Effects of pavement watering on the thermal environment above an impermeable pavement in a hot and humid area

IF 6 2区工程技术 Q1 ENVIRONMENTAL SCIENCES

Urban Climate Pub Date : 2025-03-25 DOI:10.1016/j.uclim.2025.102387

Qiong Li , Xiaohui Lu , Peijie Tang , Zining Qiu , Qi Li , Qinglin Meng

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引用次数: 0

Abstract

Pavement watering is an effective evaporative cooling strategy for alleviating the heat of pavements, but its effectiveness on impermeable pavements in hot and humid areas needs to be verified. This study both qualitatively and quantitatively investigated the effect of pavement watering on the thermal environment above an impermeable pavement in Guangzhou. The results showed that pavement watering reduced the upward shortwave and longwave radiation, resulting in an increase in net radiation that could be offset by the latent heat (Q_E) of water evaporation, thereby reducing the surface temperature (T_s), sensible heat and heat storage of the pavement. The reduction in T_s was a significant factor contributing to the improvement of thermal environment parameters. High humidity levels are not favorable for the reduction in T_s and evaporative cooling in hot and humid regions. However, the exponential function between Q_E and relative humidity (RH) indicated when RH approached 100 %, the Q_E value could converge to approximately 178 W/m². Bowen ratio revealed that the pavement was able to imitate a highly evaporative environment by pavement watering. Furthermore, the biometeorological indices in hot and humid area were moderated by the synergistic effect of reduced T_s and increased wind speed, which was benefit from evaporative cooling.

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来源期刊

Urban Climate Social Sciences-Urban Studies

CiteScore

9.70

自引率

9.40%

发文量

286

期刊介绍： Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]