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Urban heat island effect of a polynuclear megacity Delhi – Compactness and thermal evaluation of four sub-cities
Urban Climate ( IF 6.0 ) Pub Date : 2020-05-11 , DOI: 10.1016/j.uclim.2020.100634
Bakul Budhiraja , Girish Agrawal , Prasad Pathak

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.



中文翻译:

多核大城市德里的城市热岛效应–四个子城市的紧凑性和热力评估

可持续城市的规划通常侧重于紧凑的人性化城市。每个城市下面的城市范式产生的形态会产生独特的当地城市气候。在本文中,使用当地气候带(LCZ)对印度德里NCR的四个子城市进行了分类,然后对其热性能和紧凑性进行了分析。这些子城市大致分为花园城市(LCZ 5 A),安置区(LCZ 3),混合土地利用城市(LCZ 5)和工业城市(LCZ 5 6)。使用带有MODIS的Google Earth引擎,带有气象数据的冠层UHI(UHI UCL)和使用Spacematrix的密度来估计表面UHI(UHI Surf)。夜间UHI UCL温度为7.52°C(LCZ 5和LCZ 5 A),UHI Surf为5.2°C(LCZ 5和LCZ D)。一个主要的忧虑是日出时的残留温度(5–8°C)会导致较高的热应力和对健康的不利影响。观察到加热和冷却速率降低了三倍(LCZ 5–0.25°C / h)。LCZ 5 A经历的UHI最少,LCZ 3中的建筑密度最高。混合土地利用(LCZ 5)城市的表现不佳,而工业城市(LCZ 5 6)在热度和密度方面均表现最佳。

更新日期:2020-05-11
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