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| HAL : hal-00461983, version 1 |
| DOI : 10.1016/j.jhydrol.2008.11.006 |
| Code IRD Horizon : fdi:010045382 |
| Fiche détaillée |  Récupérer au format |
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| Journal of Hydrology 364 (2009) 272-284 |
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| Indirect and direct recharges in a tropical forested watershed: Mule Hole, India |
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| Jean-Christophe Maréchal 1, 2Rrv Murari 1, 3 |
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| (30/01/2009) |
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| It is commonly accepted that forest plays role to modify the water cycle at the watershed scale. However, the impact of forest on aquifer recharge is still discussed: some studies indicate that infiltration is facilitated under forest while other studies suggest a decrease of recharge. This paper presents an estimate of recharge rates to groundwater in a humid forested watershed of India. Recharge estimates are based on the joint use of several methods: chloride mass balance, water table fluctuation, geophysics, groundwater chemistry and flow analysis. Two components of the recharge (direct and indirect) are estimated over 3 years of monitoring (2003-2006). The direct and localized recharges resulting from rainfall over the entire watershed surface area is estimated to 45 mm/yr while the indirect recharge occurring from the stream during flood events is estimated to 30 mm/yr for a two km-long stream. Calculated recharge rates, rainfall and runoff measurements are then combined in a water budget to estimate yearly evapotranspiration which ranges from 80 to 90% of the rainfall, i.e. 1050 mm/y as an average. This unexpected high value for a deciduous forest is nevertheless in agreement with the forest worldwide relationship between rainfall and evapotranspiration. The large evapotranspiration form the forest cover contributes to decrease the recharge rate which leads to a lowering of the water table. This is the reason why the stream is highly ephemeral. |
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| 1 : | Indo-French Cell for Water Sciences |
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Indian Institute of Science |
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| 2 : | Laboratoire des Mécanismes et Transfert en Géologie (LMTG) |
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CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154 |
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| 3 : | Department of Civil Engineering |
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Indian Institute of Science |
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| 4 : | Indo-French Cell for Water Science |
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Indian Institute of Science |
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| 5 : | Laboratoire d'étude des transferts en hydrologie et environnement (LTHE) |
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CNRS : UMR5564 – OSUG – INSU – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG) – Institut de recherche pour le développement [IRD] : UR012 |
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| 6 : | Sol Agro et hydrosystème Spatialisation (SAS) |
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Institut national de la recherche agronomique (INRA) : UR1069 – Ecole Nationale Supérieure Agronomique de Rennes |
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| Domaine | : | Planète et Univers/Sciences de la Terre/Hydrologie Sciences de l'environnement/Milieux et Changements globaux |
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| Natural recharge – Chloride mass balance – Forest – Water table fluctuation – Analytical solution – Evapotranspiration |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00461983, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00461983 | |
| oai:hal.archives-ouvertes.fr:hal-00461983 | |
| Contributeur : Jean-Christophe Maréchal | |
| Soumis le : Lundi 8 Mars 2010, 10:03:21 | |
| Dernière modification le : Lundi 8 Mars 2010, 10:34:03 | |
