Development of an improved hydrogeological and hydro-geochemical conceptualization of a complex aquifer system in Ethiopia

Shishaye, Haile Arefayne; Tait, Douglas R.; Befus, K. M.; Maher, Damien T.; Reading, Michael J.; Jeffrey, Luke C.; Tewolde, Tesfamichael; Asfaw, Asmelash T.

doi:10.1007/s10040-020-02229-4

Cited by 9 publications

(2 citation statements)

References 41 publications

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“…DA has been successfully applied in volcanic systems, combined with other multivariate methods (Barzegar et al 2019;Panagopoulos et al 2016) and machine learning procedures (Ha et al 2021;Sajedi-Hosseini et al 2018). Moreover, principal component analyses (PCA; Gan et al 2018;Panagopoulos et al 2016;Pazand and Javanshir 2016), correlation analyses (Morán-Ramírez et al 2016;Kim et al 2020), factor analysis (Gan et al 2018); hierarchical cluster analysis (Agbasi and Egbueri 2022;Egbueri 2020;Gan et al 2018); hydrochemical diagrams (Ebrahimi et al 2022;Fenta et al 2020;Hosono et al 2020;Shishaye et al 2020;Wisitthammasri et al 2020), base exchange indices (Haji et al 2021;Mechal et al 2017), multiple linear regression (Egbueri and Agbasi 2022), and the assessment of saturation indexes of aqueous mineral phases (Esteller et al 2017;Hosono et al 2020;Morán-Ramírez et al 2016) are widely employed to facilitate the interpretation of geochemical processes with large hydrochemical data series in volcanic aquifers.…”

Section: Introductionmentioning

confidence: 99%

Discriminant model and hydrogeochemical processes for characterizing preferential flow paths in four interconnected volcanic aquifers in Costa Rica

et al. 2022

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The volcanic Barva and Colima multiaquifer system is crucial for the drinking water supply of about 1.7 million people, about 30% of the population in Costa Rica. The complexity of this system and the simultaneous occurrence of anthropogenic and natural processes complicate the understanding of hydrochemical and hydrogeological dynamics, both essential for groundwater protection. This research aimed to develop a model for the discrimination of groundwaters according to the main withdrawn aquifer and flow path, assess interaquifer connections, and evaluate the main hydrochemical processes governing water quality. Samples (571) from 38 sampling sites, collected quarterly from 2016 to 2020, were analyzed for nitrate, major ions, and silica. Principal component analysis and discriminant analysis exhibited and validated sample grouping according to the primary aquifer system captured, i.e., Upper Barva, Lower Barva, Upper Colima, and Lower Colima, and the occurrence of two flow paths within the Lower Barva and Upper Colima aquifers. Hydrochemical and statistical analyses showed resilience to seasonal chemical variation in deeper aquifers and also three groundwater mixing processes. Lower Barva groundwater enriches in bicarbonate, magnesium, calcium, sodium, and silica, mainly due to weathering of mafic andesitic-basaltic lavas. The Upper and Lower Colima showed higher silica and major ion content, except for calcium, indicating longer residence times, dissolution from felsic andesitic minerals, and calcium adsorption by normal ion exchange. Weathering of aluminosilicates is the primary process governing groundwater quality in the four studied aquifers, whereas cation exchange, interaquifer leakage, and anthropogenic processes might modify the groundwater chemistry.

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Section: Introductionmentioning

confidence: 99%

Discriminant model and hydrogeochemical processes for characterizing preferential flow paths in four interconnected volcanic aquifers in Costa Rica

et al. 2022

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“…With the increased computing power and advanced 3D numerical models, datasets such as drill logs and geo-electrical resistivity data are used as input to construct detailed 3D geological models of groundwater flow systems [20,23]. For example, drill log and vertical electrical sounding (VES) data were combined to construct 3D geological models of a groundwater basin and it was reported that the combined method improved the representation of the groundwater flow system and reduced model uncertainties [21,[30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Using an Open-Source Tool to Develop a Three-Dimensional Hydrogeologic Framework of the Kobo Valley, Ethiopia

Mekonen,

Boyce,

Mohammed

et al. 2023

Geosciences

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Groundwater resource management requires understanding the groundwater basin’s hydrogeology and would be improved with the development of a three-dimensional hydrogeologic framework model (HFM). A wide range of methods and software exist to quantify the extent, structure, and properties of geologic systems. However, most geologic software is proprietary and cost-prohibitive for use in developing countries. GemPy is a Python-based, open-source (no-cost) tool for generating three-dimensional geological models. This study uses available data and GemPy to develop the Kobo Valley Hydrogeologic Framework Model (KV-HFM), a three-dimensional HFM for Kobo Valley in northern Ethiopia, which is part of the East African Rift System. The KV-HFM is a conceptual model that comprises the hydrostratigraphy, structural features, and hydraulic properties of the Kobo Valley groundwater system. The limited data described the extent and altitude of the hydrostratigraphic units using the GemPy implicit potential–field interpolation. The KV-HFM showed the existence of an east-to-west, structural-based groundwater divide composed of volcanic rock and clay. This divide splits the catchment into two groundwater systems with limited interconnected flow. This study illustrates the use of open-source software for developing an HFM using sparse, existing geologic data.

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Analysis of spatio-temporal variability of groundwater storage in Ethiopia using Gravity Recovery and Climate Experiment (GRACE) data

Arega,

Birhanu,

Ali

et al. 2024

Environ Earth Sci

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Development of an improved hydrogeological and hydro-geochemical conceptualization of a complex aquifer system in Ethiopia

Cited by 9 publications

References 41 publications

Discriminant model and hydrogeochemical processes for characterizing preferential flow paths in four interconnected volcanic aquifers in Costa Rica

Discriminant model and hydrogeochemical processes for characterizing preferential flow paths in four interconnected volcanic aquifers in Costa Rica

Using an Open-Source Tool to Develop a Three-Dimensional Hydrogeologic Framework of the Kobo Valley, Ethiopia

Analysis of spatio-temporal variability of groundwater storage in Ethiopia using Gravity Recovery and Climate Experiment (GRACE) data

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