Rainfall variability and trends in the Borana zone of southern Ethiopia
This paper has examined the variability and trends of rainfall in the Borana zone, southern Ethiopia. Monthly rainfall data from 1981 to 2018 were obtained from the National Meteorological Agency (NMA) of Ethiopia. Mean, standard deviation and coefficient of variation were employed to analyze tempor...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-08-01
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| Series: | Journal of Water and Climate Change |
| Subjects: | |
| Online Access: | http://jwcc.iwaponline.com/content/13/8/3132 |
| _version_ | 1818064073865035776 |
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| author | Mitiku Adisu Worku Gudina Legese Feyisa Kassahun Ture Beketie Emmanuel Garbolino |
| author_facet | Mitiku Adisu Worku Gudina Legese Feyisa Kassahun Ture Beketie Emmanuel Garbolino |
| author_sort | Mitiku Adisu Worku |
| collection | DOAJ |
| description | This paper has examined the variability and trends of rainfall in the Borana zone, southern Ethiopia. Monthly rainfall data from 1981 to 2018 were obtained from the National Meteorological Agency (NMA) of Ethiopia. Mean, standard deviation and coefficient of variation were employed to analyze temporal variability. Mann–Kendall (MK) test and Sen's slope estimator (SEE) were used to determine trend and its magnitude, respectively. The inverse weighting distance (IDW) interpolation technique was employed to generate surface data and produce spatial rainfall maps. April and Belg were the wettest month and season, respectively. On an annual basis, Arero (741 mm) followed by Teltele (629 mm) were the wettest stations, whereas the Dillo station (285 mm) was the driest. Rainfall is highly variable on a monthly and seasonal basis than annual timescale. Meher rainfall has shown a significant rainfall increase (P-value <0.05) at most stations. A significant increase in annual rainfall was observed at Arero, Dehas, Dillo and Miyo. Spatially, rainfall decreases from the northeast and northwest parts of the Borana towards the southwest. The findings of this study can serve as a reference basis and provides useful information for policymakers to devise and implement better water management strategies in this water-scarce region.
HIGHLIGHTS
There is no similar study conducted in the study area.;
The region is a drought-prone affecting the biophysical and socio-economic systems.;
The paper is conducted at a micro-scale (station) level which is not a common approach.;
Communities outside the study region are unable to know the climate characteristics of the region.;
Policymakers and concerned bodies can devise better water management strategies.; |
| first_indexed | 2024-12-10T14:30:12Z |
| format | Article |
| id | doaj.art-4563be95148342e3961754d5543b9456 |
| institution | Directory Open Access Journal |
| issn | 2040-2244 2408-9354 |
| language | English |
| last_indexed | 2024-12-10T14:30:12Z |
| publishDate | 2022-08-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Journal of Water and Climate Change |
| spelling | doaj.art-4563be95148342e3961754d5543b94562022-12-22T01:44:57ZengIWA PublishingJournal of Water and Climate Change2040-22442408-93542022-08-011383132315110.2166/wcc.2022.173173Rainfall variability and trends in the Borana zone of southern EthiopiaMitiku Adisu Worku0Gudina Legese Feyisa1Kassahun Ture Beketie2Emmanuel Garbolino3 Department of Environment and Climate Change, Ethiopian Civil Service University, Addis Ababa, Ethiopia Center for Environmental Science, Addis Ababa University, Addis Ababa, Ethiopia Center for Environmental Science, Addis Ababa University, Addis Ababa, Ethiopia ASES France R&D/Climpact Data Science Company, Nova Sophia, France This paper has examined the variability and trends of rainfall in the Borana zone, southern Ethiopia. Monthly rainfall data from 1981 to 2018 were obtained from the National Meteorological Agency (NMA) of Ethiopia. Mean, standard deviation and coefficient of variation were employed to analyze temporal variability. Mann–Kendall (MK) test and Sen's slope estimator (SEE) were used to determine trend and its magnitude, respectively. The inverse weighting distance (IDW) interpolation technique was employed to generate surface data and produce spatial rainfall maps. April and Belg were the wettest month and season, respectively. On an annual basis, Arero (741 mm) followed by Teltele (629 mm) were the wettest stations, whereas the Dillo station (285 mm) was the driest. Rainfall is highly variable on a monthly and seasonal basis than annual timescale. Meher rainfall has shown a significant rainfall increase (P-value <0.05) at most stations. A significant increase in annual rainfall was observed at Arero, Dehas, Dillo and Miyo. Spatially, rainfall decreases from the northeast and northwest parts of the Borana towards the southwest. The findings of this study can serve as a reference basis and provides useful information for policymakers to devise and implement better water management strategies in this water-scarce region. HIGHLIGHTS There is no similar study conducted in the study area.; The region is a drought-prone affecting the biophysical and socio-economic systems.; The paper is conducted at a micro-scale (station) level which is not a common approach.; Communities outside the study region are unable to know the climate characteristics of the region.; Policymakers and concerned bodies can devise better water management strategies.;http://jwcc.iwaponline.com/content/13/8/3132borana zonemann–kendall testrainfall variabilitysen's slope estimatortrend |
| spellingShingle | Mitiku Adisu Worku Gudina Legese Feyisa Kassahun Ture Beketie Emmanuel Garbolino Rainfall variability and trends in the Borana zone of southern Ethiopia Journal of Water and Climate Change borana zone mann–kendall test rainfall variability sen's slope estimator trend |
| title | Rainfall variability and trends in the Borana zone of southern Ethiopia |
| title_full | Rainfall variability and trends in the Borana zone of southern Ethiopia |
| title_fullStr | Rainfall variability and trends in the Borana zone of southern Ethiopia |
| title_full_unstemmed | Rainfall variability and trends in the Borana zone of southern Ethiopia |
| title_short | Rainfall variability and trends in the Borana zone of southern Ethiopia |
| title_sort | rainfall variability and trends in the borana zone of southern ethiopia |
| topic | borana zone mann–kendall test rainfall variability sen's slope estimator trend |
| url | http://jwcc.iwaponline.com/content/13/8/3132 |
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