土地利用和土地覆被变化对地表温度的影响:埃塞俄比亚西南部四个城市的比较研究

Q2 Environmental Science Environmental Challenges Pub Date : 2024-08-01 DOI:10.1016/j.envc.2024.101002
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引用次数: 0

摘要

由于人口快速增长,城市气候发生了重大变化,导致植被覆盖率下降,地表温度(LST)上升。本研究旨在评估 2002 年至 2024 年期间埃塞俄比亚西南部四个主要城市地区(即 Jimma、Bonga、Mattu 和 Nekemte)的土地利用、土地覆被变化对 LST 的影响。为了研究 LULC 动态对 LST 的影响,我们使用了 30 米空间分辨率的 Landsat 图像,包括 2002 年的专题成像仪 (TM)、2014 年和 2024 年的 Landsat 陆地成像仪 (OLI) 和热红外 (TIRS)。在过去的 22 年中,Bonga、Nekemte、Mattu 和 Jimma 的平均 LST 分别上升了 2.81 °C、2.94 °C、3.37 °C 和 3.96 °C。LST 的上升可归因于多种因素,但其中一个主要原因与快速城市化和森林覆盖率下降有关。快速城市化引发的 LULC 变化对大城市的 LST 产生了重大影响。结果表明,不透水表面的增加和植被覆盖的减少是导致 LST 上升趋势的关键因素。结果表明,植被覆盖率较低的城市中心的 LST 比周围地区要高。研究结果表明,有必要进行有效的城市规划,通过城市绿化和公园来增加植被覆盖率,以缓解 LST 的上升趋势,从而改善城市热舒适度。
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Impact of land use and land cover change on land surface temperature: Comparative studies in four cities in southwestern Ethiopia

The urban climate has undergone significant changes due to rapid population growth, leading to a decline in vegetation cover and an increase in land surface temperature (LST). This study aims to assess the influence of land use land cover (LULC) changes on LST in four major urban areas in southwestern Ethiopia, namely Jimma, Bonga, Mattu and Nekemte, during the period from 2002 to 2024. To investigate the impact of LULC dynamics on LST, 30 m spatial resolution images from Landsat were utilized, including Thematic Mapper (TM) for the year 2002 and Landsat Operational Land Imager (OLI) and Thermal Infrared (TIRS) for the years 2014 and 2024. Over the past 22 years, the mean LST has increased by 2.81 °C, 2.94 °C, 3.37 °C, and 3.96 °C for Bonga, Nekemte, Mattu, and Jimma, respectively. The increase in LST can be attributed to various factors, but one of the primary reasons is linked to the rapid urbanization and decrease in forest cover. Changes in LULC triggered by rapid urbanization significantly influences LST in major cities. The results highlight the increment of impervious surface and the decline in vegetation cover as key factors contributing to the upward trend in LST. The results indicate that urban centers with less vegetation cover experienced higher LST compared to their surroundings. The results of this study indicate the necessity of effective urban planning to increase vegetation cover through urban greenery and parks to mitigate the increasing trends of LST, which can improve urban thermal comfort levels.

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来源期刊
Environmental Challenges
Environmental Challenges Environmental Science-Environmental Engineering
CiteScore
8.00
自引率
0.00%
发文量
249
审稿时长
8 weeks
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