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Mitigating intensity of urban heat island by better understanding on urban morphology and anthropogenic heat dispersion

机译：通过对城市形态学和人为热分散的更好理解，城市热岛的缓解强度

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Anthropogenic heat is one of the key factors that causes intensive Urban Heat Island (UHI) due to its direct impact on ambient temperature in urban areas. Stagnated airflow due to closely packed tall buildings causes weak dilution and removal of anthmpogenic heat. Consequently, research is critically needed to investigate the effect of urban morphology on anthmpogenic heat dispersion and provide effective planning strategies to reduce UHI intensity, especially at the extreme scenarios, such as with very low wind speed and high heat emission. This study provides scientific understanding and develops a Geographic Information System (GIS)-based modelling tool to support decision-making in urban planning practice. We start from a computational parametric study at the neighbourhood scale to investigate the impact of urban morphology on heat dispersion. Site coverage ratio and frontal area density are two urban morphological parameters. Ten parametric cases with two heat emission scenarios are designed to study representative urban areas. Furthermore, based on the energy conservation within urban canopy layers, we develop a semi-empirical model to estimate spatially-averaged in-canopy air temperature increment, in which the exchange velocity between street canyons and overlaying atmosphere is estimated by the Bentham and Britter model. The performance of new model is validated by cross-comparing with Computational Fluid Dynamics (CFD) results from the parametric study. By applying this new model, the impact of anthmpogenic heat on air temperature is mapped in residential areas of Singapore for both long-term annually averaged and short-term extreme low wind speed to improve urban climate sustainability and resilience.
机译：人为热是由于其对城市地区环境温度的直接影响而导致强化城市热岛（UHI）的关键因素之一。由于紧密包装的高层建筑而停滞气流导致弱稀释和去除心性发热。因此，重视研究旨在探讨城市形态对高炎热分散性的影响，并提供有效的规划策略，以减少UHI强度，特别是在极端情况下，如风速非常低，热排放。本研究提供了科学的理解，并开发了基于地理信息系统（GIS）的建模工具，以支持城市规划实践中的决策。我们从邻里规模的计算参数研究开始，以研究城市形态对热分散的影响。现场覆盖率和正面区域密度是两种城市形态参数。具有两个热发射方案的十个参数案件旨在研究代表城市地区。此外，基于城市遮篷层内的节能，我们开发了一个半实证模型来估计空间平均内部空气温度增量，其中街道峡谷和覆盖气氛之间的交换速度由Bentham和布尔特模型估算。通过与参数研究的计算流体动力学（CFD）的交叉比较来验证新模型的性能。通过应用这一新模型，在新加坡的住宅区对长期平均和短期极端低风速映射到空气温度对空气温度的影响，以提高城市气候可持续性和弹性。

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