Electromagnetic Induction Techniques - Part 8

1998 ◽  
Author(s):  
PG Cook ◽  
BG Williams
Keyword(s):  
Electrical Conductivity ◽  
Case Studies ◽  
Electromagnetic Induction ◽  
Soil Profiles ◽  
Apparent Electrical Conductivity

Electromagnetic induction (EM) techniques are used in recharge/discharge studies by providing measurements of the apparent electrical conductivity of soil profiles. This booklet provides a summary of EM techniques that are most widely used. A number of case studies are presented which demonstrate the applications of the techniques to field problems.

scholarly journals Assessing the dynamics of soil salinity with time-lapse inversion of electromagnetic data guided by hydrological modelling

2021 ◽  
Vol 25 (3) ◽  
pp. 1509-1527
Author(s):  
Mohammad Farzamian ◽  
Dario Autovino ◽  
Angelo Basile ◽  
Roberto De Mascellis ◽  
Giovanna Dragonetti ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Soil Salinity ◽  
Electromagnetic Induction ◽  
Irrigation System ◽  
Time Lapse ◽  
Hydrological Modelling ◽  
Irrigated Agriculture ◽  
Field Assessment ◽  
Apparent Electrical Conductivity ◽  
Spatio Temporal

Abstract. Irrigated agriculture is threatened by soil salinity in numerous arid and semi-arid areas of the world, chiefly caused by the use of highly salinity irrigation water, compounded by excessive evapotranspiration. Given this threat, efficient field assessment methods are needed to monitor the dynamics of soil salinity in salt-affected irrigated lands and evaluate the performance of management strategies. In this study, we report on the results of an irrigation experiment with the main objective of evaluating time-lapse inversion of electromagnetic induction (EMI) data and hydrological modelling in field assessment of soil salinity dynamics. Four experimental plots were established and irrigated 12 times during a 2-month period, with water at four different salinity levels (1, 4, 8 and 12 dS m−1) using a drip irrigation system. Time-lapse apparent electrical conductivity (σa) data were collected four times during the experiment period using the CMD Mini-Explorer. Prior to inversion of time-lapse σa data, a numerical experiment was performed by 2D simulations of the water and solute infiltration and redistribution process in synthetic transects, generated by using the statistical distribution of the hydraulic properties in the study area. These simulations gave known spatio-temporal distribution of water contents and solute concentrations and thus of bulk electrical conductivity (σb), which in turn were used to obtain known structures of apparent electrical conductivity, σa. These synthetic distributions were used for a preliminary understanding of how the physical context may influence the EMI-based σa readings carried out in the monitored transects as well as being used to optimize the smoothing parameter to be used in the inversion of σa readings. With this prior information at hand, we inverted the time-lapse field σa data and interpreted the results in terms of concentration distributions over time. The proposed approach, using preliminary hydrological simulations to understand the potential role of the variability of the physical system to be monitored by EMI, may actually allow for a better choice of the inversion parameters and interpretation of EMI readings, thus increasing the potentiality of using the electromagnetic induction technique for rapid and non-invasive investigation of spatio-temporal variability in soil salinity over large areas.

Apparent electrical conductivity integrated from layered soil profiles

2009 ◽  
Vol 172 (2) ◽  
pp. 180-185 ◽  
Author(s):  
Dominik Bänninger ◽  
Hans Wunderli ◽  
Hannes Flühler
Keyword(s):  
Electrical Conductivity ◽  
Layered Soil ◽  
Soil Profiles ◽  
Apparent Electrical Conductivity

scholarly journals Measurement of apparent electrical conductivity of soil and the spatial variability of soil chemical properties by electromagnetic induction

2016 ◽  
Vol 11 (39) ◽  
pp. 3751-3762 ◽  
Author(s):  
Machado Siqueira Glecio ◽  
Dafonte Dafonte Jorge ◽  
Paz Gonzalez Antonio ◽  
Valcarcel Armesto Monteserrat ◽  
Farias de Franca e Silva Enio ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Spatial Variability ◽  
Electromagnetic Induction ◽  
Chemical Properties ◽  
Soil Chemical Properties ◽  
Apparent Electrical Conductivity

The use of electromagnetic induction to detect the spatial variability of the salt and clay contents of soils

Soil Research ◽  
1987 ◽  
Vol 25 (1) ◽  
pp. 21 ◽  
Author(s):  
BG Williams ◽  
D Hoey
Keyword(s):  
Electrical Conductivity ◽  
Spatial Variability ◽  
Electromagnetic Induction ◽  
New South ◽  
Clay Material ◽  
Soluble Salts ◽  
South Wales ◽  
Apparent Electrical Conductivity ◽  
Highly Correlated ◽  
Land Use Practices

The apparent electrical conductivity (EC,) of a 250 ha area of the Riverine Plain in New South Wales was mapped using a Geonics EM 34/3 electromagnetic terrain conductivity meter. The EC, values obtained were highly correlated with both the total soluble salts and the total <2 km clay material to a depth of 15 m. The spatial variability of both these properties has a direct bearing on present and future land-use practices.

Apparent Electrical Conductivity, Soil Properties and Spatial Covariance in the U.S. Southern High Plains

2005 ◽  
Vol 6 (3) ◽  
pp. 297-311 ◽  
Author(s):  
K. F. Bronson ◽  
J. D. Booker ◽  
S. J. Officer ◽  
R. J. Lascano ◽  
S. J. Maas ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Soil Properties ◽  
High Plains ◽  
Spatial Covariance ◽  
Southern High Plains ◽  
Apparent Electrical Conductivity ◽  
The U.S
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