Abstract
The Tarn-et-Garonne department is crossed by three main rivers (Garonne, Tarn and Aveyron) whose alluvial plain covers an area of almost 1000 km2. Since 1996, the “Direction Départementale des Territoires” (Gov. Administration at county level), with the technical help of the French geological survey (BRGM), initiated the development of a groundwater model and a decision support tool to define annual groundwater abstraction allocations. As the field data and the computing capacities increased and the law evolved, three versions of the groundwater model were successively developed to better assess the Maximum Permissible Volumes (MPV) of groundwater abstraction on a yearly basis. The last transient state version takes into account the annual fluctuations in groundwater recharge and the water exchanges between the aquifer and the rivers. The MPVs are calculated each year in 21 management zones outside of the previously defined riverside aquifer. These zones are now managed by five agricultural users’ associations, known as collective management agencies (or OUGCs). Further improvement should lead to the decision support tool being available online, to encourage OUGCs and farmers to be more proactive in managing the groundwater resource.
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Notes
- 1.
The model was calibrated based on the piezometric history for the period 1996–2005, with a bimonthly interval, i.e. the groundwater level was simulated every 2 months and abstraction for irrigation was allocated to June–July and August–September.
- 2.
The improvements include: the aquifer geometry, calculation of recharge, accounting for the fluctuations in the water levels in the rivers and reducing the modelling timestep from 2 months to 10 days (Bardeau & Le Cointe, 2016; Thiéry, 2010a, 2014). The model was recalibrated, using data from groundwater monitoring for the period 2005–2015 and validated for the period 1995–2015.
References
Bardeau, M., & Le Cointe, P. (2016). Gestion des systèmes aquifères alluviaux dans le bassin Adour-Garonne – Résultats de la modélisation et outil de gestion des prélèvements dans le Tarn-et-Garonne. BRGM report/RP-65583-FR, BRGM, Ramonville-Saint-Agne, France.
Bouroullec, I. (2013). Carte géologique harmonisée du département du Tarn-et-Garonne. BRGM report/RP-61974-FR, BRGM, Ramonville-Saint-Agne, France.
Collin, J. J., & Daum, J. R. (1995). Méthodes d’évaluation de l’impact des prélèvements réalisés dans les nappes d’accompagnement sur les eaux superficielles associées. BRGM report/R-38586, BRGM, Orléans, France.
Gandolfi, J. M., Danneville, L., Petit, V., & Tilloloy, F. (1997). Connaissance, évaluation et protection des aquifères alluviaux de Tarn-et-Garonne (82). BRGM Report/R-39543, BRGM, Toulouse, France.
Ghyselinck-Bardeau, M. (2004a). Etude des aquifères alluviaux du Tarn-et-Garonne – Modélisation nappe-rivière en régime transitoire (Garonne, Tarn et Aveyron) – Intermediary report– Year 2. BRGM report/RP-53207-FR, BRGM, Ramonville-Saint-Agne, France.
Ghyselinck-Bardeau, M. (2004b). Etude des aquifères alluviaux du Tarn-et-Garonne – Modélisation nappe-rivière en régime transitoire (Garonne, Tarn et Aveyron) – Final report – Year 2. BRGM report/RP-53406-FR, BRGM, Ramonville-Saint-Agne, France.
Ghyselinck-Bardeau, M. (2007). Gestion des systèmes alluviaux dans le bassin Adour-Garonne – Modélisation de la nappe alluviale de la Garonne, du Tarn et de l’Aveyron dans le département de Tarn-et-Garonne – Final report. BRGM report/RP-55315-FR, BRGM, Ramonville-Saint-Agne, France.
Ricard, J. (1998). Gestion des systèmes alluviaux dans le bassin Adour-Garonne – Appui à la Police de l’Eau en Midi-Pyrénées – Mise en place des réseaux d’acquisition de données sur les aquifères alluviaux du Tarn-et-Garonne en vue de la réalisation d’un modèle en régime transitoire (phase 2 – tranche 1). BRGM report/R-40364, BRGM, Toulouse, France.
Ricard, J., & Tilloloy, F. (1999). Gestion des systèmes alluviaux dans le bassin Adour-Garonne – Appui à la Police de l’Eau en Midi-Pyrénées – Réseaux d’acquisition des données sur les aquifères alluviaux du Tarn-et-Garonne (phase 2 – tranche 2). BRGM report/R-40731, BRGM, Toulouse, France.
Saplairoles, M. (2005). Etude des aquifères alluviaux du Tarn-et-Garonne – Présentation de l’outil de gestion issu de la modélisation en régime transitoire. BRGM report/RP-54309-FR, BRGM, Ramonville-Saint-Agne, France.
Soulé, J. C. (1978). Evaluation des Ressources Hydrauliques de la France. Etat des connaissances et synthèse hydrogéologique du département de Tarn-et-Garonne. BRGM report/78-SGN-070-MPY, BRGM, Toulouse, France.
Thiéry, D. (1990). Logiciel MARTHE – Modélisation d’Aquifère par un maillage Rectangulaire en régime Transitoire pour le calcul Hydrodynamique des Ecoulements. BRGM report/R-32210, BRGM, Orléans, France.
Thiéry, D. (2010a). Reservoir Models in Hydrogeology in Mathematical Models Volume 2, chapter 13, pp. 409–418. Environmental Hydraulics Series, Tanguy J.M. (Ed.), Wiley/ISTE Editions, London, United Kingdom.
Thiéry, D. (2010b). Groundwater Flow Modeling in Porous Media Using MARTHE in Modeling Software Volume 5, chapter 4, pp. 45–60. Environmental Hydraulics Series, Tanguy J.M. (Ed.), Wiley/ISTE Editions, London, United Kingdom.
Thiéry, D. (2014). Logiciel GARDÉNIA, version v8.2. Mise à jour version v8.7. Guide d’utilisation. BRGM reoprt/RP-62797-FR, update: February 2019, BRGM, Orléans, France.
Thiéry, D. (2015). Code de calcul MARTHE – Modélisation 3D des écoulements dans les hydrosystèmes – Notice d’utilisation de la version 7.5. BRGM report/RP-64554-FR, BRGM, Orléans, France.
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Le Cointe, P., Nuttinck, V., Rinaudo, JD. (2020). A Tool to Determine Annual Ground-Water Allocations in the Tarn-et-Garonne Alluvial Aquifer (France). In: Rinaudo, JD., Holley, C., Barnett, S., Montginoul, M. (eds) Sustainable Groundwater Management. Global Issues in Water Policy, vol 24. Springer, Cham. https://doi.org/10.1007/978-3-030-32766-8_13
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