Spatially distributed sensitivity of simulated global groundwater heads and flows to hydraulic conductivity, groundwater recharge, and surface water body parameterization

Publication type:
Journal article
Metadata:
Autoren
  • Robert Reinecke
  • Laura Foglia
  • Steffen Mehl
  • Jonathan D Herman
  • Alexander Wachholz
  • Tim Trautmann
  • Petra Doell
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000497322000001&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/hess-23-4561-2019
eISSN
1607-7938
Externe Identifier
  • Clarivate Analytics Document Solution ID: JO1CC
ISSN
1027-5606
Ausgabe der Veröffentlichung
11
Zeitschrift
HYDROLOGY AND EARTH SYSTEM SCIENCES
Paginierung
4561 - 4582
Datum der Veröffentlichung
2019
Status
Published
Titel
Spatially distributed sensitivity of simulated global groundwater heads and flows to hydraulic conductivity, groundwater recharge, and surface water body parameterization
Sub types
  • Article
Ausgabe der Zeitschrift
23

Data source: Web of Science (Lite)

Other metadata sources:
Abstract
<jats:p>Abstract. In global hydrological models, groundwater storages and flows are generally simulated by linear reservoir models. Recently, the first global gradient-based groundwater models were developed in order to improve the representation of groundwater–surface-water interactions, capillary rise, lateral flows, and human water use impacts. However, the reliability of model outputs is limited by a lack of data and by uncertain model assumptions that are necessary due to the coarse spatial resolution. The impact of data quality is presented in this study by showing the sensitivity of a groundwater model to changes in the only available global hydraulic conductivity dataset. To better understand the sensitivity of model output to uncertain spatially distributed parameters, we present the first application of a global sensitivity method for a global-scale groundwater model using nearly 2000 steady-state model runs of the global gradient-based groundwater model G3M. By applying the Morris method in a novel domain decomposition approach that identifies global hydrological response units, spatially distributed parameter sensitivities are determined for a computationally expensive model. Results indicate that globally simulated hydraulic heads are equally sensitive to hydraulic conductivity, groundwater recharge, and surface water body elevation, though parameter sensitivities vary regionally. For large areas of the globe, rivers are simulated to be either losing or gaining, depending on the parameter combination, indicating a high uncertainty in simulating the direction of flow between the two compartments. Mountainous and dry regions show a high variance in simulated head due to numerical instabilities of the model, limiting the reliability of computed sensitivities in these regions. This is likely caused by the uncertainty in surface water body elevation. We conclude that maps of spatially distributed sensitivities can help to understand the complex behavior of models that incorporate data with varying spatial uncertainties. The findings support the selection of possible calibration parameters and help to anticipate challenges for a transient coupling of the model. </jats:p>
Autoren
  • Robert Reinecke
  • Laura Foglia
  • Steffen Mehl
  • Jonathan D Herman
  • Alexander Wachholz
  • Tim Trautmann
  • Petra Döll
DOI
10.5194/hess-23-4561-2019
eISSN
1607-7938
Ausgabe der Veröffentlichung
11
Zeitschrift
Hydrology and Earth System Sciences
Sprache
en
Online publication date
2019
Paginierung
4561 - 4582
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/hess-23-4561-2019
Datum der Datenerfassung
2020
Titel
Spatially distributed sensitivity of simulated global groundwater heads and flows to hydraulic conductivity, groundwater recharge, and surface water body parameterization
Ausgabe der Zeitschrift
23

Data source: Crossref

Beziehungen:
Property of
Has preprint

Tools