Urban heat island effect of a polynuclear megacity Delhi Compactness and thermal evaluation of four sub-cities

Budhiraja, Bakul, Agrawal, Girish and Pathak, Prasad (2020) Urban heat island effect of a polynuclear megacity Delhi Compactness and thermal evaluation of four sub-cities. Urban Climate, 32: 100634. ISSN 22120955

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Planning for sustainable cities generally focuses on compact, human-scale cities. The urban paradigms underlying each city produce morphologies which generate a distinctive local urban climate. In this paper, four sub-cities in Delhi NCR, India, are classified using local climate zone (LCZ), and then analysed for thermal performance and compactness. These sub-cities are broadly classified as a garden city (LCZ 5A), a resettlement colony (LCZ 3), a mixed land-use city (LCZ 5), and an industrial city (LCZ 56). The surface UHI (UHISurf) is estimated using Google Earth Engine with MODIS, canopy layer UHI (UHIUCL) with meteorological data, and density using Spacematrix. The nighttime UHIUCL is 7.52 °C (LCZ 5 and LCZ 5A) and the UHISurf is 5.2 °C (LCZ 5 and LCZ D). A major apprehension is the residual temperature at sunrise (5–8 °C) leading to high heat stress and detrimental health impacts. The heating and cooling rate, reduced by a factor of three is observed (LCZ 5–0.25 °C/h). The least UHI is experienced by LCZ 5A and the built density is highest in LCZ 3. The mixed-land use (LCZ 5) city performs poorly, whereas the industrial city (LCZ 56) performs optimally on both thermal and density scales.

Item Type: Article
Keywords: Urban Heat Island | Urban Density | Delhi NCR | Local Climate Zones | Urban Planning Theories
Subjects: Physical, Life and Health Sciences > Arts and Architecture
JGU School/Centre: Jindal School of Art & Architecture
Depositing User: Amees Mohammad
Date Deposited: 22 Dec 2021 11:36
Last Modified: 13 Jan 2022 06:43
Official URL: https://doi.org/10.1016/j.uclim.2020.100634
URI: https://pure.jgu.edu.in/id/eprint/337


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