Automatic calibration of groundwater models with bias correction and data filtering: working with drawdown data
Visualitza/Obre
Cita com:
hdl:2117/351918
Tipus de documentArticle
Data publicació2021-03
Condicions d'accésAccés obert
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva
reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets
Abstract
The drawdown response to a hydraulic stress contains crucial information to characterize an aquifer. Modeling drawdowns is far easier than modeling heads because they are subject to homogeneous (zero) internal sink/sources, and boundary and initial conditions. The problem lies on the fact that drawdowns are not measured directly but derived from measurements of head fluctuations. Resulting drawdowns may suffer persistent inaccuracies in complex systems with uncertain long-acting external stresses, so that they are affected not only by errors in head measurements, but also in estimates of the natural head evolution. This hinders the use of drawdowns in groundwater models, and forces modelers to employ absolute heads and soft information. In this context, we present a method to filter systematic errors in drawdown data during the calibration of a groundwater model. To do this, we introduce a bias correction term in a composite inverse problem that combines a natural head model with a drawdown model. Since these two models share the same parameters, a two-stage iterative optimization algorithm is developed to jointly estimate the bias, natural trends, and parameters. The method is illustrated by a synthetic example in a heterogeneous aquifer. The example shows that the method converges to the best conditional estimate even when absolute head data is strongly biased. In the same example, we demonstrate that the use of biased absolute head data in the traditional inverse problem can also provide good fittings but, in this case, the bias leads to an incorrect estimation of the transmissivity field.
CitacióTrabucchi, M.; Fernandez, D.; Carrera, J. Automatic calibration of groundwater models with bias correction and data filtering: working with drawdown data. "Water resources research", Març 2021, vol. 57, núm. 3, p. e2020WR028097:1-e2020WR028097:16.
ISSN0043-1397
Versió de l'editorhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020WR028097
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
31985250.pdf | 1,813Mb | Visualitza/Obre |