Quantifying the impact of vertical greenery systems (VGS) on Mediterranean urban microclimate during heat wave events

IF 7.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Building and Environment Pub Date : 2024-10-02 DOI:10.1016/j.buildenv.2024.112151

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Abstract

This research investigates the potential of vertical greenery systems (VGS) to modulate the outdoor microclimate in a real-scale Mediterranean climate street canyon with respect to a non-vegetated control during four heat waves and summer conditions. The cooling effect of VGS on air temperature was assessed using an identical set of sensors in both canyons. The effect on thermal comfort was evaluated using radiation fluxes, Mr.T tool, and the ENVI-met model that was validated against measured data.

The VGS cooling effect during the heat waves was up to 0.36–2.04°C, and its duration was significantly extended. The correlation (R² = 0.75) between the cooling effect, relative humidity, and wind direction, highlights that warmer and drier conditions increase the VGS cooling effect during heat waves.

VGS improved the mean radiant temperature (T_mrt) above the canyon (3.9–4.1°C) and at the pedestrian level (2.21–2.8°C), while the physiological equivalent temperature (PET) and universal thermal climate index (UTCI) decreased by an average of 0.67–1.07 °C and 0.63–0.8 °C, respectively. Shaded walls improved the average T_mrt (11.7°C), PET (3.2°C), and UTCI (2.7°C), reflecting the importance of casting shadow in the urban environment.

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量化垂直绿化系统（VGS）在热浪期间对地中海城市小气候的影响

本研究调查了垂直绿化系统（VGS）在四次热浪和夏季条件下调节真实尺度地中海气候街道峡谷中室外微气候的潜力，以及与无植被对照的差异。在两个峡谷中使用一套相同的传感器评估了 VGS 对空气温度的冷却效果。使用辐射通量、Mr.T 工具和 ENVI-met 模型评估了对热舒适度的影响，并根据测量数据进行了验证。VGS 改善了峡谷上方（3.9-4.1°C）和行人层（2.21-2.8°C）的平均辐射温度（Tmrt），而生理当量温度（PET）和通用热气候指数（UTCI）分别平均下降了 0.67-1.07°C 和 0.63-0.8°C 。阴影墙提高了平均 Tmrt（11.7°C）、PET（3.2°C）和 UTCI（2.7°C），反映了阴影在城市环境中的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Building and Environment 工程技术-工程：环境

CiteScore

12.50

自引率

23.00%

发文量

1130

审稿时长

27 days

期刊介绍： Building and Environment, an international journal, is dedicated to publishing original research papers, comprehensive review articles, editorials, and short communications in the fields of building science, urban physics, and human interaction with the indoor and outdoor built environment. The journal emphasizes innovative technologies and knowledge verified through measurement and analysis. It covers environmental performance across various spatial scales, from cities and communities to buildings and systems, fostering collaborative, multi-disciplinary research with broader significance.