评估过去三十年卢旺达基加利上空土地利用和土地覆盖变化对地表温度的影响

IF 5.4 Q1 ENVIRONMENTAL SCIENCES Environmental and Sustainability Indicators Pub Date : 2024-08-08 DOI:10.1016/j.indic.2024.100452
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引用次数: 0

摘要

土地利用变化和城市活动导致环境退化和气候变化。本研究旨在评估过去三十年卢旺达基加利土地利用和土地覆盖(LULC)变化对地表温度(LST)的影响。研究采用遥感和地理信息系统(GIS)相结合的技术,生成高质量的大地遥感卫星图像,划分土地利用等级,并检索城市指数。使用修正的 Mann-Kendall 检验法和 Sen 的斜率估计法分析 LST 的变化趋势。结果表明,1990 年至 2020 年间,建成区和森林面积分别以平均每年 3.39 平方公里和 2.42 平方公里的速度增加,而空地则以平均每年 5.81 平方公里的速度减少。同期,水体和湿地的变化极小,水体和湿地分别增加了 1.56 平方公里和减少了 1.66 平方公里。LST 的斜率幅度主要为正(p ≤ 0.05),旱季的增幅较大(JJA 的 Tmin 为每十年 0.51 °C,JF 的 Tmax 为每十年 0.49 °C)。在所有研究的次区域都观察到了 LST 与城市指数之间的正相关(所有值都高于 0.61,P ≤ 0.05)。这项研究的结果有助于制定未来的城市土地利用方案,以及采取减缓和适应气候变化的战略。
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Assessing the impact of Land Use Land Cover changes on land surface temperature over Kigali, Rwanda in the past three decades

Land use changes and urban activities cause environmental degradation and climate change. This study aims to assess the impacts of Land Use Land Cover (LULC) changes on land surface temperature (LST) in Kigali, Rwanda over the past three decades. The combined techniques of remote sensing and GIS were applied to generate good quality Landsat images, categorize land use classes and retrieve urban indices. The modified Mann-Kendall test and Sen’s slope estimator were used to analyze trends in LST. The results indicate that between 1990 and 2020, the extent of builtup and forest areas have increased at an average rate of 3.39 km2/year and 2.42 km2/year respectively, while open land has decreased at an average rate of 5.81 km2/year. In the same period, water bodies and wetlands showed minimal changes with an increase of 1.56 km2 and a decrease of 1.66 km2 for water bodies and wetlands respectively. The slope magnitudes of LST are predominantly positive (p ≤ 0.05) with a high increase observed in dry seasons (0.51 °C per decade for Tmin in JJA and 0.49 °C per decade for Tmax in JF). The positive correlations between LST and urban indices were observed in all studied subregions (all values are above 0.61, p ≤ 0.05). The findings of this study are useful for the development of future urban land use schemes and the adoption of mitigation and adaptation strategies in response to climate change.

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来源期刊
Environmental and Sustainability Indicators
Environmental and Sustainability Indicators Environmental Science-Environmental Science (miscellaneous)
CiteScore
7.80
自引率
2.30%
发文量
49
审稿时长
57 days
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