Abstract
The aim of this study is to suggest planning strategies for managing comfortable thermal environments in urban areas by local cold air generated in mountains, which finally contributes to making sustainable and eco-friendly cities. For this purpose, we selected urban areas in the Honam Jeongmaek in Korea and analyzed the nighttime cold airflow and altitude of the cold air layer generated in mountains, by using the KALM (Kaltluftabflussmodell) model which calculates the amount of cold air generated during the nighttime without winds. The results of analysis found that the local airflows generated in Mt. Chuwol, Mt. Mudeung, Mt. Cheonun, Mt. Byeongpung and Mt. Geum influenced the entire study site from across Gwangju Metropolitan City to adjacent areas. Therefore, the mountains generated major cold airflows should be designated as the management area for securing cooling function. As a result of detailed analysis, most developed areas, such as Buk-gu, Seo-gu and Nam-gu, as well as industrial areas, did not have a smooth flow, so management strategies were needed. In particular, Mt. Mudeung and Mt. Cheonun were the source areas of the local cold air generation and the generated flows from the mountains could influence into developed areas of Gwangju Metropolitan City. Thus, thorough preservation policies are required for Mt. Mudeung and Mt. Cheonun from development that causes damages to mountainous terrain and topography. This study could support the establishment of systematic management plans of the Honam Jeongmaek in preparation for climate change. In addition, it is expected to be used to develop policies related to the quantitative expansion of mountain areas with cooling functions and the conservation of sustainable mountain areas.
Highlights
Owing to global warming caused by climate change, various environmental problems are intensifying in urban areas, such as increased heat waves, tropical nights, air pollution and flooding [1,2]
It is used as a concept similar to the meaning of fresh air not contaminated by air pollution and it varies depending on weather conditions, land use, and topography
We calculated the local cold airflow and altitude of local cold air layer generated during the nighttime in the mountains by administrative areas
Summary
Owing to global warming caused by climate change, various environmental problems are intensifying in urban areas, such as increased heat waves, tropical nights, air pollution and flooding [1,2]. Urban heat islands, which occur when the temperature in the urban area is significantly higher than the surrounding areas, is becoming more serious than and intensifies more during the night than in the daytime It affects human habitability, and may lead to the death of urban residents in serious cases [7]. Local cold air which means nocturnal drainage is generated by the afternoon-evening cooling process, more precisely in the clear nighttime without clouds It is used as a concept similar to the meaning of fresh air not contaminated by air pollution and it varies depending on weather conditions, land use, and topography. Foreign countries have been paying attention to the local cold air generated from mountains located outside the city for a long time and tried to establish the city through a wind corridor plan that draws cold air into the city
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