Masters Theses

Yunyi Guan

Keywords and Phrases

Dielectric permittivity; GPR; Guided wave; MATLAB; Phase velocity; Thickness estimation

Abstract

"This study was conducted to investigate how limiting the allowable velocity range when analyzing guided wave data will affect the results of dielectric permittivity and thickness estimation. We conducted four sets of Experiments: an underlying layer of saturated organic loam is covered by incremental layers of the dry organic loam; a base layer of dry organic loam covered by the saturated organic loam; a saturated basal layer of silt with overlying dry silt layers, and a base layer of dry silt overlain by saturated silt layers to conduct a comparative study and perform three surveys for each of these three frequencies at 250 MHz, 500 MHz, and 1000 MHz It is concluded that from the aspect of water content, the location of the selected points has no effect on the final result; and from the aspect of soil structure, in most cases, for organic loam layers, the lower the starting phase velocity, the more accurate the results; for silt layers, the pattern is the opposite, the higher the starting point, the more accurate the results. For the fundamental mode, choosing the maximum starting phase velocity is usually best or equivalent to choosing a lower starting phase velocity. For some wet soils that have low attenuation, it may be better to choose a lower starting phase velocity. The error of inversion is less for lower starting phase velocities, so this should be considered when evaluating the accuracy of inversion estimates"--Abstract, page iii.

Advisor(s)

Grote, Katherine R.

Committee Member(s)

Anderson, Neil L. (Neil Lennart), 1954-
Rogers, J. David

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geological Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2018

Pagination

x, 47 pages

Note about bibliography

Includes bibliographical references (pages 45-46).

Rights

© 2018 Yunyi Guan, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 11420

Electronic OCLC #

1084477917

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