Calibration of Moisture Sensing with Subsurface Heated Fiber Optics using Numerical Simulation

Benítez Buelga, Javier and Sayde, C. and Rodríguez Sinobas, Leonor and Sánchez Calvo, Raúl (2016). Calibration of Moisture Sensing with Subsurface Heated Fiber Optics using Numerical Simulation. "Water Resources Research", v. 52 (n. 4); pp. 2985-2995. ISSN 0395-2037. https://doi.org/10.1002/2015WR017897.

Description

Title: Calibration of Moisture Sensing with Subsurface Heated Fiber Optics using Numerical Simulation
Author/s:
  • Benítez Buelga, Javier
  • Sayde, C.
  • Rodríguez Sinobas, Leonor
  • Sánchez Calvo, Raúl
Item Type: Article
Título de Revista/Publicación: Water Resources Research
Date: April 2016
ISSN: 0395-2037
Volume: 52
Subjects:
Faculty: E.T.S. de Ingeniería Agronómica, Alimentaria y de Biosistemas (UPM)
Department: Ingeniería Agroforestal
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainAGL2008‐00153UnspecifiedUnspecifiedUnspecified

More information

Item ID: 46350
DC Identifier: http://oa.upm.es/46350/
OAI Identifier: oai:oa.upm.es:46350
DOI: 10.1002/2015WR017897
Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2015WR017897/full
Deposited by: Memoria Investigacion
Deposited on: 02 Jun 2017 17:37
Last Modified: 04 Jun 2019 07:14
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