Diffuse and concentrated recharge evaluation using physical and tracer techniques: results from a semiarid carbonate massif aquifer in southeastern Spain |
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| Authors: | Francisco J Alcalá Yolanda Cantón Sergio Contreras Ana Were Penélope Serrano-Ortiz Juan Puigdefábregas Albert Solé-Benet Emilio Custodio Francisco Domingo |
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| Institution: | 1.Geo-Systems Centre/CVRM, Instituto Superior Técnico,Lisbon,Portugal;2.Estación Experimental de Zonas áridas, Consejo Superior de Investigaciones Científicas,Almería,Spain;3.Departamento de Edafología y Química Agrícola,Universidad de Almería,Almería,Spain;4.Bureau of Economic Geology, Jackson School of Geosciences,University of Texas at Austin,Austin,USA;5.Department of Hydrology and Geo-environmental Sciences,Vrije Universiteit Amsterdam,Amsterdam,The Netherlands;6.Centro Andaluz de Medio Ambiente (CEAMA),Granada,Spain;7.Department of Ecology,University of Antwerp,Wilrijk,Belgium;8.Departament d’Enginyería del Terreny, Cartogràfica i Geofísica,Universitat Politècnica de Catalunya (UPC),Barcelona,Spain;9.International Centre for Groundwater Hydrology (FCIHS),Barcelona,Spain;10.Royal Academy of Sciences of Spain (RAC),Madrid,Spain;11.Departamento de Biología Vegetal y Ecología,Universidad de Almería,Almería,Spain |
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| Abstract: | In the high-permeability, semiarid carbonate aquifer in the Sierra de Gádor Mountains (southeastern Spain), some local springs
draining shallow perched aquifers were of assistance in assessing applicability of the atmospheric chloride mass balance (CMB)
for quantifying total yearly recharge (R
T) by rainfall. Two contrasting hydrological years (October through September) were selected to evaluate the influence of climate
on recharge: the average rainfall year 2003–2004, and the unusually dry 2004–2005. Results at small catchment scale were calibrated
with estimated daily stand-scale R
T obtained by means of a soil water balance (SWB) of rainfall, using the actual evapotranspiration measured by the eddy covariance
(EC) technique. R
T ranged from 0.35 to 0.40 of rainfall in the year, with less than a 5% difference between the CMB and SWB methods in 2003–2004.
R
T varied from less than 0.05 of rainfall at mid-elevation to 0.20 at high elevation in 2004–2005, with a similar difference
between the methods. Diffuse recharge (R
D) by rainfall was quantified from daily soil water content field data to split R
T into R
D and the expected concentrated recharge (R
C) at catchment scale in both hydrological years. R
D was 0.16 of rainfall in 2003–2004 and 0.01 in 2004–2005. Under common 1- to 3-day rainfall events, the hydraulic effect of
R
D is delayed from 1 day to 1 week, while R
C is not delayed. This study shows that the CMB method is a suitable tool for yearly values complementing and extending the
more widely used SWB in ungauged mountain carbonate aquifers with negligible runoff. The slight difference between R
T rates at small catchment and stand scales enables results to be validated and provides new estimates to parameterize R
T with rainfall depth after checking the weight of diffuse and concentrated mechanisms on R
T during moderate rainfall periods and episodes of marked climatic aridity. |
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