Hydrogeological and hydrochemical framework of Upper Awash River basin, Ethiopia: With special emphasis on inter-basins groundwater transfer between Blue Nile and Awash Rivers

Yitbarek, Andarge; Razack, Moumtaz; Ayenew, Tenalem; Zemedagegnehu, Engida; Azagegn, Tilahun

doi:10.1016/j.jafrearsci.2012.01.002

Cited by 56 publications

(34 citation statements)

References 8 publications

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“…This boundary across which regional inflow is taking place is imposed as constant influx boundary condition. The amount of this influx is equal to the outflow from Upper Awash basin (3.608 9 10 10 m 3 / year) determined by previous study (Yitbarek 2009). The eastern boundary across which outflow is taking place is considered as general head boundary (GHB) whereas the massive volcanic hills in south and northeast of the area which forms water divide with adjacent river basins are imposed as no flow boundaries of the model (Fig.…”

Section: Resultsmentioning

confidence: 75%

The hydrogeology of Adama-Wonji basin and assessment of groundwater level changes in Wonji wetland, Main Ethiopian Rift: results from 2D tomography and electrical sounding methods

et al. 2010

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Rise of groundwater level becomes an emerging concern at Wonji irrigation field, Main Ethiopian Rift. An integrated study based on geophysical resistivity methods is conducted at Wonji wetland to understand the link between irrigation water and the shallow aquifer system as well as to confirm the current concern of groundwater rise. The study was also intended to improve the uncertainty of understanding the hydrogeology of Wonji wetland including the extent and direction of groundwatersurface water interaction. The vertical and horizontal contacts between the different geological series of the Wonji area are resolved with 2D high-resolution geophysical imaging. Results from both VES and 2D tomography show low resistivity layers under Wonji irrigation field with narrow ranges in resistivity variation which corresponds to a homogeneous saturated layer. The geoelectric sections reveal two fault systems running NW-SE and N-S directions which impede lateral groundwater flow. Furthermore, groundwater is converged towards the Wonji irrigation site strained by these fault systems. The geophysical results show strong link between irrigation water and the shallow unconfined aquifer as well as among the local and regional flow systems.

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Section: Resultsmentioning

confidence: 75%

The hydrogeology of Adama-Wonji basin and assessment of groundwater level changes in Wonji wetland, Main Ethiopian Rift: results from 2D tomography and electrical sounding methods

et al. 2010

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“…A number of works to characterize aquifer properties, determine mechanism of groundwater flow and conceptualize the lateral and vertical extent of the aquifers were carried out supported by exploratory drillings, pumping test, hydrochemistry, stable isotopes of water and radioactive isotopes (Tsehayu et al 2005;Kebede et al 2007;Yitbarek 2009;Azagegn et al 2014). There works were very much important to numerically represent the study area.…”

Section: Study Areamentioning

confidence: 99%

“…Groundwater simulation models, lithostratigraphy, isotope hydrology and hydro-geochemistry were done either for part or for the whole Upper Awash (Kebede et al 2005;Tsehayu et al 2005;Oljira 2006;Kebede et al 2007;Tesfaye 2009;Yitbarek 2009;Yitbarek 2012Azagegn 2015 to quantify groundwater fluxes and analyze the hydrodynamics of the aquifer system. However, the combined modeling of groundwater resources and surface water supply reservoirs has never been done.…”

Section: Introductionmentioning

confidence: 99%

WEAP-MODFLOW dynamic modeling approach to evaluate surface water and groundwater supply sources of Addis Ababa city

