Comparison of instruments for geoelectrical soil mapping at the field scale

Gebbers, Robin; Lück, Erika; Dabas, Michel; Domsch, Horst

doi:10.3997/1873-0604.2009011

Cited by 85 publications

(70 citation statements)

References 22 publications

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“…1). Percentages of sand (between 77.8 and 86.2 %), silt (between 8 and 14.8 %) and clay (between 4.8 and 9.4 %) always indicated this soil classification, in agreement with the previous work in the area nearby (Gebbers et al, 2009).…”

Section: Experimental Sitesupporting

confidence: 81%

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Integral quantification of seasonal soil moisture changes in farmland by cosmic-ray neutrons

Villarreyes

Baroni

Oswald

2011

Hydrol. Earth Syst. Sci.

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Abstract. Soil moisture at the plot or hill-slope scale is an important link between local vadose zone hydrology and catchment hydrology. However, so far only a few methods are on the way to close this gap between point measurements and remote sensing. One new measurement methodology that could determine integral soil moisture at this scale is the aboveground sensing of cosmic-ray neutrons, more precisely of ground albedo neutrons. The present study performed ground albedo neutron sensing (GANS) at an agricultural field in northern Germany. To test the method it was accompanied by other soil moisture measurements for a summer period with corn crops growing on the field and a later autumn-winter period without crops and a longer period of snow cover. Additionally, meteorological data and aboveground crop biomass were included in the evaluation. Hourly values of ground albedo neutron sensing showed a high statistical variability. Six-hourly values corresponded well with classical soil moisture measurements, after calibration based on one reference dry period and three wet periods of a few days each. Crop biomass seemed to influence the measurements only to minor degree, opposed to snow cover which has a more substantial impact on the measurements. The latter could be quantitatively related to a newly introduced field neutron ratio estimated from neutron counting rates of two energy ranges. Overall, our study outlines a procedure to apply the ground albedo neutron sensing method based on devices now commercially available, without the need for accompanying numerical simulations and suited for longer monitoring periods after initial calibration.

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Section: Experimental Sitesupporting

confidence: 81%

“…The landscape at the site was formed during the last ice age. Soil consists in the upper one meter of 75 % sand, 17.2 % silt and 7.8 % clay (Gebbers et al, 2009). Texture analysis was done for a number of nearsurface samples, and a loamy sand type is predominant in all 19 selected sampling locations (Fig.…”

Section: Experimental Sitementioning

confidence: 99%

Integral quantification of seasonal soil moisture changes in farmland by cosmic-ray neutrons

Villarreyes

Baroni

Oswald

2011

Hydrol. Earth Syst. Sci.

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“…Therefore, spatial changes in soil EC a have been linked to spatial soil heterogeneity [1][2][3][4]. In non-saline, non-hydromorphic mineral soils, the particle size distribution (soil texture) in combination with related soil attributes is typically the most influential factor for spatial variation of soil EC a [5], as smaller particles (clay and fine silt) are related to higher ion concentrations (greater surface charge) and superior water storage (smaller pore size).…”

Section: Introductionmentioning

confidence: 99%

Vertical Soil Profiling Using a Galvanic Contact Resistivity Scanning Approach

Pan

Adamchuk

Prasher

et al. 2013

Symposium on the Application of Geophysics to Engineering and Environmental Problems 2013

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Proximal sensing of soil electromagnetic properties is widely used to map spatial land heterogeneity. The mapping instruments use galvanic contact, capacitive coupling or electromagnetic induction. Regardless of the type of instrument, the geometrical configuration between signal transmitting and receiving elements typically defines the shape of the depth response function. To assess vertical soil profiles, many modern instruments use multiple transmitter-receiver pairs. Alternatively, vertical electrical sounding can be used to measure changes in apparent soil electrical conductivity with depth at a specific location. This paper examines the possibility for the assessment of soil profiles using a dynamic surface galvanic contact resistivity scanning approach, with transmitting and receiving electrodes configured in an equatorial dipole-dipole array. An automated scanner system was developed and tested in agricultural fields with different soil profiles. While operating in the field, the distance between current injecting and measuring pairs of rolling electrodes was varied continuously from 40 to 190 cm. The preliminary evaluation included a comparison of scan results from 20 locations to shallow (less than 1.2 m deep) soil profiles and to a two-layer soil profile model defined using an electromagnetic induction instrument.

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“…Gebbers et al (2009) compared data in the same area collected with various geoelectrical instruments for mapping at the field scale including a multi-electrode system, such as the SuperSting R8 used in this study, and a Veris mapper. They noted that comparison between instruments should only be made when the electrode spacing and signal depth of penetrations are the same.…”

Section: Electrical Resistivity Tomographymentioning

confidence: 99%

“…5C). The direct contact method is used for measuring surface geoelectrical properties at the field scale and has been used by numerous researchers (Gebbers et al, 2009;Molin and Faulin, 2013;Doolittle and Brevik, 2014). Higher EC a has been correlated to higher clay content in clay-pan soils .…”

Section: Electrical Conductivitymentioning

confidence: 99%