Integration of GIS, Electromagnetic and Electrical Methods in the Delimitation of Groundwater Polluted by Effluent Discharge (Salamanca, Spain): A Case Study

Vidal, Rubén; Martínez-Graña, Antonio Miguel; Catalán, José R. Martı́nez; Ayarza, P.; Román, F. Javier Sánchez San; Zazo, Caridad

doi:10.3390/ijerph14111369

Cited by 9 publications

(3 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To estimate the optimum location to drill groundwater boreholes, we would combine all the hydro-geoelectrical parameter reclassified datasets. The suitability analysis was established using GIS methods dependent on a number of thematic layers [35]. The Fuzzy overlay instrument permits the inquiry of the option of a phenomenon fitting to numerous sets in multi-criteria overlay analysis.…”

Section: Suitability Modelmentioning

confidence: 99%

Integrated Geophysical Data and GIS Technique to Forecast the Potential Groundwater Locations in Part of South Eastern Nigeria

Agbasi

Aziz²,

Abdulrazzaq³

et al. 2019

eijs

View full text Add to dashboard Cite

The objective of this research is to select the most suitable drilling location of new groundwater exploration wells, with a decision-making tool from Geographic Information System (GIS). The optimum location will be evaluated base on the hydro-geoelectrical parameter derived from Vertical Electrical Sound (VES) including Longitudinal Conductance, the thickness of the aquifer, the apparent resistivity and Transmissivity. From the Geo-electrical method (VES) the finds shows that the aquifers in the study area have Apparent Resistivity ranging from 0.32 to 40.24 Î©m, Thickness between 0.21 m to 15.06 m, Longitudinal Conductance ranging from 0.006 to 10.246Î©-1 and Transmissivity ranging from 0.14 to 10.38m2/day. Hydro-geoelectrical data were integrated into GIS to precisely determine the best location for groundwater borehole. Finally, the study location was classified into three classes; not suitable, moderately suitable and highly suitability with respect to the input factors using the Fuzzy overly combing method. Itâ€™s evident that the middle part of the area in study represents the optimum location for the drilling of groundwater boreholes.

show abstract

Section: Suitability Modelmentioning

confidence: 99%

Integrated Geophysical Data and GIS Technique to Forecast the Potential Groundwater Locations in Part of South Eastern Nigeria

Agbasi

Aziz²,

Abdulrazzaq³

et al. 2019

eijs

View full text Add to dashboard Cite

show abstract

“…The non-uniqueness of microgravity interpretations is often assisted by the use of other high-resolution techniques. Among those, electric resistivity tomography (ERT) has the potential of constraining the existence of empty resistive cavities (Orfanos & Apostolopoulos, 2011) or conductive saturated areas (Nyquist et al, 2008;Taniguchi et al, 2007;Vidal Montes et al, 2016, 2017, resulting in useful applications to estimate the effect of water in the settlement and foundation of civil constructions.…”

Section: Introductionmentioning

confidence: 99%

Assessing the dam's stability of the pond at the ‘El Bosque’ renaissance garden (Béjar, Spain)

