Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3484zm123

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  • Water conservation and water quality are rapidly increasing in importance in all areas of the world. The ability to accurately measure soil water content and salinity, over a wide variety of conditions, is key to meeting this need. A set of forward prediction models and waveform interpretation algorithms to extract Volumetric Water Content (WC) and Electrical Conductivity (EC) profiles vs. position and time for electrically lossy and dispersive geophysical and biological media are presented. These are applicable to both Time Domain and Frequency Domain Electromagnetic Wave Propagation Transmission and Reflection measurements. These forward prediction models are developed using physically based First Principles models from the Theory of Electromagnetics together with Scattering (S) Parameter and Transmission (T) Parameter network modeling techniques applied to wave propagation in various media with cascaded domains of different properties. The interpretation algorithms fit the pre-derived Forward Prediction models to the measurement data via lookup tables, interpolation and optimization methods. Presented applications include the transmission line methods of Time Domain Reflectometry, Time Domain Transmission, Frequency Domain Reflectometry and Frequency Domain Transmission including high dynamic range Frequency Domain Vector Network Analysis. Other applications include Ground Penetrating Radar and Microwave Remote Sensing. The models account for temporal and spatial heterogeneity to obtain WC and EC vs. time and position. Models are introduced for composite media with multiple constituents of varying Ohmic (EC) and dielectric (electric permittivity) properties accounting for dispersive frequency dependence and loss. These models interpolate between the physical upper and lower bounds of parallel and serial influences of each of the capacitive and conductive constituents. New models are also introduced accounting for charged interfaces and resulting bound and semi-bound water constituents within the pore spaces of soils containing clay or organic matter fractions resulting in a transition zone from bound to free water (via a semi-bound water zone) impacting the frequency dependence on electric permittivity. Validations of the models are presented via comparisons to actual measured data over wide ranges of water content, electrical conductivity and soil types.
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  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2013-06-26T20:31:38Z (GMT) No. of bitstreams: 2 license_rdf: 1527 bytes, checksum: d4743a92da3ca4b8c256fdf0d7f7680f (MD5) FlugstadBenjaminA2013.pdf: 31787647 bytes, checksum: 0d374a886782e2698a6bfdfe4693f4f2 (MD5)
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  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Your ScholarsArchive@OSU submission has been rejected because you attached a CC0 or Public Domain License to your work. These licenses mean that you have "dedicated the work to the public domain by waiving all of your rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. Others can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission." We strongly suggest that you don't attach either of these licenses. We're assuming you probably meant to add a Creative Commons license to your work so that others could use it, but you intended to retain your copyrights. Please re-submit* your work and choose "Creative Commons License" from the License Type drop down box. You'll then be asked two questions about how you want people to use your work. You can also choose "No Creative Commons License". *To re-submit your work, log into ScholarsArchive@OSU. Your rejected submission will be in your Submissions & Tasks work file. You can just resume the submission. All your information will still be in the form; you need to change only the CC License page. If you have any questions or concerns, please contact Sue Kunda: sue.kunda@oregonstate.edu OR 541-737-7262. Can you check to see if students have selected a CC0 or a Public Domain license before approving? And if they have selected one of these licenses, reject with the above language? Also, you may want to change #23 of the thesis submission instructions to: 23. Creative Commons License: DO NOT SELECT PUBLIC DOMAIN OR CCO. You may add a Creative Commons License to your item that allows copyrighted works to be shared and re-used. Either select License Type: Creative Commons or License Type: No Creative Commons License. Click Next. on 2013-06-24T21:42:18Z (GMT)
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