Abstract

Aim of the study is to analyze the effect of pavement reflectance and aspect ratio on air and surface temperature reductions in a scale model of an urban canyon. The model, named PAVSCAM (PAVement and Street CAnyon Model), consists of two sets of four lanes disposed between concrete blocks, with 5 m in length and 1.2 m in width, which are covered with different paving materials. Hollow concrete blocks serve as ‘buildings’ whereas the lanes are regarded as ‘streets’. Two sets of lanes are used for testing H/W ratios of 0.33 and 0.66, for block heights of 40 cm and 80 cm, respectively. Interlocking, semi-permeable concrete paver blocks were tested, in light and dark gray, against asphalt used as a reference. Thermocouples were used to assess air and surface temperature at canyon height and on the ground, respectively along with the air temperature measured at “pedestrian height”. Results allowed us to infer on the interplay of thermal properties, aspect ratios, and surface reflectance, observed in measured data, and the impact of shading during two monitoring rounds in spring at a tropical location (at 22°17'00”S, 47°07'00”W) characterized by a Koeppen-Geiger’s Aw climate classification. PAVSCAM proved to be effective in studying microclimate phenomena in a simplified and cost-effective manner.

中文翻译：

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评估街道峡谷比例模型中路面反射率和纵横比对热条件的影响：引入 PAVSCAM

摘要

该研究的目的是在城市峡谷的比例模型中分析路面反射率和纵横比对空气和表面温度降低的影响。该模型名为 PAVSCAM（PAVement 和 Street CANyon 模型），由两组设置在混凝土块之间的四车道组成，长 5 m，宽 1.2 m，覆盖有不同的铺装材料。空心混凝土块被视为“建筑物”，而巷子则被视为“街道”。两组泳道用于测试块高度分别为 40 厘米和 80 厘米的 H/W 比率为 0.33 和 0.66。以浅灰色和深灰色的联锁半渗透混凝土摊铺块作为参考，对沥青进行了测试。使用热电偶分别评估峡谷高度和地面的空气和表面温度，以及在“行人高度”测量的空气温度。结果使我们能够推断在测量数据中观察到的热特性、纵横比和表面反射率的相互作用，以及春季在热带地区（南纬 22°17'00”，47 °07'00”W) 以 Koeppen-Geiger 的 Aw 气候分类为特征。事实证明，PAVSCAM 能够以简单且经济高效的方式有效研究微气候现象。