Ayarza,

Yenes,

Sánchez‐Sánchez

et al. 2023

Near Surface Geophysics

View full text Add to dashboard Cite

The renaissance botanical garden of ‘El Bosque’ in Béjar (Salamanca, Spain) presents a pond bounded by a dam in its western part. The latter is formed by two masonry walls interconnected by buttresses. Cubic spaces in between are filled with a variable grain‐size material (silty sand) that allows limited water flow. In recent years the southern part of the dam has experienced localized and random subsidence that jeopardizes the entrance to part of the garden. To regain access, a proper and reliable diagnosis of the origin, magnitude and relevance of the subsidence must be made. In this regard, we have undertaken a microgravity survey in the dam area to identify places with an anomalous distribution of the filling material in order to foresee further sinking or potential collapsing areas. The precise positioning (2 mm resolution) and accurate terrain correction needed in this kind of high‐resolution gravity surveys (points every 1.5 m) was achieved by creating a detailed Digital Terrain Model (cm resolution) with a remotely piloted aircraft. In addition, we performed three electric resistivity tomography (ERT) profiles at different levels of the garden: i) on the dam itself, ii) right on the foot of the dam and parallel to it (5 m below and ∼17m to the W), and iii) a bit farther, but also parallel to the dam (8 m below and ∼27m to the W). The ERT profiles identified high conductivity in water‐saturated areas and determined the paths that rainfall and pond's seepage water follow in the dam and its underground, formed by granites. The geophysical studies were paired with geotechnical analyses of the sunk materials. The study concluded that the thinnest fraction of the dam's filling material (i.e., silts) is being washed away, leaving behind sand with less density and stability, susceptible to collapse. Thus, the observed sinking is related to soil piping, i.e. to soil internal erosion and compaction issues that force the soil material to re‐adjust geometrically and volumetrically.This article is protected by copyright. All rights reserved

show abstract

“…Actually, they can also be used to perform sounding surveys to get quantitative estimates of depth variations in true electrical conductivity [19,20], but with a time-consuming, and thus unfeasible, procedure. Several case studies have tested the capability of EMI for landfill characterisation by mapping [21][22][23], often in combination with other geophysical techniques [22][23][24][25][26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Frequency-Domain Electromagnetic Mapping of an Abandoned Waste Disposal Site: A Case in Sardinia (Italy)

et al. 2022

View full text Add to dashboard Cite

For decades, bad practices in municipal and industrial waste management have had negative environmental impacts, generating high health risks for people and the environment. The use of badly designed, not engineered, and not well-operated landfills has, around the world, produced a large number of potentially contaminated sites, for which there are urgent needs to assess the actual risk and to proceed, in case, with reclamation activities. One of these sites, an abandoned waste disposal site located near a Site of Community Importance on the central-eastern coast of Sardinia (Italy), is the subject of the case history described in this work. As a part of a multi-method geophysical characterisation, a frequency-domain electromagnetic (FDEM) mapping survey was carried out with the specific aim of detecting the presence of buried materials (waste) and of delineating the lateral extent of the landfill by identifying the electrical conductivity anomalies produced, for the most part, by the conductive waste fill. Using an EM31 device in the vertical-dipole configuration, at a height of 0.9 m above the ground, both quadrature and in-phase electromagnetic responses were collected over a 7-hectare area with elevation varying between 6 m and 2.8 m above sea level. After removing the measurements identified as data coming from any recognisable surface man-made features within the survey area or near its perimeter, the filtered quadrature response (expressed as apparent conductivity) ranged from 5.5 mS/m to about 188.6 mS/m. All values are beyond the low induction number (LIN) condition and valid for the classical EM31 mapping, thus requiring advanced data processing. To obtain undistorted, meaningful, and interpretable high-resolution maps, measured data have been processed to correct the bias, introduced by the nonlinearity of the device, as a function of height above ground and the topography. The comparative analysis of the apparent conductivity map, obtained by the properly processed EM31 data and some aerial photos that clearly documented the site history, has allowed unequivocal delineation of the landfill extent, in good agreement with the results obtained with other geophysical methods (not described in this paper) and with the ground truthing data provided by three boreholes, which were core-drilled at the end of the study at three locations selected on the basis of the apparent conductivity map.

show abstract

Integration of GIS, Electromagnetic and Electrical Methods in the Delimitation of Groundwater Polluted by Effluent Discharge (Salamanca, Spain): A Case Study

Cited by 9 publications

References 26 publications

Integrated Geophysical Data and GIS Technique to Forecast the Potential Groundwater Locations in Part of South Eastern Nigeria

Integrated Geophysical Data and GIS Technique to Forecast the Potential Groundwater Locations in Part of South Eastern Nigeria

Assessing the dam's stability of the pond at the ‘El Bosque’ renaissance garden (Béjar, Spain)

Frequency-Domain Electromagnetic Mapping of an Abandoned Waste Disposal Site: A Case in Sardinia (Italy)

Contact Info

Product

Resources

About