Mapping agricultural fields with GPR and EMI to identify offsite movement of agrochemicals

Yoder, R.; Freeland, R. S.; Ammons, J. T.; Leonard, L. L.

doi:10.1016/s0926-9851(01)00069-6

Cited by 51 publications

(36 citation statements)

References 19 publications

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“…precision agriculture) as described by Corwin and Lesch (2003). Many of these application areas are contained across a wide range of publication outlets such as those related to ground water (Scanlon et al, 1999), soil science (McNeil, 1992, Suddoth et al, 2010, precision agriculture (Sudduth, 2001), soil and water conservation (Doolittle et al, 1994;Kitchen et al, 1996), soil-crop dynamics and silage (Woodbury et al, 2009), environmental quality (Drommerhausen et al, 1995) and the application and movement of agrochemicals (Yoder et al, 2001). The use of such devices, for mapping site-specific attributes, is also incorporated into best-practice documents for land management within the European Community (Adhikari et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Low induction number, ground conductivity meters: A correction procedure in the absence of magnetic effects

Beamish

2011

Journal of Applied Geophysics

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Ground conductivity meters, comprising a variety of coil-coil configurations, are intended to operate within the limits provided by a low induction number (LIN), electromagnetic condition. They are now routinely used across a wide range of application areas and the measured apparent conductivity data may be spatially assembled and examined/correlated alongside information obtained from many other earth science, environmental, soil and land use assessments. The theoretical behaviour of the common systems is examined in relation to both the prevailing level of subsurface conductivity and the instrument elevation. It is demonstrated that, given the inherent high level of accuracy of modern instruments, the prevailing LIN condition may require operation in environments restricted to very low (<12 mS/m) conductivities. Beyond this limit, non-linear departures from the apparent conductivity that would be associated with a LIN condition occur and are a function of the coil configuration, the instrument height and the prevailing conductivity. Using both theory and experimental data, it is demonstrated that this has the potential to provide biased and spatially distorted measurements. A simple correction procedure that can be applied to the measured data obtained from any of the LIN instruments is developed. The correction procedure would, in the limit of a uniform subsurface, return the same (correct) conductivity, irrespective of the ground conductivity meter used, the prevailing conductivity or the measurement height.

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Section: Introductionmentioning

confidence: 99%

Low induction number, ground conductivity meters: A correction procedure in the absence of magnetic effects

Beamish

2011

Journal of Applied Geophysics

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“…This means that the slope, connectivity and drainage pattern of the channels needs to be mapped and overall fluxes understood. The draining water also leaches and transports salts and possible agrochemicals as shown previously through geophysical investigation (Yoder et al 2001) and direct sampling of soil water (Gunawardena et al 2011;Weaver et al 2013). Hydrologically, this means that palaeochannels are preferential flow paths in the landscape possibly providing rapid fluxes of water and chemicals to the catchment outlet in the same way as in soil profiles (Flury et al 1994).…”

Section: Summary and Management Implicationsmentioning

confidence: 71%

“…In this hydrological regime, these features are thought to pose a high risk of deep drainage (Triantafilis et al 2003), and therefore can have low irrigation water-use efficiency. Movement of related agrochemicals and nutrients (Yoder et al 2001) and rising local saline groundwater (Timms et al 2001) can further exacerbate environmental issues and lead to longterm negative consequences (Willis et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Hydrological and water-use efficiency implications of geomorphological stratification in palæochannels in the Northern Murray–Darling Basin

Vanags

Vervoort

2013

Crop Pasture Sci.

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Abstract. Regional climactic variability coupled with an increasing demand on water has placed an even greater pressure on managers to understand the complex relationships between surface water and groundwater in the Murray-Darling Basin. Based on limited soil sampling combined with geophysical observations, past research has suggested that relic subsurface drainage features (also known as palaeochannels) have a higher risk of deep drainage and lateral flow, particularly where water is impounded or applied as irrigation. The aim of this study was to investigate the hydrological behaviour of an irrigated 25-ha site in North-western New South Wales in more detail to predict deep drainage risk in the presence of palaeochannel systems. Several years of direct and indirect observations, including soil sampling and groundwater measures, were collected. Coupling the field data with one-and two-dimensional water balance models revealed a more complex behaviour where a palaeochannel functions like a large underground drain. In contrast to other studies, this study suggests that the actual palaeochannel does not pose a higher drainage risk, but the combination of the palaeochannels with the surroundings soils does have a higher deep drainage risk.

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“…Multi-frequency EMI surveys may be able to detect soil ECa changes, even below clay rich layers that are more impenetrable to GPR. Yoder et al (2001) used EMI surveys to identify areas of high ECa, and then conducted GPR surveys to obtain more detailed information in these areas of interest. The results of this study indicate that multi-frequency EMI surveys may be able to replace the need for two surveys depending on the information required and providing that soil ECa differences with depth are sufficient.…”

Section: Geophysics -Gpr and Multi-frequency Emi Surveysmentioning

confidence: 99%

Geophysics and Wine in New Zealand

Imre¹,

Mauk²

2011

Earth and Environmental Sciences

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Mapping agricultural fields with GPR and EMI to identify offsite movement of agrochemicals

Cited by 51 publications

References 19 publications

Low induction number, ground conductivity meters: A correction procedure in the absence of magnetic effects

Low induction number, ground conductivity meters: A correction procedure in the absence of magnetic effects

Hydrological and water-use efficiency implications of geomorphological stratification in palæochannels in the Northern Murray–Darling Basin

Geophysics and Wine in New Zealand

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