RT Journal Article
T1 Parameterization and quantification of recharge in crystalline fractured bedrocks in Galicia-Costa (NW Spain)
A1 Raposo González, Juan Ramón
A1 Molinero, J.
A1 Dafonte Dafonte, Jorge
K1 Parameterization
K1 Quantification
K1 Crystalline
K1 Galicia-Costa
K1 Underground medium
K1 Chloride mass balance (CMB)
AB Quantifying groundwater recharge in crystalline rocks presents great difficulties due to the high heterogeneity of the underground medium (mainly, due to heterogeneity in fracture network, which determines hydraulic parameters of the bedrock like hydraulic conductivity or effective porosity). Traditionally these rocks have been considered to have very low permeability, and their groundwater resources have usually been neglected; however, they can be of local importance when the bedrock presents a net of well-developed fractures. The current European Water Framework Directive requires an efficient management of all groundwater resources; this begins with a proper knowledge of the aquifer and accurate recharge estimation. In this study, an assessment of groundwater resources in the Spanish hydrologic district of Galicia-Costa, dominated by granitic and metasedimentary rocks, was carried out. A water-balance modeling approach was used for estimating recharge rates in nine pilot catchments representatives of both geologic materials. These results were cross-validated with an independent technique, i.e. the chloride mass balance (CMB). A relation among groundwater recharge and annual precipitation according to two different logistic curves was found for both granites and metasedimentary rocks, thus allowing the parameterization of recharge by means of only a few hydrogeological parameters. Total groundwater resources in Galicia-Costa were estimated to be 4427 hm3 yr−1. An analysis of spatial and temporal variability of recharge was also carried out.
PB Copernicus Publications
SN 1027-5606
YR 2012
FD 2012
LK http://hdl.handle.net/10347/21826
UL http://hdl.handle.net/10347/21826
LA eng
NO Raposo, J. R., Molinero, J., and Dafonte, J.: Parameterization and quantification of recharge in crystalline fractured bedrocks in Galicia-Costa (NW Spain), Hydrol. Earth Syst. Sci., 16, 1667–1683, https://doi.org/10.5194/hess-16-1667-2012, 2012.
NO This work has been co-funded by Augas de Galicia and the Galician government Xunta de Galicia, within the framework of research project INCITE09 203 072 PR and by the European Regional Development Fund (ERDF). The first author has been granted a F.P.U. fellowship by the Spanish Ministry of Education
DS Minerva
RD 27 abr 2026