Antonio González-Ramón
Instituto Geológico y Minero de España
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Publication
Featured researches published by Antonio González-Ramón.
Science of The Total Environment | 2018
J. A. Barberá; Jorge Jódar; Emilio Custodio; Antonio González-Ramón; Pablo Jiménez-Gavilán; Iñaki Vadillo; A. Pedrera; Sergio Martos-Rosillo
In many of the alpine watersheds of Sierra Nevada (Southern Spain) exists an ancient network of dug canals that collect, transport and facilitate the recharge the snowmelt in the underlying aquifer during the spring season. This practice, known as careos, in the lower part of the watersheds supply drinking water as spring discharge during the dry season. To study how this managed recharge technique modifies the natural response of these basins this work focuses on characterizing the hydrological behavior of one of the sites, the Berchules watershed. The mechanisms for mineralization of groundwater are based on geochemical processes such as evapo-concentration in the soil layer and silicate mineral weathering due to dissolved CO2 originated from both soil biogenic processes and the atmosphere. Groundwater presents a main hydrogeochemical calcium‑magnesium-bicarbonate type facies, which is associated to groundwater flowing through the upper weathered silicates and quickly drained through springs located in the uplands and in the intermediate altitude catchment zone. Additionally, in the lower part of the basin some springs discharge mineralized groundwater with a sodium-calcium-bicarbonate composition associated to regional groundwater flow. In natural conditions, this hydrogeological system behaves as a sloping aquifer, occurring recharge between 1400 and 2500 m a.s.l. The springs discharge groundwater with an isotopic content and temperature in coherence with the local rainfall isotopic and thermal atmospheric altitudinal lines. Nevertheless, once the careo recharge begins the affected springs reveal the fingerprint of the concentrated recharge system by blurring the fingerprint of both the isotopic and thermal altitudinal dependence in the springs discharge. This validates the previous conceptual model and supports average recharge values of 141 ± 140 mm/yr and total average water resources of 181 ± 111 mm/yr which include a 40% increase in the study period due to the effect of the acequias de careo.
Archive | 2017
Antonio González-Ramón; Sergio Martos-Rosillo; Ana Ruiz-Constán; Antonio Pedrera; Jesús Galindo-Zaldívar; Manuel Martínez-Martos
The adequate management of small aquifers located in structurally complex areas requires detailed geological and hydrogeological knowledge of the system. The analysis may include features related to the aquifers´ 3D geometry, their lateral connection with other aquifers, their hydraulic parameters, and their storage and recovery capacities during dry periods. To accomplish such a study is complex, and it involves even more uncertainties in the case of karst aquifers due to their special features. In this paper we present a multidisciplinary hydrogeological approach to explore a carbonate aquifer of southern Spain subjected to intensive exploitation. The study allowed us to redefine its geometry and its limits through the acquisition of geological and geophysical (gravity) data. New hydrodynamic, hydrogeochemical and isotopic information led to a new conceptual model and the definition of guidelines for a more efficient management.
Archive | 2017
Juan Antonio Luque-Espinar; Eulogio Pardo-Igúzquiza; Antonio González-Ramón; M. López-Chicano; Juan José Durán-Valsero; David Pulido-Velazquez
Both Moon and Sun induce Earth tides. Signatures of the Earth’s crustal tides could be recorded in the groundwater in the form of rise and fall of its piezometric surface. In relationship with this phenomenon, there is a scarcity of these kinds of studies in carbonate aquifers. Spectral analysis has been applied in Sierra Gorda aquifer located in the southern of Spain in order to determine the presence and statistical significance of cycles from different time data series like air temperature, barometric pressure, electrical conductivity, pH and piezometric level located in the north border of the aquifer. Diver and Hidrolab sensors to collect data every 1 and 6 h were installed in some of these springs and piezometric borehole. The piezometric data series have more than 25,000 hourly data. The period studied start in November 2010 and end in September 2013. In this site, it has been observed some spectral peaks that could be linked with crustal tides related to cyclic movement of Moon and Sun around Earth. The most significant peaks in piezometric levels that could be related to Moon and Sun show values of 12 h, 1 day, 14 days and 28 days. On the other hand, similar signal is recorded by pH and conductivity temporal data. The influence of Earth tides on pH and conductivity is less studied and would be necessary new investigations on this aquifer to confirm this possibility. The spectral signature of temperature and barometric data is quite different to others variables studied.
