Authors: Chameera Illawathura, Gary Parkin, Sebastien Lambot, Lakshman Galagedara
Identifier: CSBE19134
Download file:
Published in: CSBE-SCGAB Technical Conferences » AGM Vancouver 2019

Download RAW file:
DOI:
Description: The upper 30 cm of the soil profile, which hosts the majority of the root biomass, can be considered as the agricultural root zone of most temperate crops. The electromagnetic wave velocity in the soil obtained from reflection hyperbolas in ground penetrating radar (GPR) data can be used to estimate soil moisture (SM). Finding shallow hyperbolas in a radargram and minimizing the subjective error associated with the hyperbola fitting are the main challenges in this approach. Nevertheless, were motivated by the recent improvements of hyperbola-fitting algorithms, which can reduce the subjective error and processing time. To overcome the difficulty of finding very shallow hyperbolas, we applied the hyperbola-fitting method to reflections ranging from 27-50 cm depth using a 500 MHz center frequency GPR and compared the estimated SM with vertically installed, 30 cm long Time Domain Reflectometry (TDR) probe data. We also compared TDR and GPR sample areas in a 2-D plane using different GPR survey types and different hyperbola depths. SM measured with TDR and estimated with GPR were not significantly different according to Mann-Whitney?s test. Our analyses showed that the measured and the estimated SM has a root mean square error (RMSE) of 0.03 m3 m-3. In conclusion, the proposed method might be suitable to estimate SM with an acceptable accuracy in the root zone if the soil profile is fairly uniform within the application depth range.

Keywords: GPR, hyperbola fitting, root zone, soil moisture, TDR
Résumé:
Mots-clés:
Citation:
Volume:
Issue:
Pages -
Contributor:
Date: 2019-07-15
Technical field:
Conference name: CSBE/SCGAB 2019 Annual Conference, Vancouver, BC, 14-17 July 2019.
Session name: Environment

Other information:
Type: Presentation
Format:
Publication type: Text.Abstract
Source:
Relation:
Coverage: Canada
Language 1: en
Language 2:
Rights: Canadian Society for Bioengineering
Notes:
Other files: