COVID-19大流行对南昌市热岛效应的影响评估

Evaluation of the Impact of COVID-19 Pandemic on the Heat Island Effect in Nanchang City

COVID-19疫情对城市环境产生了显著而广泛的影响。以南昌市为研究对象,运用劈窗算法,利用多时相遥感数据反演城市地表温度,由此对疫情不同阶段不同土地利用类型的热岛效应的时空分布特征进行了分析,从而揭示了COVID-19疫情防控不同时期城市热环境变化的规律。结果表明,与疫情之前同时期的情况对比,在2次封控管理期间,城市热岛效应分别下降了57%和49.3%,且这种下降幅度随着距离城市中心的增加而减小。此外,不同土地覆盖类型的热岛效应变化幅度存在差异。水体、森林、荒地和农田的热岛效应下降幅度相对较小,而城镇区域的热岛效应下降幅度较大。这些发现对深入理解疫情防控的不同阶段城市热环境的时空变化提供了重要的实证研究支持,也为优化城市规划和管理策略,减轻城市热岛效应,并为未来类似的突发事件提供参考。

The COVID-19 pandemic has had a significant and widespread impact on urban environments.This study takes Nanchang city as the research object and uses the split window algorithm to invert urban surface temperature using multi temporal remote sensing data.Based on this,the spatiotemporal distribution characteristics of the heat island effect of different land use types at different stages of the COVID-19 epidemic were analyzed,revealing the laws of urban thermal environment changes at different stages of COVID-19 epidemic prevention and control.The research results indicate that,compared with the situation before the epidemic and during the same period,the urban heat island effect decreased by 57%and 49.3%respectively during the two lockdowns,and the magnitude of this decrease decreases as the distance from the city center increases.In addition,there are differences in the magnitude of heat island effect changes among different land cover types.The decrease in heat island effect in water bodies,forests,wasteland,and farmland is relatively small,while the decrease in heat island effect in urban areas is significant.These findings provide important empirical research support for our in-depth understanding of the spatiotemporal changes in urban thermal environment at different stages of epidemic prevention and control.Further research can help us optimize urban planning and management strategies to reduce urban heat island effects and provide reference for similar emergencies in the future.