On the inclusion of ground-based gravity measurements to the calibration process of a global rainfall-discharge reservoir model: case of the Durzon karst system (Larzac, southern France)

Naomi Mazzilli (1) , Hervé Jourde (1) , Thomas Jacob (2) , Vincent Guinot (1) , Nicolas Le Moigne (3) , Marie Boucher (4) , Konstantinos Chalikakis (5) , Hélène Guyard (4) , Anatoly Legtchenko (4)

1 HSM - Hydrosciences Montpellier
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
3 Géosciences Montpellier
4 LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
5 Laboratoire d'Hydrogéologie d'Avignon

Thiswork examines the relevance of the inclusion of ground-based gravity data in the calibration process of a global rainfall-discharge reservoir model. The analysis is performed for the Durzon karst system (Larzac, France). The first part of the study focuses on the hydrological interpretation of the ground-based gravity measurements. The second part of the study investigates further the information content of the gravity data with respect to water storage dynamics modelling.The gravity-derived information is found unable to either reduce equifinality of the single-objective, dischargebased model calibration process or enhance model performance through assimilation.

Mots clés: Karst aquifer; Conceptual reservoir model; Model; calibration; Soft data; Ground-based gravity monitoring; epikarst

Domaines: Planète et Univers [physics]; Sciences de la Terre; Géophysique [physics.geo-ph]; Physique [physics]; Physique [physics]; Géophysique [physics.geo-ph]; Sciences de l'environnement; Milieux et Changements globaux

Naomi Mazzilli, Hervé Jourde, Thomas Jacob, Vincent Guinot, Nicolas Le Moigne, et al.. On the inclusion of ground-based gravity measurements to the calibration process of a global rainfall-discharge reservoir model: case of the Durzon karst system (Larzac, southern France). Environmental Earth Sciences, 2013, 68 (6), pp.1631-1646. ⟨10.1007/s12665-012-1856-z⟩. ⟨hal-00812624⟩