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


Authors: Benitez-Buelga
Owners: CTEMPs OSU-UNR
Resource type:Composite Resource
Created:Mar 31, 2018 at 8:02 p.m.
Last updated: Apr 09, 2018 at 8:37 p.m. by CTEMPs OSU-UNR

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.

Raw project data is available by contacting ctemps@unr.edu

Subject Keywords

DTS,heated fiber optics,distributed temperature sensing,CTEMPs

How to cite

Benitez-Buelga (2018). Calibration of soil moisture sensing with subsurface heated fiber optics using numerical simulation, HydroShare, http://www.hydroshare.org/resource/946b190166994cf2a024e7199386bea3

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
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Name Organization Address Phone Author Identifiers
Benitez-Buelga

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