DETECTION OF THE END POINT OF THE CHANNEL IN IMPROVEMENT BODY AFTER CHEMICAL GROUTING USING ELECTRICAL RESISTIVITY MONITORING BY THE TIME-LAPSE ANALYSIS METHOD

2020 ◽  
Vol 76 (2) ◽  
pp. I_34-I_48
Author(s):  
Tomoaki SHIMIZU ◽  
Hiroyuki AZUMA ◽  
Yoshiya ODA
Keyword(s):  
Electrical Resistivity ◽  
Time Lapse ◽  
Analysis Method ◽  
Chemical Grouting ◽  
End Point

Monitoring the hydrologic behaviour of a mountain slope via time‐lapse electrical resistivity tomography

2009 ◽  
Vol 7 (5-6) ◽  
pp. 475-486 ◽  
Author(s):  
G. Cassiani ◽  
A. Godio ◽  
S. Stocco ◽  
A. Villa ◽  
R. Deiana ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Time Lapse ◽  
Mountain Slope ◽  
Resistivity Tomography

scholarly journals Visualization of conduit‐matrix conductivity differences in a karst aquifer using time‐lapse electrical resistivity

2012 ◽  
Vol 39 (24) ◽  
Author(s):  
Steven B. Meyerhoff ◽  
Marios Karaoulis ◽  
Florian Fiebig ◽  
Reed M. Maxwell ◽  
André Revil ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Karst Aquifer ◽  
Time Lapse

scholarly journals Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer

2019 ◽  
Author(s):  
Andrea Palacios ◽  
Juan José Ledo ◽  
Niklas Linde ◽  
Linda Luquot ◽  
Fabian Bellmunt ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Seawater Intrusion ◽  
Electrical Resistivity Tomography ◽  
Low Cost ◽  
Heavy Rain ◽  
Time Lapse ◽  
Resistivity Tomography ◽  
Bulk Electrical Conductivity ◽  
Spatial Coverage

Abstract. Surface electrical resistivity tomography (ERT) is a widely used tool to study seawater intrusion (SWI). It is noninvasive and offers a high spatial coverage at a low cost, but it is strongly affected by decreasing resolution with depth. We conjecture that the use of CHERT (cross-hole ERT) can partly overcome these resolution limitations since the electrodes are placed at depth, which implies that the model resolution does not decrease in the zone of interest. The objective of this study is to evaluate the CHERT for imaging the SWI and monitoring its dynamics at the Argentona site, a well-instrumented field site of a coastal alluvial aquifer located 40 km NE of Barcelona. To do so, we installed permanent electrodes around boreholes attached to the PVC pipes to perform time-lapse monitoring of the SWI on a transect perpendicular to the coastline. After two years of monitoring, we observe variability of SWI at different time scales: (1) natural seasonal variations and aquifer salinization that we attribute to long-term drought and (2) short-term fluctuations due to sea storms or flooding in the nearby stream during heavy rain events. The spatial imaging of bulk electrical conductivity allows us to explain non-trivial salinity profiles in open boreholes (step-wise profiles really reflect the presence of fresh water at depth). By comparing CHERT results with traditional in situ measurements such as electrical conductivity of water samples and bulk electrical conductivity from induction logs, we conclude that CHERT is a reliable and cost-effective imaging tool for monitoring SWI dynamics.

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