The Use of Geophysical Imaging to Identify Subsurface Soil Textural Patterns
Location
ECC 307/309
Event Website
https://water.usu.edu/
Start Date
4-1-2008 11:00 AM
End Date
4-1-2008 11:15 AM
Description
Knowledge of the spatial distribution of soil textural features is important for determining soil moisture storage and soil hydraulic transport properties. Geophysical methods, in particular electromagnetic induction (EMI) surveys, are being used to infer soil spatial heterogeneity at the field scale due to their non-destructive nature, rapid response and ease of integration onto mobile vehicular measurement platforms. From EMI measurements the soil apparent electrical conductivity (ECa) is acquired and can be related to a number of soil properties including: soil salinity, moisture content, and texture. We present the use of EMI mapping to identify subtle changes in subsurface architecture at two different study sites. A 50 x 50 m agricultural field was mapped using a DUALEM-1S ground conductivity meter on multiple days with different field soil water contents. Temporal stability analysis was then used to separate the response due to water content change from static textural properties to delineate management zones. We also applied EMI mapping on a 38ha watershed to identify subsurface patterns and networks. These EMI maps reveal the spatial distribution of time-invariant subsurface properties and are informative for modeling and experimental design purposes in ecological, environmental and agricultural applications
The Use of Geophysical Imaging to Identify Subsurface Soil Textural Patterns
ECC 307/309
Knowledge of the spatial distribution of soil textural features is important for determining soil moisture storage and soil hydraulic transport properties. Geophysical methods, in particular electromagnetic induction (EMI) surveys, are being used to infer soil spatial heterogeneity at the field scale due to their non-destructive nature, rapid response and ease of integration onto mobile vehicular measurement platforms. From EMI measurements the soil apparent electrical conductivity (ECa) is acquired and can be related to a number of soil properties including: soil salinity, moisture content, and texture. We present the use of EMI mapping to identify subtle changes in subsurface architecture at two different study sites. A 50 x 50 m agricultural field was mapped using a DUALEM-1S ground conductivity meter on multiple days with different field soil water contents. Temporal stability analysis was then used to separate the response due to water content change from static textural properties to delineate management zones. We also applied EMI mapping on a 38ha watershed to identify subsurface patterns and networks. These EMI maps reveal the spatial distribution of time-invariant subsurface properties and are informative for modeling and experimental design purposes in ecological, environmental and agricultural applications
https://digitalcommons.usu.edu/runoff/2008/AllAbstracts/41