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Impact of anthropogenic activities on urban heat islands in major cities of El-Minya Governorate, Egypt
The Egyptian Journal of Remote Sensing and Space Sciences ( IF 3.7 ) Pub Date : 2022-04-07 , DOI: 10.1016/j.ejrs.2022.03.014
Kamel Mansour 1 , Mohamed Alkhuzamy Aziz 2 , Seham Hashim 3 , Hala Effat 1
Affiliation  

Urban heat islands (UHIs) represent one of the significant factors in regard to environmental and human health. UHIs are significantly changeable, responding to the land use type and the dominant anthropogenic activities. In this research, UHIs in El-Minya cities were identified based on Land Surface Temperature (LST) measurements. Thermal bands of Landsat imagery were processed to produce LST in the cities of El-Minya governorate in 2001, 2011, and 2021. In addition, the spectral indices; Normalized Difference Vegetation Index (NDVI), the Modified Normalized Difference Water Index (MNDWI), and the Normalized Difference Built-up Index (NDBI) were retrieved from the processing of multispectral Landsat imagery to assess different Land-cover units in the study area and to detect their correlation with LST/UHIs. Analysis of data indicated that LST variations are corresponding with different land-cover types. It was found that NDVI and NDWI have a strong negative influence on LST (R = −0.7 and −0.8 for both indices, respectively), while NDBI has a significant positive correlation (R = 0.85). Furthermore, the highest LST was detected at the cities of El-Minya, New-El-Minya, and Malawi, consequently. These regions have the greatest potential for UHIs formation among other El-Minya governorate cities. The year 2021 recorded the highest average LST with a value of 34.1 °C where the largest UHI area was observed in New-El-Minya (2.74Km2) in 2001, and (2.6 Km2) in 2021, as well as (1.12Km2) in El-Minya in 2011. It can be concluded that increasing LST and UHIs at different districts of El-Minya arise from urbanization and industrialization processes.



中文翻译:

埃及埃尔明亚省主要城市的人为活动对城市热岛的影响

城市热岛 (UHI) 是影响环境和人类健康的重要因素之一。UHIs 是显着变化的,响应于土地利用类型和主要的人为活动。在这项研究中,根据地表温度 (LST) 测量确定了 El-Minya 城市的 UHI。在 2001 年、2011 年和 2021 年,Landsat 图像的热波段被处理以生成 El-Minya 省城市的 LST。此外,光谱指数;从多光谱 Landsat 图像的处理中检索归一化差异植被指数 (NDVI)、修正归一化水体指数 (MNDWI) 和归一化差异累积指数 (NDBI),以评估研究区域内的不同土地覆盖单位和检测它们与 LST/UHI 的相关性。数据分析表明,LST的变化与不同的土地覆盖类型相对应。发现 NDVI 和 NDWI 对 LST 有很强的负面影响(两个指数分别为 R = -0.7 和 -0.8),而 NDBI 具有显着的正相关性(R = 0.85)。此外,因此在 El-Minya、New-El-Minya 和马拉维等城市检测到了最高的 LST。这些地区在其他 El-Minya 省城市中具有最大的 UHI 形成潜力。2021 年记录了最高的平均 LST,值为 34.1 °C,其中在 New-El-Minya 观测到最大的 UHI 区域(2.74Km 而NDBI具有显着的正相关性(R = 0.85)。此外,因此在 El-Minya、New-El-Minya 和马拉维等城市检测到了最高的 LST。这些地区在其他 El-Minya 省城市中具有最大的 UHI 形成潜力。2021 年记录了最高的平均 LST,值为 34.1 °C,其中在 New-El-Minya 观测到最大的 UHI 区域(2.74Km 而NDBI具有显着的正相关性(R = 0.85)。此外,因此在 El-Minya、New-El-Minya 和马拉维等城市检测到了最高的 LST。这些地区在其他 El-Minya 省城市中具有最大的 UHI 形成潜力。2021 年记录了最高的平均 LST,值为 34.1 °C,其中在 New-El-Minya 观测到最大的 UHI 区域(2.74Km2 ) 2001 年和 2021 年 (2.6 Km 2 ) 以及 2011 年 El-Minya 的 (1.12Km 2 )。可以得出结论,El-Minya 不同地区的 LST 和 UHI 的增加源于城市化和工业化过程。

更新日期:2022-04-07
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