Cities experience overheating due to factors such as urban form and materials, concentration of human activities, reduction in the amount of vegetation and water surfaces. Vegetation is one of the ways to reduce temperature peaks in the city during heat waves. The objectives of this paper are twofold: first, to study the impact on the microclimate of a north-south oriented canyon street at reduced-scale (1/5), then to study the impact of well-watered trees on the street microclimate. This study provides a highly integrated view of climatic mechanisms through the measurement of a set variables, including air temperature, relative humidity, wall temperature, conductive and radiation fluxes as well as tree transpiration and thus allows a better understanding of the physical phenomena at stake. It shows that the canyon street created an urban overheating of up to 2.8 °C during the night, and up to 2.4 °C during the day, and that trees reduced the air temperature in the street by up to 2.7 °C during the day. Finally, trees improved human thermal comfort with a reduction of 8 °C of the Universal Thermal Climate Index at midday.

由于城市形态和材料，人类活动集中，植被和水面数量减少等因素，城市经历了过热。植被是减少热浪期间城市温度峰值的方法之一。本文的目的是双重的：首先，研究缩小比例（1/5）的南北向峡谷街道对小气候的影响，然后研究灌溉良好的树木对街道小气候的影响。这项研究通过测量一组变量（包括气温，相对湿度，壁温，传导和辐射通量以及树木的蒸腾作用）提供了高度综合的气候机制观点，从而使人们对所涉及的物理现象有了更好的了解。结果表明，峡谷街道在夜间造成城市最高温度高达2.8°C，在白天则高达2.4°C，树木在白天将街道上的空气温度降低了2.7°C。最后，树木改善了人类的热舒适性，使中午的全球热气候指数降低了8°C。