Mapping Clay Content across Boundaries at the Landscape Scale with Electromagnetic Induction

2007 ◽  
Vol 71 (6) ◽  
pp. 1740-1747 ◽  
Author(s):  
U. Weller ◽  
M. Zipprich ◽  
M. Sommer ◽  
W. Zu Castell ◽  
M. Wehrhan
Keyword(s):  
Electromagnetic Induction ◽  
Clay Content ◽  
Landscape Scale

scholarly journals Repeated electromagnetic induction measurements for mapping soil moisture at the field scale: validation with data from a wireless soil moisture monitoring network

2017 ◽  
Vol 21 (1) ◽  
pp. 495-513 ◽  
Author(s):  
Edoardo Martini ◽  
Ulrike Werban ◽  
Steffen Zacharias ◽  
Marco Pohle ◽  
Peter Dietrich ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Soil Moisture ◽  
Spatial Pattern ◽  
Soil Properties ◽  
Electromagnetic Induction ◽  
Scale Validation ◽  
Low Cost ◽  
Monitoring Network ◽  
Clay Content ◽  
Temporal Variations

Abstract. Electromagnetic induction (EMI) measurements are widely used for soil mapping, as they allow fast and relatively low-cost surveys of soil apparent electrical conductivity (ECa). Although the use of non-invasive EMI for imaging spatial soil properties is very attractive, the dependence of ECa on several factors challenges any interpretation with respect to individual soil properties or states such as soil moisture (θ). The major aim of this study was to further investigate the potential of repeated EMI measurements to map θ, with particular focus on the temporal variability of the spatial patterns of ECa and θ. To this end, we compared repeated EMI measurements with high-resolution θ data from a wireless soil moisture and soil temperature monitoring network for an extensively managed hillslope area for which soil properties and θ dynamics are known. For the investigated site, (i) ECa showed small temporal variations whereas θ varied from very dry to almost saturation, (ii) temporal changes of the spatial pattern of ECa differed from those of the spatial pattern of θ, and (iii) the ECa–θ relationship varied with time. Results suggest that (i) depending upon site characteristics, stable soil properties can be the major control of ECa measured with EMI, and (ii) for soils with low clay content, the influence of θ on ECa may be confounded by changes of the electrical conductivity of the soil solution. Further, this study discusses the complex interplay between factors controlling ECa and θ, and the use of EMI-based ECa data with respect to hydrological applications.

scholarly journals Repeated electromagnetic induction measurements for mapping soil moisture at the field scale: validation with data from a wireless soil moisture monitoring network

2016 ◽  
Author(s):  
Edoardo Martini ◽  
Ulrike Werban ◽  
Steffen Zacharias ◽  
Marco Pohle ◽  
Peter Dietrich ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Soil Moisture ◽  
Spatial Pattern ◽  
Soil Properties ◽  
Electromagnetic Induction ◽  
Scale Validation ◽  
Monitoring Network ◽  
Clay Content ◽  
Temporal Variations ◽  
Dynamic Factor

Abstract. Electromagnetic induction (EMI) measurements are widely used for soil mapping, as they allow fast and relatively low-cost surveys of soil apparent electrical conductivity (ECa). Although the use of non-invasive EMI for imaging spatial soil properties is very attractive, the dependence of ECa on several factors challenges any interpretation with respect to individual soil properties or states such as soil moisture (θ). The major aim of this study was to further investigate the potential of repeated EMI measurements to map θ, with particular focus on the temporal variability of the spatial patterns of ECa and θ. To this end, we compared repeated EMI measurements with high-resolution θ data from a wireless soil moisture and soil temperature monitoring network for an extensively managed hillslope area for which soil properties and θ dynamics are known. For the investigated site, i) ECa showed small temporal variations whereas θ varied from very dry to almost saturation; ii) temporal changes of the spatial pattern of ECa differed from those of the spatial pattern of θ; and iii) the ECa-θ relationship varied with time. Results suggest that i) stable soil properties are the major control on ECa measured with EMI, and ii) for soils with low clay content, the electrical conductivity of the soil solution rather than θ is likely to be the dynamic factor controlling temporal variations of ECa. Further, our study provides the opportunity to discuss the complex interplay between factors controlling ECa and θ, and the use of EMI-based ECa data with respect to hydrological applications.

