RT Journal Article
T1 Hydrogeology and groundwater management in a coastal granitic area with steep slopes in Galicia (Spain)
T2 Hydrogéologie et gestion des eaux souterraines dans une zone granitique côtière avec des pentes fortes en Galice (Espagne)
T2 Hidrogeología y gestión del agua subterránea en una zona granítica costera de Galicia (España) con pendientes pronunciadas
A1 Naves, Acacia
A1 Samper, Javier
A1 Pisani, Bruno
A1 Mon, Alba
A1 Dafonte Dafonte, Jorge
A1 Montenegro, Luis
A1 García-Tomillo, Aitor
K1 Igneous rocks
K1 Numerical modelling
K1 Groundwater recharge/water budget
K1 Spain
K1 Water supply
AB Groundwater availability, management and protection are great challenges for the sustainability of groundwater resources in the scattered rural areas of the Atlantic regions of Europe where groundwater is the only option for water supply. This report presents a hydrogeological study of the coastal granitic area of Oia in northwestern Spain, which has unique geomorphological and hydrogeological features with steep slopes favoring the erosion of the weathered granite. The hydrogeological conceptual model of the study area includes: (1) the regolith layer, which is present only in the flat summit of the mountains; (2) the slope debris and the colluvial deposits, which are present in the intermediate and lowest parts of the hillside; (3) the marine terrace; and (4) the underlying fractured granite. Groundwater recharge from rainfall infiltration varies spatially due to variations in terrain slope, geology and land use. The mean annual recharge estimated with a hydrological water balance model ranges from 75 mm in the steepest zone to 135 mm in the lowest flat areas. Groundwater flows mostly through the regolith and the detrital formations, which have the largest hydraulic conductivities. Groundwater discharges in seepage areas, springs, along the main creeks and into the sea. The conceptual hydrogeological model has been implemented in a groundwater flow model, which later has been used to select the best pumping scenario. Model results show that the future water needs for domestic and tourist water supply can be safely provided with eight pumping wells with a maximum pumping rate of 700 m3/day.
PB Springer Nature
YR 2021
FD 2021-05-21
LK https://hdl.handle.net/10347/38284
UL https://hdl.handle.net/10347/38284
LA eng
NO Naves, A., Samper, J., Pisani, B., Mon, A., Dafonte, J., Montenegro, L., & García-Tomillo, A. (2021). Hydrogeology and groundwater management in a coastal granitic area with steep slopes in Galicia (Spain). Hydrogeology Journal, 29(8), 2655-2669. https://doi.org/10.1007/S10040-021-02349-5
NO This work has been funded by the Water Authority of the Galician Regional Government (Xunta de Galicia), the Spanish Ministry of Economy and Competitiveness (Project PID2019-109544RB-I00), FEDER funds and the Galician Regional Government, Xunta de Galicia (Grant number ED431C 2017/57) from “Consolidación e estruturación de unidades de investigación competitivas”, Grupos de referencia competitiva.
DS Minerva
RD 28 abr 2026