The rise in urban air temperature has forced the researchers to look for nature-based solutions to resolve the problem sustainably. Urban waterbody plays a multidimensional role in the well-being of the city by catering to its economical, ecological, and socio-cultural needs. It can offer a potential solution for urban heat attenuation, but its effect on outdoor thermal comfort is contentious in humid subtropical climate. This study investigates the thermal impact of waterbody on its surroundings in humid subtropical climate by adopting a human centric approach. Waterbody impact on ambient air temperature, PET, and UTCI are evaluated and compared for a better understanding of its thermal impact on nearby surroundings. This study employs a CFD-based simulation model Envi-met for microclimate analysis. The results show that a dynamic waterbody lowers the ambient air temperature during daytime in summer of its nearby surroundings in humid subtropical climate. Maximum cooling is observed in open mid-rise LCZ where the cooling impact range is 140 m with the amplitude of 2.59 °C and compact low-rise LCZ exhibits minimum cooling of the identified LCZs with the cooling impact ending 24 m from waterbody edge with amplitude being 0.131 °C in the study area. Air temperature, UTCI, and PET do reflect the same trend when moving away from the waterbody in large low-rise LCZ, but it decreases drastically in open mid-rise LCZ and is non-existent in compact low-rise. This result provides an insight on the impact of waterbody on thermal comfort in its surroundings in humid subtropical climate, thus assisting urban planners and designers in making context-specific holistic decision.

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恒河运河对印度 Roorkee 市热舒适性的影响

城市气温的上升迫使研究人员寻找基于自然的解决方案来可持续地解决问题。城市水体通过满足城市的经济、生态和社会文化需求，在城市福祉中发挥着多方面的作用。它可以为城市热衰减提供潜在的解决方案，但它对室外热舒适的影响在亚热带潮湿气候中存在争议。本研究采用以人为本的方法，研究了亚热带湿润气候下水体对其周围环境的热影响。评估和比较水体对环境空气温度、PET 和 UTCI 的影响，以便更好地了解其对附近环境的热影响。本研究采用基于 CFD 的模拟模型 Envi-met 进行微气候分析。结果表明，在亚热带湿润气候下，动态水体在夏季白天降低了其附近环境的环境气温。在开放式中层 LCZ 中观察到最大冷却，其中冷却影响范围为 140 m，振幅为 2.59 °C，紧凑型低层 LCZ 表现出对已识别 LCZ 的最小冷却，冷却影响在距离水体边缘 24 m 处以振幅结束研究区为 0.131 °C。在大型低层 LCZ 远离水体时，气温、UTCI 和 PET 确实反映了相同的趋势，但在开放式中层 LCZ 中急剧下降，而在紧凑型低层中则不存在。该结果提供了关于水体在亚热带湿润气候下对其周围环境热舒适性的影响的见解，