A spatially constrained 1D inversion algorithm for quasi-3D conductivity imaging: Application to DUALEM-421 data collected in a riverine plain

Geophysics ◽  
2011 ◽  
Vol 76 (2) ◽  
pp. B43-B53 ◽  
Author(s):  
Fernando Acácio Monteiro Santos ◽  
John Triantafilis ◽  
Kira Bruzgulis
Keyword(s):  
Electromagnetic Induction ◽  
Clay Content ◽  
Agricultural Systems ◽  
Stream Channel ◽  
Inversion Algorithm ◽  
Vertical Extent ◽  
Murray Darling Basin ◽  
Imaging Application ◽  
Em Induction ◽  
Conductivity Imaging

The efficient use of water in irrigated agricultural systems is of increasing importance given the changes in climatic patterns currently being experienced in the irrigated areas of the Murray-Darling Basin (MDB) in Australia. In previous research, electromagnetic (EM) induction instruments have been used to map the distribution of the clay content in those areas. However, describing their vertical extent and connectivity with groundwater tables or stratigraphic features such as paleochannels has not been studied adequately. One of the reasons for the paucity of research is the lack of suitable instrumentation or software to invert apparent conductivity (σa) data. The aim of this research is to demonstrate how DUALEM-421 equipment, which operates using electromagnetic induction theory, can be used to map not only the areal distribution of a prior stream channel but its vertical extent by inputting the data into a 1D spatially constrained algorithm for quasi-3D conductivity imaging. We discovered how the inversion of the apparent electrical conductivity, measured in the horizontal (HCP) and perpendicular (PRP) arrays, characterizes the Quaternary alluvial clays which dominate the riverine plain of the lower Gwydir valley, and indicates the location and extent of a prior stream channel and its sediments across Auscott Midkin field 11. We found the calculated conductivity values favorably represent the known stratigraphy of these physiographic units. Our results suggest the prior stream channel may be interconnected with a more extensive paleochannel.

Landscape-Scale Restoration of the Longleaf Pine Ecosystem

1998 ◽  
Vol 16 (1) ◽  
pp. 41-45
Author(s):  
Rhett Johnson ◽  
Dean Gjerstad
Keyword(s):  
Longleaf Pine ◽  
Landscape Scale

Electron excess and electromagnetic induction effect of extensive air showers

2010 ◽  
Vol 16 (3) ◽  
pp. 3-14 ◽  
Author(s):  
V.M. Kartashev ◽  
◽  
P.S. Kizim ◽  
V.E. Kovtun ◽  
S.N. Stervoiedov ◽  
...  
Keyword(s):  
Electromagnetic Induction ◽  
Extensive Air Showers ◽  
Induction Effect ◽  
Air Showers

Energetic relationships for crushing of soil clods

2006 ◽  
Vol 2 (1) ◽  
pp. 51-72
Author(s):  
István Patay ◽  
Virág Sándor
Keyword(s):  
Moisture Content ◽  
Specific Energy ◽  
Soil Moisture Content ◽  
Energy Requirement ◽  
Clay Content ◽  
Clay Soils ◽  
Rigid Support ◽  
Soil Plasticity ◽  
Specific Energy Requirement ◽  
The Relationship

Clod crushing is a principal problem with soils of high clay content. Therefore, there is a need for determining the conditions for clod breaking and clod crushing. The objective of the work was to develop a special purpose tool for single clod breaking both by rigid support of the clod and by a single clod supported by soil and to develop a machine for clod crushing. Furthermore, the purpose was to determine the relationship between the specific energy requirement for clod crushing in the function of soil plasticity and the soil moisture content by the means of the developed tool and machine. The main result of the experiments is summarized in a 3D diagram where the specific energy requirement for soil clod crushing is given in the function of the moisture content and the plasticity index for different clay soils.

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