E., Heidarnejad, M. (2016) Identify Trend in the Annual Temperature and Precipitation in Karkheh River Basin. Wetland Ecobiology. 8 (2), 5-22.