Institute Hidrologia Of Llanuras Dr Eduardo Usunoff

Azul, Argentina

Institute Hidrologia Of Llanuras Dr Eduardo Usunoff

Azul, Argentina
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Mira Carrion A.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff | Veroslavsky G.,University of the Republic of Uruguay | Vives L.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff | Rodriguez L.,National University of Santa
Revista de la Asociacion Geologica Argentina | Year: 2016

It is known the tectonic influence on the groundwater flow, especially in large aquifers like the Guaraní Aquifer System. In its southern portion, the groundwater flow has a significant uncertainty due to the lack of geological and hydrogeological information. In this paper, a map of lineaments in the Corrientes province (NE Argentina) and its surrounding area is shown. It was constructed from Landsat-ETM satellite images and the SRTM digital elevation model, which allowed us to analyse the tectonic influence in the Guaraní Aquifer System according to the new advances in the knowledge of the deep geological characteristics of the study area. The methodology consisted of multiple tests and measurement reproducibility. Three morpho-structural domains have been identified according to their areal density and lineament orientations. From the hydrogeological point of view, the south-eastern domain is very important because it has the greatest density in NW-SE lineaments, reflecting the higher degree of fracturing. As a result, confining basalts would have a higher equivalent permeability and there would be a higher connectivity between the shallow aquifers and the Guaraní Aquifer System. This may explain, according to the recent hydrochemical studies, the mixing processes between deep and old saline groundwater with precipitation recharge in this area. © 2016, Asociacion Geologica Argentina. All rights reserved.

Zabala M.E.,CONICET | Zabala M.E.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff | Martinez S.E.,Autoridad de Cuenca Matanza Riachuelo ACUMAR | Perevochtchikova M.,Colegio de Mexico | And 2 more authors.
Environmental Earth Sciences | Year: 2017

The aquifer recharge area that supplies water to Mexico City is being protected with the implementation of land use restrictions and with the use of payment schemes for maintaining environmental services (PES). In order to assess the effects of PES in the conservation soil area, the chemical and isotopic compositions of water from springs were characterized and the water baseline chemistry was established to provide a useful standard to monitor the water resources and to support the decision-making under current water management policies. A total of 32 water samples taken in four field surveys, during the dry and rainy season, and background chemical data from different information sources, were studied. The water salinity increases from southwest to northeast towards the urbanized area. The chemical composition of water is due to the occurrence of natural chemical interactions between water and rocks in aquifers and to the presence of effluents generated by human activities. In the forest area, water chemistry has not changed significantly over the past three decades and there are no major discernible trends in the compiled water chemistry data, suggesting that PES has contributed in part to maintain the initial condition in the aquifer recharge area. The natural reference levels proposed have allowed the current chemical conditions in the system to be understood and can be implemented to monitor water resources in the area of conservation soil in the Sierra de Las Cruces with an acceptable degree of reliability. © 2017, Springer-Verlag Berlin Heidelberg.

Alcaraz M.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff | Alcaraz M.,CONICET | Vives L.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff | Vives L.,National University of Central Buenos Aires | And 2 more authors.
Renewable Energy | Year: 2017

The number of shallow geothermal exploitations is growing without a widespread technical framework for this energy resource to be sustainably allocated between users. The thermal impacts that are produced by neighboring exploitations can deplete the resource if they are not properly distributed. Therefore, we present an accessible and simple methodology to define the maximum potential that can be extracted and the position of the exploitations with the objective of limiting the thermal impacts to the available space. The proposed method, named T-I-GER, takes into account the hydraulic and thermal properties of the subsurface as well as the size and orientation of the owner's plot. All this information is integrated in two different graphs: the thermal characteristic curve and the thermal plume graph. Therefore, the installer is able to graphically define the maximum potential and to check that thermal influences are restricted to the plot area. We show with a hypothetical application in Azul city, Argentina, that the maximum extraction potential from similar plots can vary depending on the orientation of the plots with respect to groundwater flow. In the plots where the major dimension is parallel to groundwater flow, the maximum potential can be approximately twice the potential of the perpendicular plots. © 2017 Elsevier Ltd

Holzman M.E.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff | Rivas R.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff | Bayala M.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff
IEEE Geoscience and Remote Sensing Letters | Year: 2014

In this letter, the relationship between temperature vegetation dryness index (TVDI) from the Moderate Resolution Imaging Spectroradiometer and subsurface soil moisture (SM) over crop and native grassland of the Argentine Pampas is analyzed. High correlation (R2 > 0.69) between TVDI and SM measurements was found at different soil depths. In addition, we found that the potential of this index to reflect subsurface soil wetness fluctuations depends on root system depth, root distribution in the soil, and physical soil characteristics. Results indicate that thermal and reflectance data combination could be used to monitor subsurface SM below vegetated areas. © 2014 IEEE.

Mira A.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff | Veroslavsky G.,University of the Republic of Uruguay | Rossello E.,University of Buenos Aires | Vives L.,Institute Hidrologia Of Llanuras Dr Eduardo Usunoff | Rodriguez L.,National University of Santa
Journal of South American Earth Sciences | Year: 2015

From the integration results of geological and geophysical data, a subsurface geological model of the Corrientes province (Argentina) that allows visualizing its deep geological structure and how it affected the Guaraní Aquifer System (GAS) is presented. 44 boreholes, 21 geophysical surveys and 1366 depth data from a Bouguer gravity anomaly model have been used. The model was built from five layers easily distinguishable in the regional subsurface: basement, pre-GAS sediments (Paleozoic), GAS sediments (Triassic-Lower Cretaceous), basalts (Serra Geral Group, Lower Cretaceous) and post basaltic sediments. The resulting geometry shows a basement with a structural high, the Dorsal Asunción-Rio Grande, where the GAS and the basaltic layer are thinner and the Mesozoic sediments rise near the surface. It is an area prone to local recharge and regional discharge of the GAS and it is in line with the latest piezometry and groundwater chemical analysis. Furthermore, two important depocenters have been identified, Corrientes and Curuzú structural high blocks, with at least 3500m of sedimentary and volcano-sedimentary deposits that suggest the existence of significant pre-carboniferous sediment units associated to ancient extensional structures of the early Paleozoic. The proposed model allows defining a lithostratigraphic column of Corrientes and gives new criteria to redraw the southwest limit of the GAS. © 2015 Elsevier Ltd.

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