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Urban heat islands: Potential effect of organic and structured urban configurations on temperature variations in Dubai, UAE

机译：城市热岛：有机和结构化的城市布局对阿联酋迪拜温度变化的潜在影响

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Urban heat islands are phenomena that occur coupled with rapid urban developments. The study was carried out to show the effect of organic and structured urban configurations on temperature variations throughout the year, especially in summer. The study investigated a larger area of the city rather than merely building-to-building relationships. It went beyond the confinement of street and building geometries and investigated how a number of these geometries put together in one context contributed to temperature variations. Computer simulation software was used to simulate three different urban configurations, representing an organic configuration in the Bastakiyah model and two structured configurations represented in the Orthogonal and Volume Ortho configurations. The simulations were carried out in Dubai, UAE for summer, winter, and autumn with fixed initial input temperature value of 32 ℃ and varying initial wind speeds (0.1 m/s and 3.6 m/s; and 7 m/s for summer case only). Assessment of the results showed that the organic configuration recorded lower temperatures in summer than both the structured configurations. The Orthogonal structured configuration did not behave as an intermediate configuration between the organic and highly structured grid configurations. The Volume Ortho configuration, though recorded the highest wind speeds, did not result in lower temperature values. It was shown that different configurations manipulated the behavior of the wind within the configuration. The sky-view factor and standard deviation were plausible explanations in the absence of obvious trends in some cases, and showed how urban configurations impacted temperature variations. It was concluded that, given this specific site location and the alignment of prevailing winds parallel to the roads, the organic configuration showed the better thermal performance amongst the three configurations.
机译：城市热岛是伴随城市快速发展而发生的现象。进行了这项研究以显示有机和结构化的城市布局对全年（尤其是夏季）温度变化的影响。该研究调查了城市的更大区域，而不仅仅是建筑与建筑之间的关系。它超出了街道和建筑物几何形状的范围，并研究了在一个环境中将这些几何形状组合在一起如何导致温度变化。使用计算机模拟软件来模拟三种不同的城市配置，分别代表Bastakiyah模型中的有机配置和代表正交和体积正交配置中的两种结构化配置。在夏天，冬天和秋天在阿联酋迪拜进行了模拟，初始输入温度固定为32℃，初始风速变化（分别为0.1 m / s和3.6 m / s；仅在夏季情况下为7 m / s） ）。结果评估表明，有机构型在夏季记录的温度低于两种结构构型。正交结构化配置不充当有机结构和高度结构化网格配置之间的中间配置。 “体积正交”配置尽管记录了最高风速，但并未导致温度值降低。结果表明，不同的配置在配置内操纵了风的行为。在某些情况下没有明显趋势的情况下，天空因素和标准偏差是合理的解释，并显示了城市布局如何影响温度变化。得出的结论是，考虑到这种特定的工地位置和盛行风平行于道路的排列，有机构型在三种构型中显示出更好的热性能。

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