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Improving large-scale groundwater models by considering fossil gradients

Schulz, Stephan ; Walther, Marc ; Michelsen, Nils ; Rausch, Randolf ; Dirks, Heiko ; Al-Saud, Mohammed ; Merz, Ralf ; Kolditz, Olaf ; Schüth, Christoph (2017)
Improving large-scale groundwater models by considering fossil gradients.
In: Advances in Water Resources, 103
doi: 10.1016/j.advwatres.2017.02.010
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Due to limited availability of surface water, many arid to semi-arid countries rely on their groundwater resources. Despite the quasi-absence of present day replenishment, some of these groundwater bodies contain large amounts of water, which was recharged during pluvial periods of the Late Pleistocene to Early Holocene. These mostly fossil, non-renewable resources require different management schemes compared to those which are usually applied in renewable systems. Fossil groundwater is a finite resource and its withdrawal implies mining of aquifer storage reserves. Although they receive almost no recharge, some of them show notable hydraulic gradients and a flow towards their discharge areas, even without pumping. As a result, these systems have more discharge than recharge and hence are not in steady state, which makes their modelling, in particular the calibration, very challenging. In this study, we introduce a new calibration approach, composed of four steps: (i) estimating the fossil discharge component, (ii) determining the origin of fossil discharge, (iii) fitting the hydraulic conductivity with a pseudo steady-state model, and (iv) fitting the storage capacity with a transient model by reconstructing head drawdown induced by pumping activities. Finally, we test the relevance of our approach and evaluated the effect of considering or ignoring fossil gradients on aquifer parameterization for the Upper Mega Aquifer (UMA) on the Arabian Peninsula.

Typ des Eintrags: Artikel
Erschienen: 2017
Autor(en): Schulz, Stephan ; Walther, Marc ; Michelsen, Nils ; Rausch, Randolf ; Dirks, Heiko ; Al-Saud, Mohammed ; Merz, Ralf ; Kolditz, Olaf ; Schüth, Christoph
Art des Eintrags: Bibliographie
Titel: Improving large-scale groundwater models by considering fossil gradients
Sprache: Englisch
Publikationsjahr: Mai 2017
Verlag: Elsevier
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Advances in Water Resources
Jahrgang/Volume einer Zeitschrift: 103
DOI: 10.1016/j.advwatres.2017.02.010
URL / URN: https://www.sciencedirect.com/science/article/pii/S030917081...
Kurzbeschreibung (Abstract):

Due to limited availability of surface water, many arid to semi-arid countries rely on their groundwater resources. Despite the quasi-absence of present day replenishment, some of these groundwater bodies contain large amounts of water, which was recharged during pluvial periods of the Late Pleistocene to Early Holocene. These mostly fossil, non-renewable resources require different management schemes compared to those which are usually applied in renewable systems. Fossil groundwater is a finite resource and its withdrawal implies mining of aquifer storage reserves. Although they receive almost no recharge, some of them show notable hydraulic gradients and a flow towards their discharge areas, even without pumping. As a result, these systems have more discharge than recharge and hence are not in steady state, which makes their modelling, in particular the calibration, very challenging. In this study, we introduce a new calibration approach, composed of four steps: (i) estimating the fossil discharge component, (ii) determining the origin of fossil discharge, (iii) fitting the hydraulic conductivity with a pseudo steady-state model, and (iv) fitting the storage capacity with a transient model by reconstructing head drawdown induced by pumping activities. Finally, we test the relevance of our approach and evaluated the effect of considering or ignoring fossil gradients on aquifer parameterization for the Upper Mega Aquifer (UMA) on the Arabian Peninsula.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Hydrogeologie
11 Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 17 Apr 2018 12:48
Letzte Änderung: 17 Apr 2018 12:48
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