将城市扩张与热应力联系起来:评估布雷瓦拉的土地利用过渡,光谱动态和地表温度
Ju Zhang1, Sajid Ullah2,3, Aqil Tariq4
1College of Public Administration, Nanjing Agricultural University, Nanjing, China.
Environmental monitoring and assessment
|March 14, 2026
概括
布雷瓦拉市的城市扩张导致土地表面温度 (LST) 增加,热舒适度降低,尽管建筑面积增长温和. 植被健康状况下降 (NDVI) 和表面水分流失加剧了城市热岛效应.
科学领域:
- 环境科学 环境科学
- 城市生态城市生态学
- 遥感 遥感 遥感 遥感
背景情况:
- 土地使用和土地覆盖 (LULC) 变化对城市热环境和生态功能产生重大影响.
- 城市化推动了影响表面温度和植被健康的变化.
研究的目的:
- 调查LULC的时空动态,土地表面温度 (LST) 和布雷瓦拉市的光谱指数.
- 分析城市增长,LST和生态热舒适之间的关系.
主要方法:
- 利用Landsat的多时间图像 (2003年,2014年,2023年) 进行监督分类和过渡矩阵分析.
- 计算了规范化差异构建指数 (NDBI),规范化差异植被指数 (NDVI) 和规范化差异水指数 (NDWI).
- 评估土地表面温度 (LST) 和城市热场变量指数 (UTFVI).
主要成果:
- 城市建筑面积增加了19.05平方公里,主要是转换裸露的土壤.
- 植被覆盖略有增加,但NDVI显示健康状况明显下降.
- 平均LST从26.87°C大幅上升到36.76°C,其中建筑区是最热的.
- 在LST和NDVI之间发现了强烈的负相关性 (R2=0.82到0.76).
结论:
- 城市增长,植被退化和表面水分损失是增加LST和降低热舒适度的关键驱动因素.
- 有效的城市减热需要增强植被,恢复水循环,并在高压力区域进行有针对性的干预.
- 调查结果强调需要综合土地利用规划和生态考虑,以应对城市热岛效应.
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