Academic Journal
A comparative study of drought characteristics using meteorological drought indices over the central main Ethiopian Rift
| العنوان: | A comparative study of drought characteristics using meteorological drought indices over the central main Ethiopian Rift |
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| المؤلفون: | Wondimu T. Hailesilassie, Tenalem Ayenew, Sirak Tekleab |
| المصدر: | Hydrology Research, Vol 54, Iss 3, Pp 313-329 (2023) |
| بيانات النشر: | IWA Publishing, 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:River, lake, and water-supply engineering (General) LCC:Physical geography |
| مصطلحات موضوعية: | central main ethiopian rift, drought characteristics, drought index, trends, River, lake, and water-supply engineering (General), TC401-506, Physical geography, GB3-5030 |
| الوصف: | Droughts are defined by a prolonged absence of moisture. For making drought assessments, a drought index is a crucial tool. This study aims to compare drought characteristics across the Central Main Ethiopian Rift using three drought indices – the Standardized Precipitation Index (SPI), the Reconnaissance Drought Index (RDI), and the Standardized Precipitation Evapotranspiration Index (SPEI) – from 1980 to 2017 at six climate sites in spring, summer, and a 6-month period (March - August). With 1% and 5% significance levels, Modified Mann-Kendall and Sen's Slope Estimators were used to determine trend and magnitude, respectively. The temporal fluctuations of the three drought indices revealed that droughts are frequent, unpredictable, and random. Furthermore, they behaved similarly and had significant links. At most places, the drought indices found no significant trends. However, in the spring season, Butajira (by the three indices) and Wulbareg (by the SPI) showed significantly decreasing trends (increasing drought severity), with change rates ranging from −0.03 to −0.04/year. A comparison of drought characteristics revealed that droughts have become more severe and frequent in recent decades, with spring being more common than summer. This study, which employed a variety of drought indices, could assist water resource planners better understand drought events. HIGHLIGHTS Drought indices time series study offered important insight into how droughts varied over time from 1980 to 2017.; Drought parameters (frequency and severity) were examined over two distinct time periods (1980–1998 and 1999–2017).; Drought characteristics and trends revealed that the research area is more vulnerable to drought in the spring than in the summer at most sites.; |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1998-9563 2224-7955 |
| Relation: | http://hr.iwaponline.com/content/54/3/313; https://doaj.org/toc/1998-9563; https://doaj.org/toc/2224-7955 |
| DOI: | 10.2166/nh.2023.091 |
| URL الوصول: | https://doaj.org/article/2d5c48142dca40c0a7e91af2f1d797ee |
| رقم الانضمام: | edsdoj.2d5c48142dca40c0a7e91af2f1d797ee |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 19989563 22247955 |
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| DOI: | 10.2166/nh.2023.091 |