Characterizing the ageing of a geosynthetic clay liner through electrical resistivity

2016 ◽  
Vol 53 (3) ◽  
pp. 423-430 ◽  
Author(s):  
C. Sirieix ◽  
F. Genelle ◽  
C. Barral ◽  
N. Touze-Foltz ◽  
J. Riss ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Weather Conditions ◽  
Water Infiltration ◽  
Resistivity Tomography ◽  
Geosynthetic Clay Liner ◽  
Factors Affecting ◽  
Clay Liner ◽  
Top Soil ◽  
Hazardous Waste Landfills ◽  
Calcium Bentonite

In closed hazardous waste landfills, impermeable layered covers mainly composed of clays, geosynthetic clay liner (GCL) or geomembrane, etc. are used to seal in the waste to minimize water infiltration and accumulation of leachate inside the waste. An experimental site of landfill cap was realized with sodium-activated calcium bentonite GCL at a depth of 0.45 m covered by gravels and top soil. The monitoring of this site was performed during 32 months with measurements of weather conditions, and electrical resistivity tomography (ERT) and geotechnical measurements at the end of the monitoring. The two different methods underlined that the GCL’s electrical resistivity decreased after 22 months subsequent to its installation; moreover, it was possible to detect the defects that had been made in the GCL prior to closure, to simulate factors affecting GCL performance. Thereby the analyses made on the GCL samples taken at two locations in the vicinity of the ERT profile highlighted changes in the intrinsic properties of the material. Changes in the proportion of sodium and calcium cations occurred and its hydraulic conductivity increased from 5 × 10−11 to 3 × 10−6 m/s. Thus, this study shows that electrical resistivity is suitable to characterize the ageing of a GCL.

Factors affecting the hydraulic performance of a geosynthetic clay liner overlap

2020 ◽  
Vol 271 ◽  
pp. 110978
Author(s):  
I.A. Weerasinghe ◽  
C. Gallage ◽  
L. Dawes ◽  
P. Kendall
Keyword(s):  
Hydraulic Performance ◽  
Geosynthetic Clay Liner ◽  
Factors Affecting ◽  
Clay Liner

scholarly journals Imaging artificial salt water infiltration using electrical resistivity tomography constrained by geostatistical data

2012 ◽  
Vol 438-439 ◽  
pp. 168-180 ◽  
Author(s):  
Thomas Hermans ◽  
Alexander Vandenbohede ◽  
Luc Lebbe ◽  
Roland Martin ◽  
Andreas Kemna ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Salt Water ◽  
Water Infiltration ◽  
Resistivity Tomography

scholarly journals Hydrogeophysical Assessment of the Critical Zone below a Golf Course Irrigated with Reclaimed Water close to Volcanic Caldera

Water ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2400
Author(s):  
Alex Sendrós ◽  
Mahjoub Himi ◽  
Esmeralda Estévez ◽  
Raúl Lovera ◽  
M. Pino Palacios-Diaz ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Hydraulic Properties ◽  
Electrical Resistivity Tomography ◽  
Reclaimed Water ◽  
Geophysical Methods ◽  
Water Infiltration ◽  
Golf Course ◽  
Pyroclastic Deposits ◽  
Undisturbed Soil ◽  
Resistivity Tomography

The geometry and the hydraulic properties of the unsaturated zone is often difficult to evaluate from traditional soil sampling techniques. Soil samples typically provide only data of the upper layers and boreholes are expensive and only provide spotted information. Non-destructive geophysical methods and among them, electrical resistivity tomography can be applied in complex geological environments such as volcanic areas, where lavas and unconsolidated pyroclastic deposits dominate. They have a wide variability of hydraulic properties due to textural characteristics and modification processes suh as compaction, fracturation and weathering. To characterize the subsurface geology below the golf course of Bandama (Gran Canaria) a detailed electrical resistivity tomography survey has been conducted. This technique allowed us to define the geometry of the geological formations because of their high electrical resistivity contrasts. Subsequently, undisturbed soil and pyroclastic deposits samples were taken in representative outcrops for quantifying the hydraulic conductivity in the laboratory where the parametric electrical resistivity was measured in the field. A statistical correlation between the two variables has been obtained and a 3D model transit time of water infiltration through the vadose zone has been built to assess the vulnerability of the aquifers located below the golf course irrigated with reclaimed water.

scholarly journals Determination of shear surface of landslides using electrical resistivity tomography

2014 ◽  
Vol 44 (2) ◽  
pp. 133-147 ◽  
Author(s):  
Ivan Dostál ◽  
René Putiška ◽  
David Kušnirák
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Geophysical Methods ◽  
Inverse Image ◽  
Slope Deformation ◽  
L1 Norm ◽  
Resistivity Tomography ◽  
Factors Affecting ◽  
L2 Norm ◽  
Landslide Body

Abstract Geophysical methods offer a broad spectrum of information by dealing with slope deformations. The electrical resistivity tomography (ERT) method is mainly applied for spatial localization of the landslide body and depicting the shear zone position. This article presents the application of the ERT method for the landslide hazardous areas by means of numerical modelling. Four different synthetic models with very small resistivity contrast (30 Ohm.m/50 Ohm.m), where each model represents a different type of slope deformation, were tested by several factors affecting the final inverse model: measurement point density, L1 and L2 norm and L-norm roughness filter components. The higher measurement points density helps mainly to detect the boundaries at greater depths. Inverse models computed using the L1 norm bring satisfactory results for compact anomalous bodies, i.e. water saturated landslide body. In the case of subtle conductive zones, i.e. shear planes, the L2 norm based inversion is recommended. For enhanced reconstruction of skewed anomalous objects, roughness filter including a diagonal component produces more accurate inverse image. The article also demonstrates the ability of the ERT method to detect and describe the shape of the slope deformation even by a relative subtle resistivity contrast

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