2023-04-17 バース大学
この研究は、イギリスのバス大学とイタリアのボローニャ大学の研究者によって行われ、都市環境でのさまざまなサイズと形状の水の影響をモデル化しています。結果は、都市部に小さな池がある場合、暑い夜に熱や湿気が増え、環境条件が悪化し、熱中症や死亡リスクが高まることを示しています。一方、大きな湖は、強力な水蒸気の柱を上昇させ、熱や汚染物質を街から遠ざけることができます。
＜関連情報＞
- https://www.bath.ac.uk/announcements/large-ponds-can-cool-cities-but-small-ones-can-make-temperatures-and-pollution-worse-finds-study/
- https://www.mdpi.com/2225-1154/11/2/28
ブルースペース形状が都市のヒートアイランド緩和に与える影響 Impact of Blue Space Geometry on Urban Heat Island Mitigation
Petros Ampatzidis,Carlo Cintolesi andTristan Kershaw
Climate Published: 19 January 2023
DOI:https://doi.org/10.3390/cli11020028
Abstract
A growing body of literature recognises the importance of nature-based solutions in providing resilience to the effects of climate change by mitigating urban heat islands. However, a knowledge gap exists regarding the contribution of blue spaces to the urban environment. Recent evidence suggests that blue spaces within urban canyons can promote pollutant removal via the vertical transport of air under certain conditions, but this is inconclusive. Using a numerical solver that accounts for evaporation effects, we investigate the influence of blue space size and shape on the in-canyon flow structure, temperature and water vapour distribution. Simulations were performed for water bodies of varying size and shape at different temperatures compared to the surrounding air. Results suggest that inadequately sized warmer water bodies are unable to promote sufficient vertical transport for pollutant removal, leading to overturning and increased temperature and humidity levels at the pedestrian level, thereby worsening environmental conditions and increasing the risk of heat-related illness and mortality. Hence, larger water bodies are better suited to nocturnal transport of pollutants and accumulated warm air away from the urban surface, while smaller water bodies are better suited to providing localised evaporative cooling. Lastly, irregular water bodies may have a greater cooling effect across a larger area.
