Challenges in developing a global gradient-based groundwater model (G3M v1.0) for the integration into a global hydrological model

Publication type:
Journal article
Metadata:
Autoren
  • Robert Reinecke
  • Laura Foglia
  • Steffen Mehl
  • Tim Trautmann
  • Denise Caceres
  • Petra Doell
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000472079300002&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/gmd-12-2401-2019
eISSN
1991-9603
Externe Identifier
  • Clarivate Analytics Document Solution ID: IE0LV
ISSN
1991-959X
Ausgabe der Veröffentlichung
6
Zeitschrift
GEOSCIENTIFIC MODEL DEVELOPMENT
Paginierung
2401 - 2418
Datum der Veröffentlichung
2019
Status
Published
Titel
Challenges in developing a global gradient-based groundwater model (G<SUP>3</SUP>M v1.0) for the integration into a global hydrological model
Sub types
  • Article
Ausgabe der Zeitschrift
12

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:p>Abstract. In global hydrological models, groundwater (GW) is typically represented by a bucket-like linear groundwater reservoir. Reservoir models, however, (1) can only simulate GW discharge to surface water (SW) bodies but not recharge from SW to GW, (2) provide no information on the location of the GW table, and (3) assume that there is no GW flow among grid cells. This may lead, for example, to an underestimation of groundwater resources in semiarid areas where GW is often replenished by SW or to an underestimation of evapotranspiration where the GW table is close to the land surface. To overcome these limitations, it is necessary to replace the reservoir model in global hydrological models with a hydraulic head gradient-based GW flow model. We present G3M, a new global gradient-based GW model with a spatial resolution of 5′ (arcminutes), which is to be integrated into the 0.5∘ WaterGAP Global Hydrology Model (WGHM). The newly developed model framework enables in-memory coupling to WGHM while keeping overall runtime relatively low, which allows sensitivity analyses, calibration, and data assimilation. This paper presents the G3M concept and model design decisions that are specific to the large grid size required for a global-scale model. Model results under steady-state naturalized conditions, i.e., neglecting GW abstractions, are shown. Simulated hydraulic heads show better agreement to observations around the world compared to the model output of de Graaf et al. (2015). Locations of simulated SW recharge to GW are found, as is expected, in dry and mountainous regions but areal extent of SW recharge may be underestimated. Globally, GW discharge to rivers is by far the dominant flow component such that lateral GW flows only become a large fraction of total diffuse and focused recharge in the case of losing rivers, some mountainous areas, and some areas with very low GW recharge. A strong sensitivity of simulated hydraulic heads to the spatial resolution of the model and the related choice of the water table elevation of surface water bodies was found. We suggest to investigate how global-scale groundwater modeling at 5′ spatial resolution can benefit from more highly resolved land surface elevation data. </jats:p>
Autoren
  • Robert Reinecke
  • Laura Foglia
  • Steffen Mehl
  • Tim Trautmann
  • Denise Cáceres
  • Petra Döll
DOI
10.5194/gmd-12-2401-2019
eISSN
1991-9603
Ausgabe der Veröffentlichung
6
Zeitschrift
Geoscientific Model Development
Sprache
en
Online publication date
2019
Paginierung
2401 - 2418
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/gmd-12-2401-2019
Datum der Datenerfassung
2020
Titel
Challenges in developing a global gradient-based groundwater model (G&amp;lt;sup&amp;gt;3&amp;lt;/sup&amp;gt;M v1.0) for the integration into a global hydrological model
Ausgabe der Zeitschrift
12

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