A Systematic Assessment of Greening Interventions for Developing Best Practices for Urban Heat Mitigation—The Case of Huế, Vietnam

Sebastian Scheuer, Luca Sumfleth, Long Dac Hoang Nguyen, Ylan Vo, Thi Binh Minh Hoang, Jessica Jache
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Abstract

The health of urban populations is increasingly at risk due to the amplification and chronification of urban heat stress by climate change. This is particularly true for urban environments in humid tropical climates, including many cities in Southeast Asia. It is also in these locations where increasing climatic risks may be exacerbated by urban growth, underscoring the need to develop effective mitigation strategies for strengthening urban resilience and supporting climate change adaptation. Conservation and widespread implementation of green infrastructure (GI) are regarded as one means to counter heat as a public health threat. However, for lower-income countries across Southeast Asia, such as Vietnam, knowledge gaps remain with respect to the effectiveness of greening interventions for heat mitigation. To address this gap, in the context of urban expansion in the humid tropical city of Huế, Vietnam, diurnal cooling potential and regulation of outdoor thermal comfort (OTC) within a wide, shallow street canyon were systematically assessed for selected elements of GI along a quantitative and qualitative dimension using ENVI-met. Tree-based interventions were found to be most effective, potentially decreasing UTCI by −1.9 K at the domain level. Although lower in magnitude, green verges and green facades were also found to contribute to OTC, with green verges decreasing UTCI by up to −1.7 K and green facades by up to −1.4 K locally. Potential synergistic cooling impacts were identified through a combination of GI elements. However, no scenario was found to decrease heat stress to zero or moderate levels. Substantially reducing heat stress may thus require further measures and a closer consideration of local morphological characteristics.
对绿化干预措施进行系统评估,以制定缓解城市热量的最佳做法--越南胡缔市的案例
由于气候变化导致城市热压力的扩大和慢性化,城市人口的健康正日益受到威胁。这一点在热带潮湿气候的城市环境中尤为明显,包括东南亚的许多城市。也正是在这些地方,日益增长的气候风险可能会因城市增长而加剧,这突出表明有必要制定有效的减缓战略,以加强城市的抗灾能力并支持适应气候变化。保护和广泛实施绿色基础设施(GI)被视为应对高温这一公共健康威胁的手段之一。然而,对于越南等东南亚低收入国家来说,在绿化干预措施的防暑降温效果方面仍然存在知识差距。为了填补这一空白,在越南湿热城市胡缔的城市扩张背景下,利用 ENVI-met,从定量和定性两个维度对宽而浅的街道峡谷内的昼间降温潜力和室外热舒适度(OTC)调节进行了系统评估。结果发现,以树木为基础的干预措施最为有效,可在领域水平上将 UTCI 降低 -1.9 K。虽然程度较低,但绿化带和绿色外墙也被认为有助于实现气候调节,绿化带可使UTCI降低-1.7 K,绿色外墙可使局部UTCI降低-1.4 K。通过综合利用各种地理信息要素,发现了潜在的协同冷却影响。然而,没有发现任何方案可将热应力降至零或中等水平。因此,要大幅降低热应力,可能需要采取进一步的措施,并更仔细地考虑当地的形态特征。
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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