Hydrological Processes | 2017
Antonio González-Ramón; M. López-Chicano; Fernando Gázquez; Juan José Durán-Valsero; Antonio Pedrera; Ana Ruiz-Constán; Elena González-Egea
The Sierra Gorda aquifer is one of the most extensive of southern Spain. The main groundwater discharge is produced at its northern boundary through several high-flow springs. In this study, stable isotopes of dissolved sulfate (δ34S and δ18O) and groundwater chemistry were used to determine the origin of the sulfate and to characterize the groundwater flow. We sampled the main springs, as well as other minor outlets related to perched water tables, in order to determine the different sources of SO42- (e.g. dissolution of evaporites, atmospheric deposition, etc.). The substantial difference in the amount of dissolved SO42- between the springs located in its northwestern part (≈25 mg/l) and those elsewhere in the northern part (≈60 mg/l) suggests zones with separate groundwater flow systems. A third group of springs, far from the northeastern boundary of the permeable outcrops, shows higher SO42- content than the rest (≈125 mg/l). The isotopic range of sulfate (-0.3 to 14.82‰ V-CTD) points to several sources, including dissolution of Triassic or Miocene evaporites, atmospheric deposition, and decomposition of organic material in the soil. Among these, the dissolution of Triassic gypsum —which overlies the saturated zone as a consequence of the folds and faults that deform the aquifer— is the main source of SO42- (range from 12.79 to 14.82‰ V-CTD). This range is typical for Triassic gypsum. The higher karstification in the western sector, together with important differences in the saturated thickness between the western and eastern sectors, would also be due to the tectonic structure and could explain the difference in SO42- contents in the water. This singular arrangement may cause a higher residence time of groundwater in the eastern sector; thus, a higher contact time with Triassic evaporitic rocks is inferred. Accordingly, the stable isotopes of SO42- are found to be a valuable tool for identifying areas with different flow systems in the saturated zone of karstic aquifers, as well as for evaluating aspects such as the degree of karstification.
Archive | 2014
Javier Heredia; Eulogio Pardo-Igúzquiza; Antonio González-Ramón
The Loma de Ubeda cabonate aquifer (Spain) has a great complexity due to tectonic features that compartmentalize and connect it with adjacent formations. This aquifer is the main element of a multilayer system and 40 % of which is between 400 and 800 m of depth. The aquifer has been overexploited. Flow models were used for management the water resources and a 3D geometrical model was a basic component. The stochastic modeling of a 3D geometrical model mimics the geologic evolution: (a) folded deposit model without faults, (b) occurrence of discontinuities due to faulting and (c) occurrence of an erosive process. The input data were 143 boreholes and the geological contacts between different stratigraphic units observed in the outcrops. As a first step the top and bottom boundaries of the studied formation were obtained using the kriging interpolation algorithm assuming that there were no faults. This 3D model together with information on the main tectonic features was used in a second step to generate by kriging a new geometrical model including faults. Finally, the digital elevation model was superimposed to the carbonate.
Quaternary Research | 2008
Edward J. Hodge; David A. Richards; Peter L. Smart; Bartolomé Andreo; Dirk L. Hoffmann; Dave Mattey; Antonio González-Ramón
Science of The Total Environment | 2017
Jorge Jódar; José Antonio Cabrera; Sergio Martos-Rosillo; Ana Ruiz-Constán; Antonio González-Ramón; Luis Javier Lambán; Christian Herrera; Emilio Custodio
Environmental Earth Sciences | 2012
Antonio González-Ramón; M. López-Chicano; Juan Carlos Rubio-Campos
Science of The Total Environment | 2018
Jorge Jódar; E. Carpintero; Sergio Martos-Rosillo; Ana Ruiz-Constán; C. Marín-Lechado; J.A. Cabrera-Arrabal; E. Navarrete-Mazariegos; Antonio González-Ramón; Luis Javier Lambán; Christian Herrera; M.P. González-Dugo
Quaternary Research | 2012
Antonio González-Ramón; Bartolomé Andreo; Antonio Ruiz-Bustos; David A. Richards; José Antonio López-Sáez; Francisca Alba-Sánchez