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The Utility of Integrated Ground Penetrating Radar-Electromagnetic Induction for Assessing the Relationship between Soil Water Saturation and Apparent Electrical Conductivity
Authors: Sashini Pathirana, Lakshman Galagedara, Christina Smeaton, Adrian Unc
Identifier: CSBE21802
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Published in: CSBE-SCGAB Technical Conferences » 5th CIGR and AGM Quebec City 2021 » Regular Sessions
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Description: Understanding the spatiotemporal variability of soil water saturation in agricultural fields is essential for devising efficient water management practices to support precision agriculture (PA). In hydrogeophysics, near-surface geophysical methods such as Ground Penetrating Radar (GPR) and Electromagnetic Induction (EMI) are used to determine the spatiotemporal variability of hydrological, physical, and chemical soil properties. The relationship between the apparent electrical conductivity (ECa) and water saturation is one component of the Archie?s equation and determination of this correlation with integrated EMI-GPR is a novel approach. Objectives of this study were to estimate the spatiotemporal variability of soil water saturation with GPR?s ground wave velocity (GWv) and to correlate the GPR estimated water saturation with EMI?s ECa. Field data were collected during irrigation and drainage under naturally varying compactions at the Pynn?s Brook Research Station, Pasadena, Newfoundland, Canada. Irrigation was applied at a rate of 0.13 cm/min for 15 min by considering the root depth as 20 cm. ECa and GWv data were collected using a multi-coil EMI sensor and a 500 MHz centre frequency GPR system, respectively. Spatiotemporal variability of saturation and ECa were mapped and their correlation assessed. Preliminary analyses suggest that ECa and GWv may serve as reliable proxies for soil water saturation under the tested wetting and drying conditions. The results of our feasibility study will advance the integration of the GPR and EMI methods (based on the Archie?s equation) in support of large-scale PA.
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Date: 2021-06-11
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Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: Soil and Water 2 - Soils Topics
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Type: Text.Abstract
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Publication type: Presentation
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Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
Notes:
Other files:
DOI:
Description: Understanding the spatiotemporal variability of soil water saturation in agricultural fields is essential for devising efficient water management practices to support precision agriculture (PA). In hydrogeophysics, near-surface geophysical methods such as Ground Penetrating Radar (GPR) and Electromagnetic Induction (EMI) are used to determine the spatiotemporal variability of hydrological, physical, and chemical soil properties. The relationship between the apparent electrical conductivity (ECa) and water saturation is one component of the Archie?s equation and determination of this correlation with integrated EMI-GPR is a novel approach. Objectives of this study were to estimate the spatiotemporal variability of soil water saturation with GPR?s ground wave velocity (GWv) and to correlate the GPR estimated water saturation with EMI?s ECa. Field data were collected during irrigation and drainage under naturally varying compactions at the Pynn?s Brook Research Station, Pasadena, Newfoundland, Canada. Irrigation was applied at a rate of 0.13 cm/min for 15 min by considering the root depth as 20 cm. ECa and GWv data were collected using a multi-coil EMI sensor and a 500 MHz centre frequency GPR system, respectively. Spatiotemporal variability of saturation and ECa were mapped and their correlation assessed. Preliminary analyses suggest that ECa and GWv may serve as reliable proxies for soil water saturation under the tested wetting and drying conditions. The results of our feasibility study will advance the integration of the GPR and EMI methods (based on the Archie?s equation) in support of large-scale PA.
Keywords:
Résumé:
Mots-clés:
Citation:
Volume:
Issue:
Pages -
Contributor:
Date: 2021-06-11
Technical field:
Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: Soil and Water 2 - Soils Topics
Other information:
Type: Text.Abstract
Format:
Publication type: Presentation
Source:
Relation:
Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
Notes:
Other files:
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