Local temperature impact of urban heat mitigation strategy based on WRF integrating urban canopy parameters and local climate zones

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

Building and Environment Pub Date : 2024-11-01 DOI:10.1016/j.buildenv.2024.112257

Jingqi Chen , Na Dong , Zhen Liu , Yimin Chen , Ming Luo , Huabing Huang

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引用次数: 0

Abstract

Urbanization has led to significant alterations in surface properties, contributing to surging urban heatwave events. The detrimental impact of urban heatwaves on public health highlights the urgency for proactive evaluations of diverse heat mitigation strategies. This study assesses the impacts of cool roof (CR), green roof (GR) and rooftop photovoltaic panel (PV) strategies on urban air temperatures within Guangzhou and Foshan agglomeration, utilizing the Weather Research and Forecasting with Urban Canopy Model (WRF-UCM). A comparative analysis of heat exchanges is conducted between two types of urban morphology datasets: local climate zone maps with categorized urban canopy parameters (LCZ-UCPs) and gridded urban canopy parameters from real building databases (gridded-UCPs). The results indicate that the discrepancies in the average temperature between LCZ-UCP and gridded-UCP is almost negligible, whereas increase to 0.39 °C and 0.54 °C for the daily maximum and minimum temperature, respectively. CR provides the most substantial cooling at an average of 0.44 °C, followed by GR and PV. Scenarios with the two types of morphology datasets reveal varying mitigation efficiencies. CRs with LCZ-UCPs show more pronounced temperature reductions, whereas GRs and PVs with gridded-UCPs in central urban regions demonstrate stronger cooling effects. CRs and PVs cool temperature by decreasing sensible heat flux, whereas GR is largely influenced by enhanced evapotranspiration especially with grass plantation. These findings elucidate the differing efficiencies of the three mitigation strategies and highlight the representation discrepancies in climatic simulations brought by the two urban canopy datasets. This emphasizes the importance of accurate urban morphological datasets in evaluating mitigation strategies in WRF-UCM, thus providing practicable insights for urban planning and climate policy-making.

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基于 WRF 的城市热量减缓战略对当地气温的影响，整合了城市冠层参数和当地气候区

城市化导致地表特性发生重大变化，导致城市热浪事件激增。城市热浪对公众健康的不利影响凸显了积极评估各种热缓解策略的紧迫性。本研究利用城市冠层气象研究与预测模型（WRF-UCM），评估了凉爽屋顶（CR）、绿色屋顶（GR）和屋顶光伏板（PV）策略对广州和佛山城市群气温的影响。对两类城市形态数据集进行了热交换比较分析：带有分类城市冠层参数的当地气候区图（LCZ-UCPs）和来自真实建筑数据库的网格化城市冠层参数（网格化-UCPs）。结果表明，LCZ-UCP 与网格化 UCP 之间的平均气温差异几乎可以忽略不计，但日最高气温和日最低气温的差异分别增加到 0.39 ℃ 和 0.54 ℃。CR 的平均降温幅度最大，为 0.44 °C，其次是 GR 和 PV。两种形态数据集的情景显示了不同的减缓效率。使用 LCZ-UCPs 的 CRs 显示出更明显的降温效果，而在城市中心区域使用网格 UCPs 的 GRs 和 PVs 则显示出更强的降温效果。CRs 和 PVs 通过降低显热通量来降温，而 GRs 则主要受到蒸散作用增强的影响，尤其是在植草的情况下。这些发现阐明了三种降温策略的不同效率，并强调了两种城市冠层数据集在气候模拟中的代表性差异。这强调了准确的城市形态数据集在 WRF-UCM 中评估减缓策略的重要性，从而为城市规划和气候政策制定提供了切实可行的见解。

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.