Event Title

Delineating Soil-Texture Features Using Electromagnetic Induction Mapping

Presenter Information

Hiruy Abdu

Location

ECC 303/305

Event Website

http://water.usu.edu/htm/conference/past-spring-runoff-conferences

Start Date

5-4-2007 10:50 AM

End Date

5-4-2007 11:10 AM

Description

Electromagnetic induction (EMI) surveys are used to infer soil spatial heterogeneity at the field scale. 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. EMI surveying is gaining wider use because of its nondestructive nature, rapid response and the ease of integration onto a mobile platform. Even though EMI surveys have been soundly applied to investigate soil salinity and moisture, its application in texture mapping is still in development. The objective of this study is to apply EMI mapping to delineate a gravel lens in an otherwise homogenous plot. The study area is a 40 x 50 m field with Millville silt-loam soil (Coarse-silty, carbonatic, mesic Typic Haploxeroll) at the Utah State University’s Greenville Farm. The DUALEM 1-S ground conductivity meter and a Trimble ProXT GPS unit were used to make non-invasive geo-referenced EMI measurements at four different days. A set of 11 TDR probes coupled with thermocouples were inserted into a soil profile close to the field from 0.05 to 2.0 m below the ground surface to collect water content, ECa and temperature information. Since soil texture is a time-invariant property, temporal stability analysis is applied to the four EMI maps to delineate the irregular region. The motivation of this study is to better understand repeated EMI mapping for the investigation of timeinvariant subsurface properties.

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Apr 5th, 10:50 AM Apr 5th, 11:10 AM

Delineating Soil-Texture Features Using Electromagnetic Induction Mapping

ECC 303/305

Electromagnetic induction (EMI) surveys are used to infer soil spatial heterogeneity at the field scale. 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. EMI surveying is gaining wider use because of its nondestructive nature, rapid response and the ease of integration onto a mobile platform. Even though EMI surveys have been soundly applied to investigate soil salinity and moisture, its application in texture mapping is still in development. The objective of this study is to apply EMI mapping to delineate a gravel lens in an otherwise homogenous plot. The study area is a 40 x 50 m field with Millville silt-loam soil (Coarse-silty, carbonatic, mesic Typic Haploxeroll) at the Utah State University’s Greenville Farm. The DUALEM 1-S ground conductivity meter and a Trimble ProXT GPS unit were used to make non-invasive geo-referenced EMI measurements at four different days. A set of 11 TDR probes coupled with thermocouples were inserted into a soil profile close to the field from 0.05 to 2.0 m below the ground surface to collect water content, ECa and temperature information. Since soil texture is a time-invariant property, temporal stability analysis is applied to the four EMI maps to delineate the irregular region. The motivation of this study is to better understand repeated EMI mapping for the investigation of timeinvariant subsurface properties.

http://digitalcommons.usu.edu/runoff/2007/AllAbstracts/14