Regional groundwater flow modeling of the Geba basin, northern Ethiopia

Gebreyohannes, Tesfamichael; Smedt, Florimond De; Walraevens, Kristine; Gebresilassie, Solomon; Hussien, Abdelwassie; Hagos, Miruts; Amare, Kassa; Deckers, Jozef; Gebrehiwot, Kindeya

doi:10.1007/s10040-016-1522-8

Cited by 28 publications

(17 citation statements)

References 22 publications

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“…The Suluh River is a permanent river flowing from north to south through the tabia. Suluh River is part of Geba catchment, covering an area of some 5260 m 2 (Gebreyohannes, ). The Geba River flows towards the Tekeze River, which is a tributary of the Atbara River, discharging into the Blue Nile.…”

Section: Methodsmentioning

confidence: 99%

“…The plain is surrounded by outcrops of Adigrat Sandstone. Further north, the regional east–west Wukro‐Senkata normal fault (belonging to the Wukro fault belt) is lifting the metavolcanics of the Precambrian basement up to the surface, while further south, the Upper Jurassic Antalo Limestone crops out (Gebreyohannes, ; Gebreyohannes et al ., ). Along the southern boundary of the loamy‐sand deposits, at the transition to the Adigrat Sandstone outcrops, a secondary fault was mapped by Ronsse (), deduced from satellite images interpretation.…”

Section: Methodsmentioning

confidence: 99%

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Water Balance Components for Sustainability Assessment of Groundwater‐Dependent Agriculture: Example of the Mendae Plain (Tigray, Ethiopia)

et al. 2015

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Mendae Plain at Abraha Atsbaha (Tigray Region, northern Ethiopia) is an agricultural area, which has been very drought-prone in the past. In the last decade, agricultural development has boosted because of the intensive use of large diameter wells that tap the phreatic aquifer. Pumped water is used for irrigation during the long dry season (October to May). Since 15 years, water harvesting measures have been implemented, mainly in the form of infiltration ponds and trenches that enhance local infiltration of rainfall runoff from hillslopes. To investigate the sustainability of the groundwater exploitation and the efficiency of the measures, the different recharge and discharge components of the water balance of data-scarce Mendae Plain have been identified and quantified, using different methods. Diffuse aquifer recharge is calculated from a soil moisture balance, based on meteorological data, and with the chloride mass balance method, based on groundwater analyses. Diffuse recharge is much higher on cultivated land plots than on non-cultivated bare soils. Rainfall infiltration in ponds and trenches is estimated based on the inflow catchment derived from the topography. Groundwater flow to a nearby river is obtained by balancing inflow and outflow by the other components over an 11 year period. The balance components are integrated into a lumped parameter model that was run for the period from 2000 to 2010. The results show that infiltration in ponds and trenches contributes between 30 and nearly 50% of total aquifer recharge, with the highest values in dry years. Changes in aquifer storage over time are an indicator for the evolution of groundwater levels in the aquifer and confirm the occurrence of two dry periods in

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Water Balance Components for Sustainability Assessment of Groundwater‐Dependent Agriculture: Example of the Mendae Plain (Tigray, Ethiopia)

et al. 2015

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“…To calibrate a larger-scale groundwater model, fitting at local scale is not enough; overall scope fitting is also necessary. Groundwater flow-field fitting and a groundwater budget were used in various ways to calibrate regional models by He et al [12] and Gebreyohannes et al [20]. Apparently, more constraints must be used to advance the calibration and validation of numerical groundwater models.…”

Section: Introductionmentioning

confidence: 99%

Improving the Reliability of Numerical Groundwater Modeling in a Data-Sparse Region

Hou

et al. 2018

Water

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Abstract:In data-sparse areas, due to the lack of hydrogeological data, numerical groundwater models have some uncertainties. In this paper, a nested model and a multi-index calibration method are used to improve the reliability of a numerical groundwater model in a data-sparse region, the Nalinggele River catchment in the Qaidam Basin. Referencing this key study area, a regional three-dimensional groundwater flow model is developed in a relatively complete hydrogeological unit. A complex set of calibration indices, including groundwater fitting errors, dynamic groundwater trends, spring discharges, overflow zone location, and groundwater budget status, are proposed to calibrate the regional numerical groundwater model in the Nalinggele alluvial-proluvial fan. Constrained by regional groundwater modeling results, a local-scale groundwater model is developed, and the hydrogeological parameters are investigated to improve modeling accuracy and reliability in this data-sparse region.

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“…Moeck et al [21] developed a 3D groundwater model for simulating existing and proposed water management strategies as a tool to ensure the utmost security for drinking water in Basel, Switzerland. Gebreyohannes et al [22] developed regional groundwater flow model for Geba Basin, northern Ethiopia, and reported that none of the hydrogeological formations can be exploited for large-scale groundwater exploitation. Rahmawati et al [23] conducted research to study saltwater intrusion from 1995 to 2108 in Semarang city based on well log data and MODFLOW numerical model was used.…”

Section: Introductionmentioning

confidence: 99%

Regional Groundwater Quality Management through Hydrogeological Modeling in LCC, West Faisalabad, Pakistan

Shakoor¹,

Khan²,

Arshad³

et al. 2017

Journal of Chemistry

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The intensive abstraction of groundwater is causing a number of problems such as groundwater depletion and quality deterioration. To manage such problems, the data of 256 piezometers regarding groundwater levels and quality were acquired for the period of 2003 to 2012 in command area of Lower Chenab Canal (LCC), West Faisalabad, Pakistan. MODFLOW and MT3D models were calibrated for the period of 2003-2007 and validated for years 2008-2012 with respect to observed groundwater levels and quality data, respectively. After the successful calibration and validation, two pumping scenarios were developed up to year 2030: Scenario I (increase in pumping rate according to the historical trend) and Scenario II (adjusted canal water supplies and groundwater patterns). The predicted results of Scenario I revealed that, up to year 2030, the area under good quality groundwater reduced significantly from 50.35 to 28.95%, while marginal and hazardous groundwater quality area increased from 49.65 to 71.06%. Under Scenario II, the good quality groundwater area increased to 6.32% and 12.48% area possesses less hazardous quality of groundwater. It was concluded that the canal water supply should shift from good quality aquifer zone to poor quality aquifer zone for proficient management of groundwater at the study area.

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Regional groundwater flow modeling of the Geba basin, northern Ethiopia

Cited by 28 publications

References 22 publications

Water Balance Components for Sustainability Assessment of Groundwater‐Dependent Agriculture: Example of the Mendae Plain (Tigray, Ethiopia)

Water Balance Components for Sustainability Assessment of Groundwater‐Dependent Agriculture: Example of the Mendae Plain (Tigray, Ethiopia)

Improving the Reliability of Numerical Groundwater Modeling in a Data-Sparse Region

Regional Groundwater Quality Management through Hydrogeological Modeling in LCC, West Faisalabad, Pakistan

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