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Wind and Heat Environment in Densely Built Urban Areas in Hong Kong

机译:香港密集市区的风热环境

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摘要

Global environmental changes, especially global warming, are becoming an issue for urban designers. Coupled with that are the issues of life in mega- and high-density cities and the urban heat island effect. Hong Kong is one of the world's highest-density cities, with over sixty thousand persons per square kilometre in its urban areas. High-rise, bulky and closely packed buildings are the norm; and this increases the urban heat island intensity and reduces urban air ventilation. Given Hong Kong's hot, humid tropical summers, high heat stress can be expected in the urban environment. Since 2003, the Hong Kong Government has commissioned studies on this issue. An air ventilation assessment (AVA) study was carried out. In addition, an urban climatic map was drafted based on an evaluation of human thermal comfort. A study of intra-urban temperature variations is underway and their possible implications to localised hot days and hot spells is being investigated. The criticality of rising intra-urban temperature and decreased wind speed can be established. This has provided objective input for planning actions in the form of urban climatic recommendation maps. This work is on-going in Hong Kong. The present paper summarises some of these projects and documents the study process and rationale.
机译:全球环境变化,尤其是全球变暖,已成为城市设计师关注的问题。随之而来的是大密度和高密度城市中的生活问题以及城市热岛效应。香港是世界上密度最高的城市之一,其市区每平方公里有六万多人。高层,大体积和密排建筑是常态;这会增加城市的热岛强度,并减少城市的空气流通。鉴于香港炎热潮湿的夏季,在城市环境中预计会有高温。自2003年以来,香港政府已委托对此问题进行研究。进行了空气通风评估(AVA)研究。此外,根据对人类热舒适性的评估,绘制了城市气候图。正在进行城市内部温度变化的研究,并且正在研究它们对局部炎热天气和炎热天气的潜在影响。可以确定城市内部温度升高和风速降低的关键。这以城市气候推荐图的形式为规划行动提供了客观的投入。这项工作正在香港进行。本文总结了其中一些项目,并记录了研究过程和基本原理。

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