Title
Deterministic and stochastic modelling for protection zone delineation Deterministic and stochastic modelling for protection zone delineation
Author
Publication type
conferenceObject
Publication
Wallingford ,
Subject
Biology
Source (journal)
To reality
IAHS publications / International Association of Hydrological Sciences. - Wallingford
Source (book)
Conference on Calibration and Reliability in Groundwater Modelling, (ModelCARE 2002), JUN 17-20, 2002, PRAGUE, CZECH REPUBLIC
Volume/pages
(2003) :277 , p. 489-497
ISSN
0144-7815
ISBN
1-901502-07-4
ISI
000189478600065
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
Protection zones delimited by isochrones are often computed using calibrated groundwater flow and transport models. In heterogeneous formations, all direct (hard) and indirect (soft) data must be used optimally. Approaches involving in situ pumping and tracer tests, combined with geophysical and/or other geological observations, should be developed. In a deterministic framework, the calibrated model is considered to be the best representation of reality at the Current stage of investigation, but uncertainty of the results is not quantified. Using stochastic methods, a range of equally likely isochrones can be produced, allowing us to quantity the influence of our knowledge of the aquifer parameters on protection-zone uncertainty. Furthermore, integration of soft data in a conditioned stochastic generation process, possibly associated with an inverse modelling procedure, can reduce the resulting uncertainty. A stochastic methodology for protection-zone delineation, integrating hydraulic conductivity measurements (hard data), head observations and electrical resistivity data (soft data) is proposed.
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