Remote sensing-based spatio-temporal rainfall variability analysis: the case of Addis Ababa City, Ethiopia

IF 2.3 Q2 REMOTE SENSING
Esubalew Nebebe Mekonnen, Ephrem Gebremariam, Aramde Fetene, Shimeles Damene
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引用次数: 0

Abstract

Climate variability is a highly debated and unavoidable global environmental challenge that has adverse effects on Ethiopia, a developing country. Hence, the objective of this research is to examine the changes in rainfall patterns in Addis Ababa City, Ethiopia, from 1981 to 2018, considering both spatial and temporal aspects. The study utilized a time-series dataset of climate information, which had a spatial resolution of 4 × 4 km, obtained from the National Meteorological Agency of Ethiopia. Supplementary data was also acquired from the Ethiopian Space Science and Geospatial Institute. To examine the rainfall variability, statistical measures such as the coefficient of variation (CV) and standardized anomaly index (SAI) were employed. Geospatial technologies and “R” programming were also used to perform a non-parametric Mann-Kendall (MK) test and Sen’s slope estimator for the investigation of both the trend and magnitude of changes. The annual, Kiremt (main rainy), and Belg (spring) seasons rainfall exhibited low to moderate variability with CV < 20% and CV < 30%, respectively, and very high variability for the Belg season (CV > 30%). The Bega season’s variability was extreme (CV > 70%). In contrast, decadal rainfall variability was generally very low (CV < 10%). The months from October to March showed higher inter-monthly variability, with CV exceeding 100%. In contrast, the Kiremt season, July, and August, experienced lower inter-monthly variability (CV < 30%). The western, north-east, and southern parts of Addis Ababa demonstrated relatively higher rainfall variability, and the trends decreased in all seasons and months, except the Kiremt season and the months of May, June, and September. However, none of these seasonal and monthly changes were statistically significant (P > 0.05). The study identified 6 years (1982, 1984, 1997, 1999, 2014, and 2015) with varying degrees of drought. Consequently, the spatio-temporal variability of precipitation should be considered in development plans, disaster risk reduction strategies, and policy measures such as flood management.

基于遥感的时空降雨量变化分析:埃塞俄比亚亚的斯亚贝巴市案例
气候多变性是一个备受争议且不可避免的全球环境挑战,对发展中国家埃塞俄比亚造成了不利影响。因此,本研究的目的是从空间和时间两方面考察 1981 年至 2018 年埃塞俄比亚亚的斯亚贝巴市降雨模式的变化。研究利用了从埃塞俄比亚国家气象局获得的空间分辨率为 4 × 4 千米的气候信息时间序列数据集。此外,还从埃塞俄比亚空间科学和地理空间研究所获得了补充数据。为研究降雨量的变异性,采用了变异系数(CV)和标准化异常指数(SAI)等统计方法。还利用地理空间技术和 "R "编程进行了非参数曼-肯德尔(MK)检验和森斜率估计,以调查变化趋势和变化幅度。年降雨量、Kiremt(主雨季)和 Belg(春季)降雨量显示出低到中等的变异性,分别为 CV < 20% 和 CV < 30%,而 Belg 季节的变异性非常高(CV > 30%)。贝加季的变率极高(CV > 70%)。相比之下,十年降雨量变异性通常很低(CV <10%)。10 月至次年 3 月的月际变率较高,CV 超过 100%。相比之下,基里姆季、七月和八月的月际变率较低(CV <30%)。亚的斯亚贝巴西部、东北部和南部地区的降雨量变异性相对较高,除 Kiremt 季节和 5 月、6 月和 9 月外,其他季节和月份的降雨量变异性均呈下降趋势。不过,这些季节和月份变化均无统计学意义(P > 0.05)。研究发现有 6 个年份(1982、1984、1997、1999、2014 和 2015 年)出现了不同程度的干旱。因此,在发展计划、减少灾害风险战略和洪水管理等政策措施中应考虑降水的时空变化。
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来源期刊
Applied Geomatics
Applied Geomatics REMOTE SENSING-
CiteScore
5.40
自引率
3.70%
发文量
61
期刊介绍: Applied Geomatics (AGMJ) is the official journal of SIFET the Italian Society of Photogrammetry and Topography and covers all aspects and information on scientific and technical advances in the geomatics sciences. The Journal publishes innovative contributions in geomatics applications ranging from the integration of instruments, methodologies and technologies and their use in the environmental sciences, engineering and other natural sciences. The areas of interest include many research fields such as: remote sensing, close range and videometric photogrammetry, image analysis, digital mapping, land and geographic information systems, geographic information science, integrated geodesy, spatial data analysis, heritage recording; network adjustment and numerical processes. Furthermore, Applied Geomatics is open to articles from all areas of deformation measurements and analysis, structural engineering, mechanical engineering and all trends in earth and planetary survey science and space technology. The Journal also contains notices of conferences and international workshops, industry news, and information on new products. It provides a useful forum for professional and academic scientists involved in geomatics science and technology. Information on Open Research Funding and Support may be found here: https://www.springernature.com/gp/open-research/institutional-agreements
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