et al. 2018

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riassunto: L'integrazione tra i modelli WEAP e MODFLOW accoppiati tramite LinkKitchen contribuisce a creare un collegamento dinamico tra le acque di superficie e le fonti di approvvigionamento idrico della città di Addis Abeba. I possibili impatti degli stress naturali e antropogenici sul volume dei bacini superficiali e sull'immagazzinamento delle acque sotterranee sono stati valutati attraverso scenari di approvvigionamento idrico. Le proiezioni indicano che la copertura della domanda idrica del 100% non sarà raggiunta per proiezioni di crescita della popolazione elevate (4,6%), medie (3,8%) e basse (2,8%), anche con tutti i progetti di approvvigionamento idrico previsti fino al 2025. Lo scenario indica che, poiché i bacini di acqua superficiali sono altamente sensibili ai cambiamenti climatici e alla variabilità, le fonti di approvvigionamento idrico sotterraneo delle città saranno notevolmente interessate dai progetti di approvvigionamento. Se l'estrazione di acqua sotterranea continuerà ad aumentare per soddisfare la domanda, nel 2025 sarà possibile registrare più di 30 metri di abbassamento del livello delle falde. Il modello è stato testato per prevedere l'effetto combinato degli stress naturali e antropogenici sulle fonti di approvvigionamento idrico della città, sia in condizioni ottimali, sia in condizioni peggiorative. Lo scenario ottimale si traduce in una domanda di acqua completamente soddisfatta nei mesi più umidi fino al 2025, con un probabile calo di circa 6 metri del livello della falda freatica. Lo scenario peggiore mostra che il soddisfacimento dell'idroesigenza sarà potenzialmente ridotto ad un massimo del 35% nel 2025, con una variabilità stagionale e annuale. Il legame dinamico tra i bacini di acqua di superficie e le fonti di approvvigionamento idrico sotterraneo aiuta a ottenere informazioni sulle potenziali conseguenze delle mutevoli condizioni naturali e antropogeniche in continua evoluzione sulle fonti di approvvigionamento idrico. Di conseguenza, la previsione delle future cospicue pressioni sull'acqua superficiale e sulle falde acquifere della città di Addis Abeba indica chiaramente che la pianificazione e lo sviluppo di fonti alternative di approvvigionamento idrico al di fuori del confine cittadino (bacino Awash) dovrebbero essere immediatamente avviate per rispondere alla domanda sempre crescente. Altrimenti, non solo Addis Abeba continuerà a non poter soddisfare la propria idroesigenza per gli anni a venire, ma anche le locali fonti di approvvigionamento idrico saranno gravemente colpite. Abstract:

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“…A more or less similar researches, in terms of aquifer characterization, setting appropriate pumping rate, describing surface and groundwater interactions and demonstrating potential consequences of a groundwater system developed in unregulated manner and under natural stress conditions include: [3] for the Adelle-Haromaya dry lakes catchment; [20] for Mihone sub basin in Raya valley; [21] for the Dire Dawa area; [22] for Lake Hawassa basin [23] and [24] for Upper and middle Awash river basin respectively; [25] and [26] of the Lake Tana basin, [27] and [28] of the Kobo Valley; [29] for Meki River catchment; [30] for Raya Valley; [31] for the Upper Awash and south eastern flank of Blue Nile basin. These modeling exercises helped in understanding the groundwater flow system of the different catchments and enlightened the importance of groundwater models in understanding groundwater flow under different hydrogeological environment and in studying groundwater and surface water interactions.…”

Section: Brief Reviewmentioning

confidence: 99%

Challenges of Groundwater Flow Model Calibration Using MODFLOW in Ethiopia: With Particular Emphasis to the Upper Awash River Basin

Berehanu¹,

Ayenew²,

Azagegn³

2017

GEP

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In this work, most important problems related to model calibration have been assessed using MODFLOW. Particular emphasis is given to the Upper Awash river basin where many boreholes have been drilled for municipal and industrial uses compared with other regions in Ethiopia. Static Water Level (SWL) records from water supply wells drilled for about 32 years in the Upper Awash basin is considered to illustrate the commonly used groundwater flow model calibration procedures and associated problems. The assumptions made in the modeling procedures to use SWL data collected over many years from water supply boreholes to calibrate steady state models is too much of an assumption. Alternatives on steady and pseudo transient model calibration approaches in data scarce areas based on logical assumptions and reasonable representation of groundwater systems has been suggested. Hence, numerical groundwater flow models may play the expected key role for the sustainable groundwater resource management of the country, which is solving practical groundwater related problems.

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Hydrogeological and hydrochemical framework of Upper Awash River basin, Ethiopia: With special emphasis on inter-basins groundwater transfer between Blue Nile and Awash Rivers

Cited by 56 publications

References 8 publications

The hydrogeology of Adama-Wonji basin and assessment of groundwater level changes in Wonji wetland, Main Ethiopian Rift: results from 2D tomography and electrical sounding methods

The hydrogeology of Adama-Wonji basin and assessment of groundwater level changes in Wonji wetland, Main Ethiopian Rift: results from 2D tomography and electrical sounding methods

WEAP-MODFLOW dynamic modeling approach to evaluate surface water and groundwater supply sources of Addis Ababa city

Challenges of Groundwater Flow Model Calibration Using MODFLOW in Ethiopia: With Particular Emphasis to the Upper Awash River Basin

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