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A study on the impact of shadow-cast and tree species on in-canyon and neighborhood's thermal comfort

机译：影子树种对峡谷内及邻里热舒适性影响的研究

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摘要

Tree-planting is one of the veritable tools for combating urban heat island and improving thermal comfort in the wake of global warming and urbanization. However, trees of different species and morphological properties have variable solar attenuation capacity and consequently, thermal comfort regulation potential. Besides, the shadow-cast effect by buildings helps in reducing pedestrian radiant load and consequently improves thermal comfort especially in high-density cities even though ventilation is reduced. Therefore, a holistic and contextual understanding of tree-planting and shadow-casting can help in designing climate-proof cities. In this study, we employed the ENVI-met model to better understand the interaction between these two forms of shading (trees and buildings) on the pedestrians' thermal comfort in Hong Kong and the influence of one over the other. The impact of different urban densities on the thermal comfort improvement potential by eight (8) common tree-species in Hong Kong was specifically studied. Results show that shallow canyons are susceptible to worse thermal condition when compared to their deeper counterparts with similar aspect ratio value. Of all tree configuration parameters, leaf area index, tree height and trunk height are most influential in improving and aggravating daytime and nighttime thermal comfort, respectively. We also found that trees' effectiveness in improving daytime thermal comfort reduces with increasing urban density and vice-versa for nighttime. For the reference of planners and landscape architects, this study recommends tall trees of low canopy density with high trunk in deeper canyons and vice-versa for shallow Canyons and open-areas. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在全球变暖和城市化之后，植树是对抗城市热岛和改善热舒适性的真正工具之一。但是，不同树种和形态特性的树木具有可变的日光衰减能力，因此具有调节热舒适性的潜力。此外，建筑物的遮蔽效应有助于减少行人的辐射负荷，因此即使减少了通风，尤其是在高密度城市中，仍可改善热舒适性。因此，对植树和遮荫的整体和背景了解可以帮助设计耐气候城市。在这项研究中，我们使用ENVI-met模型来更好地理解这两种形式的阴影（树木和建筑物）之间的相互作用对香港行人的热舒适性以及两者之间的影响。专门研究了不同城市密度对香港八（8）种常见树种改善热舒适性的影响。结果表明，与纵横比值相似的深峡谷相比，浅峡谷更容易受到热条件的影响。在所有树木配置参数中，叶面积指数，树木高度和树干高度分别对改善和加剧白天和夜间的热舒适性有最大影响。我们还发现，树木在提高白天热舒适性方面的有效性会随着城市密度的提高而降低，反之亦然。供规划人员和景观设计师参考，本研究建议在较深的峡谷中采用低冠层高树干的高大树木，对于浅峡谷和开阔地带则建议相反。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Building and Environment》 |2017年第4期|1-17|共17页
  • 作者

    Morakinyo Tobi Eniolu; Kong Ling; Lau Kevin Ka-Lun; Yuan Chao; Ng Edward;

  • 作者单位

    Chinese Univ Hong Kong, Inst Future Cities, Hong Kong, Hong Kong, Peoples R China;

    Chinese Univ Hong Kong, Sch Architecture, Hong Kong, Hong Kong, Peoples R China|Chinese Univ Hong Kong, Fac Med, Hong Hom, Hong Kong, Peoples R China;

    Chinese Univ Hong Kong, Inst Environm Energy & Sustainabil, Hong Kong, Hong Kong, Peoples R China;

    Natl Univ Singapore, Sch Design & Environm, Dept Architecture, Singapore, Singapore;

    Chinese Univ Hong Kong, Inst Future Cities, Hong Kong, Hong Kong, Peoples R China|Chinese Univ Hong Kong, Sch Architecture, Hong Kong, Hong Kong, Peoples R China|Chinese Univ Hong Kong, Inst Environm Energy & Sustainabil, Hong Kong, Hong Kong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ENVI-met; Thermal comfort; Tree-planting; Tree species; Street-canyon; Urban densities;

    机译：ENVI-met;热舒适度;植树;树木种类;街道峡谷;城市密度;

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