Three-dimensional groundwater flow modeling to assess the impacts of the increase in abstraction and recharge reduction on the groundwater, groundwater availability and groundwater-surface waters interaction: A case of the rib catchment in the Lake Tana sub-basin of the Upper Blue Nile River, Ethiopia
Study region: Rib catchment in the Lake Tana sub-basin, Upper Blue Nile River, Ethiopia. Study focus: This paper aimed to assess the impacts of future increase in abstraction and recharge reduction on the groundwater, groundwater availability, and groundwater-surface waters interaction based on a th...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-06-01
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| Series: | Journal of Hydrology: Regional Studies |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581821000604 |
| _version_ | 1818607564956368896 |
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| author | Sileshi Mamo Behailu Birhanu Tenalem Ayenew Getnet Taye |
| author_facet | Sileshi Mamo Behailu Birhanu Tenalem Ayenew Getnet Taye |
| author_sort | Sileshi Mamo |
| collection | DOAJ |
| description | Study region: Rib catchment in the Lake Tana sub-basin, Upper Blue Nile River, Ethiopia. Study focus: This paper aimed to assess the impacts of future increase in abstraction and recharge reduction on the groundwater, groundwater availability, and groundwater-surface waters interaction based on a three-dimensional groundwater flow modeling. Calibration was made under the steady state condition. Scenario analysis performed for 1) increase in abstraction, 2) decrease in recharge, 3) the worst-case scenario that combined the aforementioned two scenarios and with additional extraction for irrigation, and 4) for the optimal-case scenario, which considers 5% recharge increase for the worst-case scenario model. New hydrological insights for the region: It is found that the groundwater flows from uplands toward the Tana Lake. The total inflow to and outflow from the system in the calibrated model are 1733480 m3/d and 1840451 m3/d, respectively. Groundwater level drop, reduction in base flows to surface waters, and in evapotranspiration flux compared to the calibrated values encountered for all scenarios, which are significant (mean 38.4 m, 28.5–100 %, and 97.8 %, respectively) for the worst-case scenario. On the other hand, an increase in groundwater level (mean 9.8 m), base flows (0–14.4 %), and evapotranspiration flux (29.5 %) observed for the optimal scenario when compared to the worst-case scenario results. Results suggest that groundwater management measures should be implemented to mitigate the impacts. |
| first_indexed | 2024-12-16T14:28:46Z |
| format | Article |
| id | doaj.art-b20fa89c55c34da7985ff269b5cc7642 |
| institution | Directory Open Access Journal |
| issn | 2214-5818 |
| language | English |
| last_indexed | 2024-12-16T14:28:46Z |
| publishDate | 2021-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj.art-b20fa89c55c34da7985ff269b5cc76422022-12-21T22:28:17ZengElsevierJournal of Hydrology: Regional Studies2214-58182021-06-0135100831Three-dimensional groundwater flow modeling to assess the impacts of the increase in abstraction and recharge reduction on the groundwater, groundwater availability and groundwater-surface waters interaction: A case of the rib catchment in the Lake Tana sub-basin of the Upper Blue Nile River, EthiopiaSileshi Mamo0Behailu Birhanu1Tenalem Ayenew2Getnet Taye3Department of Geology, School of Earth Sciences, Bahir Dar University, P.O. Box: 79, Bahir Dar, Ethiopia; Corresponding author.Geology Department, College of Applied Sciences, Addis Ababa Sciences and Technology University, P.O. Box: 16417, Addis Ababa, EthiopiaSchool of Earth Sciences, Addis Ababa University, P.O. Box: 1176, Addis Ababa, EthiopiaDepartment of Geology, School of Earth Sciences, Bahir Dar University, P.O. Box: 79, Bahir Dar, EthiopiaStudy region: Rib catchment in the Lake Tana sub-basin, Upper Blue Nile River, Ethiopia. Study focus: This paper aimed to assess the impacts of future increase in abstraction and recharge reduction on the groundwater, groundwater availability, and groundwater-surface waters interaction based on a three-dimensional groundwater flow modeling. Calibration was made under the steady state condition. Scenario analysis performed for 1) increase in abstraction, 2) decrease in recharge, 3) the worst-case scenario that combined the aforementioned two scenarios and with additional extraction for irrigation, and 4) for the optimal-case scenario, which considers 5% recharge increase for the worst-case scenario model. New hydrological insights for the region: It is found that the groundwater flows from uplands toward the Tana Lake. The total inflow to and outflow from the system in the calibrated model are 1733480 m3/d and 1840451 m3/d, respectively. Groundwater level drop, reduction in base flows to surface waters, and in evapotranspiration flux compared to the calibrated values encountered for all scenarios, which are significant (mean 38.4 m, 28.5–100 %, and 97.8 %, respectively) for the worst-case scenario. On the other hand, an increase in groundwater level (mean 9.8 m), base flows (0–14.4 %), and evapotranspiration flux (29.5 %) observed for the optimal scenario when compared to the worst-case scenario results. Results suggest that groundwater management measures should be implemented to mitigate the impacts.http://www.sciencedirect.com/science/article/pii/S2214581821000604Groundwater rechargeGroundwater flowGroundwater-surface waters interactionModelingRib catchmentEthiopia |
| spellingShingle | Sileshi Mamo Behailu Birhanu Tenalem Ayenew Getnet Taye Three-dimensional groundwater flow modeling to assess the impacts of the increase in abstraction and recharge reduction on the groundwater, groundwater availability and groundwater-surface waters interaction: A case of the rib catchment in the Lake Tana sub-basin of the Upper Blue Nile River, Ethiopia Journal of Hydrology: Regional Studies Groundwater recharge Groundwater flow Groundwater-surface waters interaction Modeling Rib catchment Ethiopia |
| title | Three-dimensional groundwater flow modeling to assess the impacts of the increase in abstraction and recharge reduction on the groundwater, groundwater availability and groundwater-surface waters interaction: A case of the rib catchment in the Lake Tana sub-basin of the Upper Blue Nile River, Ethiopia |
| title_full | Three-dimensional groundwater flow modeling to assess the impacts of the increase in abstraction and recharge reduction on the groundwater, groundwater availability and groundwater-surface waters interaction: A case of the rib catchment in the Lake Tana sub-basin of the Upper Blue Nile River, Ethiopia |
| title_fullStr | Three-dimensional groundwater flow modeling to assess the impacts of the increase in abstraction and recharge reduction on the groundwater, groundwater availability and groundwater-surface waters interaction: A case of the rib catchment in the Lake Tana sub-basin of the Upper Blue Nile River, Ethiopia |
| title_full_unstemmed | Three-dimensional groundwater flow modeling to assess the impacts of the increase in abstraction and recharge reduction on the groundwater, groundwater availability and groundwater-surface waters interaction: A case of the rib catchment in the Lake Tana sub-basin of the Upper Blue Nile River, Ethiopia |
| title_short | Three-dimensional groundwater flow modeling to assess the impacts of the increase in abstraction and recharge reduction on the groundwater, groundwater availability and groundwater-surface waters interaction: A case of the rib catchment in the Lake Tana sub-basin of the Upper Blue Nile River, Ethiopia |
| title_sort | three dimensional groundwater flow modeling to assess the impacts of the increase in abstraction and recharge reduction on the groundwater groundwater availability and groundwater surface waters interaction a case of the rib catchment in the lake tana sub basin of the upper blue nile river ethiopia |
| topic | Groundwater recharge Groundwater flow Groundwater-surface waters interaction Modeling Rib catchment Ethiopia |
| url | http://www.sciencedirect.com/science/article/pii/S2214581821000604 |
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