Publications des scientifiques de l'IRD

Dages C., Voltz Marc, Bsaibes A., Prévot L., Huttel O., Louchart X., Garnier F., Negro S. (2009). Estimating the role of a ditch network in groundwater recharge in a Mediterranean catchment using a water balance approach. Journal of Hydrology, 375 (3-4), p. 498-512. ISSN 0022-1694.

Titre du document
Estimating the role of a ditch network in groundwater recharge in a Mediterranean catchment using a water balance approach
Année de publication
2009
Type de document
Article référencé dans le Web of Science WOS:000270472100019
Auteurs
Dages C., Voltz Marc, Bsaibes A., Prévot L., Huttel O., Louchart X., Garnier F., Negro S.
Source
Journal of Hydrology, 2009, 375 (3-4), p. 498-512 ISSN 0022-1694
Water balance variables were monitored in a farmed Mediterranean catchment characterized by a dense ditch network to allow for the separate estimation of the diffuse and concentrated recharge terms during flood events. The 27 ha central part of the catchment was equipped with (i) rain gauges, (ii) ditch gauge stations, (iii) piezometers, (iv) neutron probes, and (v) an eddy covariance mast including a 3D sonic anemometer and a fast hygrometer. The water balance was calculated for two autumnal rain and flood events. We also estimated the uncertainty of this approach with Monte Carlo simulations. Results show, that although ditch area represents only 6% of the total study area, concentrated recharge appeared to be the main source of groundwater recharge. Indeed, it was 40-50% of the total groundwater recharge for autumnal events, which are the major annual recharge events. This indicate that both, concentrated and diffuse recharge should be taken into account in any hydrological modeling approach for Mediterranean catchments. This also means that, since they collect overland flow that is often largely contaminated by chemicals, ditches may be a place where groundwater contamination is likely to occur. The uncertainty analysis indicates that recharge estimates based on water balance exhibit large uncertainty ranges. Nevertheless, Monte Carlo simulations showed that concentrated recharge was higher than expected based on their area.
Plan de classement
Hydrologie [062]
Localisation
Fonds IRD [F B010048257]
Identifiant IRD
fdi:010048257
Contact