Degree Type

Thesis

Date of Award

2015

Degree Name

Master of Science

Department

Agronomy

First Advisor

Robert Horton

Abstract

Time domain reflectometry (TDR) is a well-established electromagnetic technique used to estimate in situ soil water content, and thermo-TDR is an extension of the traditional TDR, which can measure both soil water content and thermal properties. Tangent line methods and adaptive waveform interpretation with Gaussian filters (AWIGF) are used in traditional TDR waveform analysis. However, due to the short probe design of thermo-TDR, those methods may not perform well.

In this thesis, we present an alternative method in TDR waveform analysis based on the second order bounded mean oscillation (BMO) operator. Numerical analysis and laboratory calibration tests show that the second order BMO can return reasonable results compared with tangent line methods and AWIGF. Second order BMO analysis also performs well for some challenging waveforms. The second order BMO method is not totally automatic due to the large variation of TDR waveforms, and manual adjustment of some parameters is necessary. A MATLAB program of the implementation of second order BMO method is developed, and instructions for users of the program is also provided. The results show that second order BMO is a valid alternative method for TDR waveform analysis.

DOI

https://doi.org/10.31274/etd-180810-4017

Copyright Owner

Zhuangji Wang

Language

en

File Format

application/pdf

File Size

41 pages

Included in

Soil Science Commons

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