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Evaluating the scenario of urban blue-green space in Tezpur town of Assam using geo-technical approach

Hazarika Archita, Saikia Jyoti, Saikia Sailajananda

Acta Geophysica

2025

Vol. 73, no. 1

901--915

Urban blue-green space (UBGS) is considered to be an effective way to mitigate Urban Heat Island (UHI) effects. UBGS not only cools the actual space but also influences the surrounding areas; this phenomenon is termed as UBGS cooling effect. The present study tries to anatomize the UBGS of urban Tezpur with the help of geo-technology. Landsat satellite images of Thematic Mapper (TM) and Operational Land Imager (OLI) with 30 m spatial resolution were used to investigate the UBGS scenario for the years 1993 and 2023, respectively. Land Surface Temperature (LST), Normalized Difference Vegetation Index (NDVI), and Normalized Difference Water Index (NDWI) were taken into consideration for the ascertainment of UBGS and UHI. The correlation between LST and NDVI was also determined with the aid of simple regression analysis. The NDVI values for the years 1993 and 2023 are - 0.32 to 0.70 and - 0.44 to 0.50 respectively. The LST values of the town for the year 1993 are 28.76 to 20.17 and for 2023, the LST value is 29.47 to 20.36. The NDWI value indicates that the water index increased in the water bodies from the year 1993 to 2023. Though sufficient data are not available on the website, the data used in the study are free from major environmental and geometric disturbances to establish the LST, NDVI, and NDWI. However, the present work is the pioneer that used geo-spatial technology which will also help the urban planners and designers to deal with UBGS and UHI effects.

Wpływ niebieskiej infrastruktury na kształtowanie niebieskiej przestrzeni miejskiej

Breś Justyna

Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN

2019

No. 276

43--55

Blue infrastructure is not only an element related to rainwater retention in a city but also a factor shaping urban space. As a result of the impact of blue infrastructure on form, function and character of urban space, a unique space is created – an urban blue space. The subject of the article is associated with the blue infrastructure on shape and character of urban spaces, as well as water-land spatial relations within urban blue space. Author of the article analised spatial relations occurring in port cities between aquatic and terrestrial space from perspective of the land, but also water, which is an equally important part of city’s area. As a result models of two-dimensional water-land relations have been recognised and described.