ABSTRACTElectrode spacing errors and errors correlated with the magnitude of the
observed potential are two key factors that affect the data quality for DC
resistivity imaging measurements. This paper investigates the properties and
effects of these two kinds of error on 2D resistivity imaging or inversion for
practical applications. By analytic analysis and numerical simulations, the
off‐line and... hiện toàn bộ
Javier Olona, J. A. Pulgar, Gabriela Fernández‐Viejo, Carlos López Fernández, J.M. González-Cortina
ABSTRACTMapping and distribution with depth of alteration in rocks is critical
in engineering planning because it has a fundamental impact on the geotechnical
properties of the materials. Lateral heterogeneity on a weathered rock massif
makes boreholes inadequate for its complete characterization. Geophysical
methods increase spatial sampling along the study area and can be related to
geotechnical... hiện toàn bộ
Philippe Cosenza, Ahmad Ghorbani, Christian Camerlynck, Fayçal Réjiba, R. Guérin, Alain Tabbagh
ABSTRACTThe paper reviews the effective medium theories used for modelling the
relationships between electromagnetic properties (low‐frequency conductivity and
high‐frequency permittivity) and hydrological variables (water content,
salinity, suction, permeability) in soils and rocks. It aims a) to provide a
simple presentation of these theoretical approaches, b) to present their
theoretical and pr... hiện toàn bộ
ABSTRACTResistivity imaging in combination with borehole information is a
powerful tool for site investigation. We show that the combination of 1D
laterally constrained inversion (1D‐LCI) with the use of a priori information
from borehole data and 2D smooth inversion adds significant value to the
interpretation of continuous vertical electrical sounding (CVES) data. The
1D‐LCI offers an analysis o... hiện toàn bộ
Andréa Teixeira Ustra, Lee Slater, Dimitrios Ntarlagiannis, Vagner Roberto Elis
ABSTRACTWe performed laboratory experiments to investigate the sensitivity of
the Spectral Induced Polarization (SIP) method to toluene contamination in
clayey soils. We used mixtures of quartzitic sand and montmorillonite as soil
samples, artificially contaminated with varying amounts of toluene. Care was
taken to quantify the experimental uncertainty resulting from packing since such
effects mus... hiện toàn bộ
ABSTRACTSubsidence of buildings situated on clay soils can be a serious
insurance problem in dry summers. In order to investigate subsidence and monitor
its progress, non‐invasive techniques that provide information on soil
properties have enormous potential. To help assess the application of new
electrical tomographic monitoring techniques, the electrical properties of seven
geographically extens... hiện toàn bộ
Khalissa Layadi, Fethi Semmane, Laëtitia Le Pourhiet
ABSTRACTChlef City, Algeria, which is located in the Lower Cheliff Basin, is
vulnerable to seismic hazards. Since there is no constrained velocity model for
the Lower Cheliff Basin, particularly at greater depths, we conducted an ambient
vibration investigation to map the shear‐wave velocity structure beneath the
city, with the primary goal of supplementing the existing microzonation studies.
Here... hiện toàn bộ
J. M. Martin, Mark E. Everett, Peter S.K. Knappett
ABSTRACTThis paper underscores the importance of spatially dense geophysical
data sets for making informed decisions in water management strategies. Such
decisions may require understanding how site‐specific subsurface architecture –
especially hydraulic connectivity – impacts the response of a shallow aquifer to
anthropogenic hydrologic disturbances (e.g. over‐pumping of a shallow aquifer).
At a ... hiện toàn bộ