Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Combining data-based and process-based approaches to minimize the complexity of a reactive sulphate transport model

Title data

Lischeid, Gunnar ; Büttcher, H. ; Hauck, Anette:
Combining data-based and process-based approaches to minimize the complexity of a reactive sulphate transport model.
In: Kovar, Karel (ed.): Calibration and reliability in groundwater modelling : a few steps closer to realtiy ; proceedings of the ModelCARE 2002 Conference held in Prague, Czech Republic, 17 - 20 June 2002. - Wallingford : IAHS Press , 2003 . - pp. 402-408 . - (IAHS Publication ; 277 )
ISBN 1-901502-07-4

Official URL: Volltext

Abstract in another language

Abstract In this study, advanced methods of nonlinear data analysis and mechanistic models are combined to investigate transport and turnover of airborne sulphate in the aquifer of a forested watershed. The objective is to understand why adjacent sites differ substantially with respect to short-term and long-term sulphate concentration time series. First, a groundwater model was parameterized as a basis for a coupled model. A detailed analysis revealed substantial uncertainties with respect to, e.g. residence times and the spatial pattern of groundwater discharge. Second, a time series of sulphate concentration in the catchment runoff was analysed using artificial neural networks. The chemical hydrograph provides spatially integrated information about the groundwater of the watershed. In addition, the pronounced short-term dynamics reflect the varying contribution of shallow and deep groundwater on stream discharge. The neural network revealed a substantial change in these dynamics during the last 14 years. Based on these results, only a few of a variety of candidate processes were selected for a mechanistic model of reactive sulphate transport in the aquifer. Sulphate transport and interaction with the matrix is described as an equilibrium sorption process. A very simplified model is used for water transport. Although none of the parameters was fitted by inverse modelling, the model matched the long-term dynamics of sulphate concentration. In addition, it succeeded in giving the envelope of observed short-term variability of sulphate concentration due to the varying contributions of different flow paths. It is concluded that using different process-based and data-based modelling approaches in an iterative way can considerably help the optimization of hydrologic models with respect to the available data, thus avoiding some of the problems associated with over-parameterized mechanistic models.

Further data

Item Type: Article in a book
Refereed: Yes
Additional notes: BAYCEER42805
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Ecological Modelling
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 30 Sep 2015 05:55
Last Modified: 30 Sep 2015 05:55
URI: https://eref.uni-bayreuth.de/id/eprint/19859