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The evaluation of heat-mitigation strategies on outdoor heat stress in the waterfront public spaces
(Lodz University of Technology Press, 2023) Jang Gukhwa; Kim Saehoon; Lee Jae Seung
Due to climate change, urban thermal discomfort has become a common concern for urban planners. Urban water bodies play an important role in the quality of urban public spaces, significantly influencing the urban microclimatic condition. However, poorly planned waterfront spaces worsen heat stress and block fresh airflow into urban areas. Given that the water bodies are a public asset for improving urban microclimate, the design process for waterfront areas should incorporate consideration of the urban thermal condition. Thus, the purpose of this study was to suggest heat-mitigation strategies for waterfront areas by evaluating the cooling effects of some design concepts. We focused on the following two heat mitigation strategies: 1) planning wind corridors and 2) creating diverse building height profiles. In this research, we compared the heat stress of outdoor spaces before and after applying each strategy on a hot summer day. Using ENVI-met, we modeled and simulated several models to measure air temperature, relative humidity, wind speed, mean radiant temperature and physiological equivalent temperature (PET). From the results, we identified that the two design strategies had different effects on the heat environment. The 50-meter-wide wind corridor in the center of residential blocks had noticeable cooling effects on the thermal condition by improving outdoor ventilation. On the other hand, the outdoor thermal discomfort in residential blocks with varying building heights was worsened compared to homogeneous building heights. Therefore, our implications support urban planning for mitigating overheated urban areas.