ORBi: Beaujean Jean - Joint and sequential inversion of geophysical and hydrogeological data to characterize seawater intrusion models

Reference : Joint and sequential inversion of geophysical and hydrogeological data to characterize s...


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Geological, petroleum & mining engineering
	To cite this reference:	http://hdl.handle.net/2268/77242

Title :	Joint and sequential inversion of geophysical and hydrogeological data to characterize seawater intrusion models
Language :	English
Alternative title :	[fr] Inversion jointe et séquentielle de données hydrogéophysiques pour la caractérisation de modèles hydrogéologiques d'intrusion d'eau salée
Author, co-author :	Beaujean, Jean [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
	Nguyen, Frédéric [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
	Kemna, Andreas [University of Bonn > Department of Geodynamics and Geophysics > Applied Geophysics > >]
Publication date :	Jun-2010
Edition :	1st Edition
Main document title :	Proceedings SWIM21, 21st Salt Water Intrusion Meeting
Alternative title :	[fr] Conférence internationale SWIM21, Salt Water Intrusion Meeting
Editor :	Teresa Condesso de Melo, Maria
	Lebbe, Luc
	Virgílio Cruz, José
	Coutinho, Rui
	Langevin, Christian
Publisher :	Nova Gráfica - Artes Gráfica
Collection and collection volume :	312640/10
Pages :	57-60
On invitation :	No
Audience :	International
ISBN :	978-972-97711-4-9
City :	Ponta Delgada
Country :	São Miguel, Açores, Portugal
Event name :	21st Salt Water Intrusion Meeting SWIM21
Event date :	du 21 Juin 2010 au 26 Juin 2010
Event organizer :	Maria Teresa Condesso de Melo
	Rui Coutinho
	José Virgílio Cruz
	Christian Langevin
	Luc Lebbe
Event place (city) :	Ponta Delgada
Event country :	Portugal
	Azores
Keywords :	[en] Seawater intrusion ; Sequential inversion ; Hydrogeophysics
	[fr] Intrusion d'eau salée ; Inversion séquentielle ; Hydrogéophysique
Abstract :	[en] The integrated water resource management problems require studying efficiently seawater intrusion at local and regional scale and identifying in real time the seawater/freshwater interface dynamic. Hydrogeological modeling is widely used to predict seawater intrusion if additional natural or man‐made factors are modified. These models are currently calibrated using measured heads and salt mass fractions in boreholes, which generally result in sparse data coverage. Within this scope, non to minimally invasive geophysical techniques like electrical resistivity tomography (ERT) or time‐domain electromagnetic method are becoming increasingly popular, given their relatively greater spatial horizontal resolution compared to borehole observations. We present a comparison between both a sequential and joint approach to calibrate seawater intrusion models using ERT. The former consists of constraining hydrogeological parameters using ERT derived parameters and relies on sequential inversions of the geophysical and hydrogeological data using a given petrophysical relationship. The second approach in based on simultaneous inversion of petrophysical and hydrogeological data using electrical resistance data as data. It is performed by coupling an inversion code with two hydrogeological and geophysical modeling codes through a petrophysical conversion. This investigation was performed on a densitydependent flow and transport numerical (three/two‐dimensional) simulation study from complex and realistic heterogeneous models. In the sequential approach, the simulations showed that only the shallow salt concentration of the seawater/freshwater transition zone could be recovered for different time‐lapse, due to poorly resolved regions in depth. The capability of image appraisal indicators (cumulative sensitivity and resolution) has been analyzed to emphasize the discrepancy between the targeted and imaged parameter values. On the other hand, the preliminary coupled inversion avoids the regularization bias introduced by ERT and addresses the non‐stationarity of the petrophysical relationship.
Research units :	Université de Liège - Département ArGEnCo - GEO³ - Geophysique Appliquée
Funders :	Patrimoine de l'Université de Liège
Name of the research project :	Développement de méthodes d'intégration de données géophysiques et hydrogéologiques afin de caractériser les intrusions d'eau salée en région côtière et de les modéliser.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/77242
Other URL :	http://www.swim21-azores2010.com/e-bookfiles/SWIM21_eBook.pdf

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