Long-term spatiotemporal dynamics of groundwater storage in the data-scarce region: Tana sub-basin, Ethiopia
Imprudent extraction of groundwater tends to undue stress and portends its sustainability. Spatiotemporal analysis of groundwater storage anomaly (GWSA) is imperative for the judicious use, management, and sustainable development of a region. This study aimed to examine the changes in groundwater st...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-02-01
|
| Series: | Heliyon |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S240584402400505X |
| _version_ | 1827348421402427392 |
|---|---|
| author | Kibru Gedam Berhanu Tarun Kumar Lohani Samuel Dagalo Hatiye |
| author_facet | Kibru Gedam Berhanu Tarun Kumar Lohani Samuel Dagalo Hatiye |
| author_sort | Kibru Gedam Berhanu |
| collection | DOAJ |
| description | Imprudent extraction of groundwater tends to undue stress and portends its sustainability. Spatiotemporal analysis of groundwater storage anomaly (GWSA) is imperative for the judicious use, management, and sustainable development of a region. This study aimed to examine the changes in groundwater storage over the past 20 years in the Tana sub-basin using Gravity Recovery and Climate Experiment (GRACE) assimilated into Global Land Data Assimilation Systems (GLDAS). Validation analysis was carried out to evaluate the accuracy of GWSA against anomalies of Lake Tana water level, precipitation, and in-situ groundwater level. Modified Mann-Kendal test and Sen's slope estimator were applied for trend analysis of the GWSA. The results exhibited that GWSA strongly correlated (Pearson's correlation coefficient, R ranges from 0.75 to 0.96) with the three validation above variables, which elucidated in general, credible GWSA estimation. The net annual GWSA curve showed a non-significant (p > 0.05) decreasing trend from 2003 to 2012. However, years including 2005, 2006, and 2009 were drought periods, which caused 0.49 billion cubic meters (BCM) groundwater loss. In the entire study period (2003–2022), on the other hand, the net annual GWSA revealed a significant increasing trend (p < 0.05) with a rate of 0.333 cm/year. Generally, the Tana sub-basin was nurtured with a net 4.87 BCM groundwater gain in the study period. The most sensitive parts of the study area to large fluctuations of groundwater storage were mainly the nearby southern and eastern directions of Lake Tana. |
| first_indexed | 2024-03-08T00:12:00Z |
| format | Article |
| id | doaj.art-48d4dd75017b4b7a91b4c83a0f377ccf |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-03-08T00:12:00Z |
| publishDate | 2024-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-48d4dd75017b4b7a91b4c83a0f377ccf2024-02-17T06:38:11ZengElsevierHeliyon2405-84402024-02-01103e24474Long-term spatiotemporal dynamics of groundwater storage in the data-scarce region: Tana sub-basin, EthiopiaKibru Gedam Berhanu0Tarun Kumar Lohani1Samuel Dagalo Hatiye2Arba Minch Water Technology Institute, Faculty of Water Resources and Irrigation Engineering, Arba Minch University, Arba Minch, Ethiopia; Corresponding author.Arba Minch Water Technology Institute, Faculty of Hydraulic and Water Resources Engineering, Arba Minch University, Arba Minch, EthiopiaArba Minch Water Technology Institute, Faculty of Water Resources and Irrigation Engineering, Arba Minch University, Arba Minch, EthiopiaImprudent extraction of groundwater tends to undue stress and portends its sustainability. Spatiotemporal analysis of groundwater storage anomaly (GWSA) is imperative for the judicious use, management, and sustainable development of a region. This study aimed to examine the changes in groundwater storage over the past 20 years in the Tana sub-basin using Gravity Recovery and Climate Experiment (GRACE) assimilated into Global Land Data Assimilation Systems (GLDAS). Validation analysis was carried out to evaluate the accuracy of GWSA against anomalies of Lake Tana water level, precipitation, and in-situ groundwater level. Modified Mann-Kendal test and Sen's slope estimator were applied for trend analysis of the GWSA. The results exhibited that GWSA strongly correlated (Pearson's correlation coefficient, R ranges from 0.75 to 0.96) with the three validation above variables, which elucidated in general, credible GWSA estimation. The net annual GWSA curve showed a non-significant (p > 0.05) decreasing trend from 2003 to 2012. However, years including 2005, 2006, and 2009 were drought periods, which caused 0.49 billion cubic meters (BCM) groundwater loss. In the entire study period (2003–2022), on the other hand, the net annual GWSA revealed a significant increasing trend (p < 0.05) with a rate of 0.333 cm/year. Generally, the Tana sub-basin was nurtured with a net 4.87 BCM groundwater gain in the study period. The most sensitive parts of the study area to large fluctuations of groundwater storage were mainly the nearby southern and eastern directions of Lake Tana.http://www.sciencedirect.com/science/article/pii/S240584402400505XGroundwater storage changeSpatiotemporalGRACEGLDASTrend analysisTana sub-basin |
| spellingShingle | Kibru Gedam Berhanu Tarun Kumar Lohani Samuel Dagalo Hatiye Long-term spatiotemporal dynamics of groundwater storage in the data-scarce region: Tana sub-basin, Ethiopia Heliyon Groundwater storage change Spatiotemporal GRACE GLDAS Trend analysis Tana sub-basin |
| title | Long-term spatiotemporal dynamics of groundwater storage in the data-scarce region: Tana sub-basin, Ethiopia |
| title_full | Long-term spatiotemporal dynamics of groundwater storage in the data-scarce region: Tana sub-basin, Ethiopia |
| title_fullStr | Long-term spatiotemporal dynamics of groundwater storage in the data-scarce region: Tana sub-basin, Ethiopia |
| title_full_unstemmed | Long-term spatiotemporal dynamics of groundwater storage in the data-scarce region: Tana sub-basin, Ethiopia |
| title_short | Long-term spatiotemporal dynamics of groundwater storage in the data-scarce region: Tana sub-basin, Ethiopia |
| title_sort | long term spatiotemporal dynamics of groundwater storage in the data scarce region tana sub basin ethiopia |
| topic | Groundwater storage change Spatiotemporal GRACE GLDAS Trend analysis Tana sub-basin |
| url | http://www.sciencedirect.com/science/article/pii/S240584402400505X |
| work_keys_str_mv | AT kibrugedamberhanu longtermspatiotemporaldynamicsofgroundwaterstorageinthedatascarceregiontanasubbasinethiopia AT tarunkumarlohani longtermspatiotemporaldynamicsofgroundwaterstorageinthedatascarceregiontanasubbasinethiopia AT samueldagalohatiye longtermspatiotemporaldynamicsofgroundwaterstorageinthedatascarceregiontanasubbasinethiopia |