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oai:mountainscholar.org:10217/881922025-12-30T03:30:03Zcom_10217_100532com_10217_100000com_10217_100434com_10217_100303col_10217_100536col_10217_100446

Farr, John Merritt, author Boyne, Harold S., advisor Smith, Freeman M. (Freeman Minson), 1939-, committee member Smith, James A., committee member 2007-01-03T05:48:07Z 2007-01-03T05:48:07Z 1982 1982_Summer_Farr_John.pdf ETDF1982400046GEOS http://hdl.handle.net/10217/88192 https://doi.org/10.25675/3.024697 This paper reports on the use of an FM-CW active microwave system, in a research mode, to remotely sense water equivalence and liquid water content of snowpacks. A three-component "electrical path length" dielectric mixture model is described which accounts for the microwave system response as a function of operating frequency, snow density and depth (water equivalence), and liquid water content. This physically based model is compared to currently accepted, semi-empirical mixture models and the limited data that exists. The "electrical path length" model compares favorably and has a distinctly simpler form than other models, making it workable for the specific problem addressed. It is concluded that by collecting data in two frequency ranges (just below the relaxation frequency of water), the depth of ice, the depth of liquid water, and thus the water equivalence of dry or wet snowpacks could be determined. Liquid water content determinations, made on a real-time basis, could then serve as invaluable melt-rate indexes for remote sites. Recommendations are given for the design configuration of an operational system, which could be incorporated into hydrometeorological data acquisition platforms such as SNOTEL. masters theses English eng Colorado State University. Libraries Catalog record number (MMS ID): 991005021669703361 GB2601.72.R42.F37 1980-1999 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. Snow -- Measurement Remote sensing Microwave measurements Measurement of snowpack properties using active FM-CW microwave systems Text Master of Science (M.S.) Masters Earth Resources Colorado State University This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). open.access