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LAI based trees selection for mid latitude urban developments: A microclimatic study in Cairo, Egypt

机译：基于LAI的中纬度城市发展树木的选择：埃及开罗的小气候研究

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摘要

To study the leaf area index, LAI, based thermal performance in distinguishing trees for Cairo's urban developments, ENVI-met plants database was used as platform for a foliage modeling parameter, the leaf area density, LAD. Two Egyptian trees; Ficus elastica, and Peltophorum pterocarpum were simulated in 2 urban sites with one having no trees, whilst the second is having Ficus nitida trees. Trees LAD values were calculated using flat leaves' trees LAI definition to produce maximum ground solid shadow at peak time. An empirical value of 1 for LAI is applied to numerically introduce LAD values for ENVI-metrnBasically, different meteorological records showed improvements for pedestrian comfort and ambient microclimate of the building using F. elastica. About 40-50% interception of direct radiation, reductions in surfaces' fluxes around trees and in radiant temperature T_(mrt) in comparison to base cases gave prefer-ability to F. elastica. The lack of soil water prevented evapotranspiration to take place effectively and the reduced wind speeds concluded negligible air temperature differences from both base cases except slightly appeared with the F. elastica. Results show that a flat leaves tree if does not validate LAI of 1, the ground shading would not fulfill about 50% direct radiation interception and this value can be used as a reference for urban trees selection.rnFurther simulations were held to investigate LAI value of maximum direct radiation interception.rnPerforming additional simulations, F. elastica of LAI of 3 intercepted almost 84% of direct radiation and revealed implications about urban trees in practice and its actual LAI.
机译：为了研究叶面积指数，LAI，基于开罗城市发展中树木辨别的热性能，使用ENVI-met植物数据库作为叶建模参数，叶面积密度LAD的平台。两棵埃及树；在两个城市地点模拟了无花果榕和翼果蕨，其中一个没有树木，第二个有无花榕树。使用平叶树木的LAI定义计算树木的LAD值，以在峰值时间产生最大的地面实心阴影。 LAI的经验值为1，以数值方式引入ENVI-meta的LAD值。基本上，不同的气象记录显示，使用F. elastica可以改善建筑物的行人舒适度和周围微气候。与基本情况相比，大约40-50％的直接辐射截获，树木周围的表面通量减少以及辐射温度T_（mrt）降低了F. elastica的耐受性。土壤水的缺乏阻止了有效的蒸散，风速的降低表明两种基本情况的空气温度差异都可以忽略不计，除了弹性镰刀菌略有出现。结果表明，如果没有对LAI进行1验证，则平坦的叶子树无法满足约50％的直接辐射拦截效果，该值可以用作城市树木选择的参考。最大的直接辐射拦截。rn通过执行附加模拟，LAI的F.弹性体3拦截了几乎84％的直接辐射，并揭示了在实践中对城市树木及其实际LAI的影响。

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  • 来源
    《Building and Environment》 |2010年第2期|345-357|共13页
  • 作者

    Mohamad Fahmy; Stephen Sharpies; Mahmoud Yahiya;

  • 作者单位

    School of Architecture, University of Sheffield, Sheffield, UK Department of Architecture, Military Technical College, Cairo, Egypt;

    School of Architecture, University of Sheffield, Sheffield, UK;

    Department of Mechanical Engineering, University of Sheffield, Sheffield, UK Mechanical Engineering Branch, Military Technical College, Cairo, Egypt;

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

    LAI; LAD; peak time; ENVI-met;

    机译：赖;小伙子;高峰时段;环境;

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