Article
 

Calibration of soil moisture sensing with subsurface heated fiber optics using numerical simulation

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/articles/dj52w9557

Descriptions

Attribute NameValues
Creator
Abstract
  • The heat pulse probe method can be implemented with actively heated fiber optics (AHFO) to obtain distributed measurements of soil water content (θ) by using reported soil thermal responses measured by Distributed Temperature Sensing (DTS) and with a soil-specific calibration relationship. However, most reported applications have been calibrated to homogeneous soils in a laboratory, while inexpensive efficient in situ calibration procedures useful in heterogeneous soils are lacking. Here we employed the Hydrus 2-D/3-D code to define a soil-specific calibration curve. We define a 2-D geometry of the fiber optic cable and the surrounding soil media, and simulate heat pulses to capture the soil thermal response at different soil water contents. The model was validated in an irrigated field using DTS data from two locations along the FO deployment in which reference moisture sensors were installed. Results indicate that θ was measured with the model-based calibration with accuracy better than 0.022 m³ m⁻³.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Benítez‐Buelga, J., Rodríguez‐Sinobas, L., Sánchez Calvo, R., Gil‐Rodríguez, M., Sayde, C., & Selker, J. S. (2016). Calibration of soil moisture sensing with subsurface heated fiber optics using numerical simulation. Water Resources Research, 52(4), 2985-2995. doi:10.1002/2015WR017897
Journal Title
Journal Volume
  • 52
Journal Issue/Number
  • 4
Academic Affiliation
Rights Statement
Related Items
  • Data used in the tables and figures:
Funding Statement (additional comments about funding)
  • We also acknowledge the inter-ministerial commission of Science and Technology (CICYT) for their support at the project AGL2008-00153. The USA-NSF-supported Center For Transformative Environmental Monitoring Programs (CTEMPs.org) is thanked for their support of Selker and Sayde's participation in this project.
Publisher
Peer Reviewed
Language
Replaces

Relationships

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
file details Benitez-BuelgaCalibrationofSoilMoisture.pdf 2017-10-27 Public Download