State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 211100, China; College of Computer and Information, Hohai University, Nanjing 211100, China.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 211100, China.
Ecotoxicol Environ Saf. 2022 Jun 1;237:113521. doi: 10.1016/j.ecoenv.2022.113521. Epub 2022 Apr 18.
With the rapid development of China's economy and the continuous improvement of people's living standards, large-scale infrastructure constructions (LSICs) are also increasing rapidly. LSICs with impervious surfaces have increasingly resulted in replacing natural landscapes, altering surface radiation, thermal properties, and humidity in urban areas. To study the environmental thermal changes of Beijing Daxing International Airport before and after its construction and operation, four Landsat-8 images (from the year of 2014, 2017, 2019, and 2021) were used to calculate the land surface temperature (LST). Then the LST values of four images covering the study area were compared and analyzed using the urban heat island ratio index (URI). Results show that the URI value of this area increased from 0.120 of 2014 to 0.185 of 2017 after the construction of Daxing Airport, indicating that the urban surface heat island effect in this area greatly increased. Additionally, the URI value of this area increased from 0.153 of 2019 to 0.206 of 2021 after the operation of Daxing Airport, indicating that the surface urban heat island effect in this area further increased. Therefore, we infer that this effect is closely related to airport construction and operation. Afterward, the random forest classification algorithm is used to classify land types based on pixels, and then the relationship between URI and land classification types was discussed. It is found that before the construction of Daxing Airport, both dark buildings and bare land contribute significantly to the thermal environment of the airport. After the completion of Daxing Airport, the contribution model was changed to high-reflectivity buildings and bright soil. The thermal pollution generated by the airport has a greater impact on the ground objects within the range of 7.5 km, and a relatively smaller impact on the ground objects outside the range of 9.5 km. Our results can provide a valuable reference for the study of the thermal environment caused by human activities.
随着中国经济的快速发展和人民生活水平的不断提高，大规模基础设施建设（LSICs）也在迅速增加。具有不透水面的 LSICs 越来越多地取代了自然景观，改变了城市地区的表面辐射、热特性和湿度。为了研究北京大兴国际机场建设前后的环境热变化，使用了四张 Landsat-8 图像（分别来自 2014 年、2017 年、2019 年和 2021 年）来计算地表温度（LST）。然后，使用城市热岛比指数（URI）比较和分析了覆盖研究区域的四张图像的 LST 值。结果表明，大兴机场建设后，该区域的 URI 值从 2014 年的 0.120 增加到 2017 年的 0.185，表明该区域城市表面热岛效应大大增加。此外，大兴机场运营后，该区域的 URI 值从 2019 年的 0.153 增加到 2021 年的 0.206，表明该区域的表面城市热岛效应进一步增加。因此，我们推断这种效应与机场建设和运营密切相关。之后，使用随机森林分类算法根据像素对土地类型进行分类，然后讨论了 URI 与土地分类类型之间的关系。结果发现，在大兴机场建设之前，深色建筑物和裸地对机场的热环境有显著贡献。大兴机场建成后，贡献模型变为高反射率建筑物和亮土。机场产生的热污染对 7.5 公里范围内的地面物体影响较大，对 9.5 公里范围外的地面物体影响较小。我们的研究结果可为人类活动引起的热环境研究提供有价值的参考。
