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首页> 外文期刊>Building and Environment >Vegetation cover and plant-trait effects on outdoor thermal comfort in a tropical city
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Vegetation cover and plant-trait effects on outdoor thermal comfort in a tropical city

机译：植被覆盖和植物特征对热带城市室外热舒适的影响

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An increase in urban vegetation is an often proposed mitigation strategy to reduce urban heat and improve outdoor thermal comfort (OTC). Vegetation can alter urban microclimate through changes in air temperature, mean radiant temperature, humidity, and wind speed. In this study, we model how street tree and ground vegetation cover and their structural, optical, interception, and physiological traits control the diurnal cycle of OTC in different urban densities in a tropical city (Singapore). For this purpose, we perform a variance based sensitivity analysis of the urban ecohydrological model UT&C. Model performance is evaluated through a comparison with local microclimate measurements and OTC is assessed with the Universal Thermal Climate Index (UTCI).We find a pronounced daily cycle of vegetation effects on UTCI. Tree cover fraction is more efficient in decreasing UTCI during daytime, while a higher vegetated ground fraction provides more cooling during night. Generally, increasing vegetation cover fractions do not deter OTC, except in certain urban densities during some periods of the day. An increase in tree and ground vegetation fractions provides a higher average UTCI reduction compared to a change in vegetation traits (0.9 - 2.9 degrees C vs. 0.7 - 1.1 degrees C during midday, 10 month average). The increase in humidity related to plant transpiration prevents further reduction of UTCI. However, the choice of vegetation traits enhancing tree transpiration can decrease UTCI during hot periods. These results can inform urban planners on the selection of vegetation amount and traits to achieve feasible OTC improvements in tropical cities.
机译：城市植被的增加是一种经常提出的缓解策略，以减少城市热量，提高室外热舒适度（OTC）。植被可以通过空气温度，平均辐射温度，湿度和风速来改变城市小气候。在这项研究中，我们模拟了街道树木和地面植被覆盖以及它们的结构，光学，拦截和生理性状，控制了热带城市不同城市密度（新加坡）的OTC的昼夜循环。为此，我们对城市生态水文模型UT＆C的基于方差的敏感性分析。通过与局部小气候测量的比较进行模型性能，并且通过通用热气候指数（UTCI）评估OTC。我们在UTCI中找到了一份明显的日常植被效果循环。树盖分数在白天减少UTCI时更有效，而较高的植被地面部分在夜间提供更多冷却。通常，除了在一天的某些时期，植被覆盖分数不会阻止OTC，除了某些城市密度。与植被特征的变化相比，树木和地面植被分数的增加提供了更高的平均utci降低（0.9-2.9摄氏度，0.7 - 1.1摄氏度，10个月平均值）。与植物蒸腾有关的湿度的增加可防止utci进一步减少。然而，植被性质的选择增强树蒸腾可能会在热时段期间减少UTCI。这些结果可以为城市规划者提供植被数量和特征，以实现热带城市的可行性OTC改进。

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