The Measurement of Unfrozen Water Content by Time Domain Reflectometry PDF Download
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Author: D. E. Patterson
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
A portable, nondestructive method for measuring the unfrozen water content of frozen soils using time domain reflectometry (TDR) to measure the dielectric property.
Author: D. E. Patterson
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
A portable, nondestructive method for measuring the unfrozen water content of frozen soils using time domain reflectometry (TDR) to measure the dielectric property.
Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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Book Description
The results of a laboratory testing program, carried out to compare two independent methods for determining the unfrozen water content of soils, are described. With the time domain reflectometry method, the unfrozen water content is inferred from a calibration curve of apparent dielectric constant vs volumetric water content, determined by experiment. Previously, precise calibration of the TDR technique was hindered by the lack of a reference comparison method, which nuclear magnetic resonance now offers. This has provided a much greater scope for calibration, including a wide range of soil types and temperature (unfrozen water content). The results of the testing program yielded a relationship between dielectric constant and volumetric unfrozen water content that is largely unaffected by soil type, although a subtle but apparent dependency on the texture of the soil was noted. It is suggested that this effect originates from the lower valued dielectric constant for absorbed soil water. In spite of this, the general equation presented may be considered adequate for most practical purposes. The standard error of estimate is 0.015 cc/cc, although this may be reduced by calibrating for individual soils. Brief guidelines on system and probe design are offered to help ensure that use of the TDR method will give results consistent with the relationship presented. Keywords: Dielectric constant; Frozen soils; Soils tests; Time domain reflectometry. (edc).
Author: Daniel Edward Patterson
Publisher:
ISBN:
Category : Soil freezing
Languages : en
Pages : 138
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Book Description
Author: Michael W. Smith
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 24
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Book Description
Author: David J. Mulla
Publisher:
ISBN:
Category : Runoff
Languages : en
Pages : 178
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Author:
Publisher:
ISBN:
Category : Cold regions
Languages : en
Pages : 588
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Book Description
Author: Kevin M O'Connor
Publisher: CRC Press
ISBN: 1000101614
Category : Science
Languages : en
Pages : 417
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Book Description
GeoMeasurements by Pulsing TDR Cables and Probes examines Time Domain Reflectometry (TDR) research and provides information on its use as a robust, reliable, and economical production tool. Common uses for TDR technology include telecommunications and power industries, but the text examines applications such as measurement of moisture of unsaturated soils; detection of fluids for leak and pollution; measurement of water levels for hydrological purposes; measurement of water pressures beneath dams; and deformation and stability monitoring of mines, slopes, and structures. Chapters discuss: basic physics of signal generation, transmission, and attenuation along the coaxial cable probe designs and procedures for calibration as well as the variation in probe responses to changes in water content and soil mineralogy variations in waveform characteristics associated with cable, deformation, cable calibration, and installation techniques for metallic cables in rock several cases demonstrating the use of TDR cables in soil as well as weathered and soft rock a rationale for the use of compliant cable in soil the use of metallic cable (MTDR) and optical fiber (OTDR) to monitor response of structures sensor/transducer components, connections from the sensors to the TDR pulser/sampler, and system control methods available software for transmission and analysis of TDR signatures The diverse interest and terminology within the TDR community tends to obscure commonalities and the universal physical principles underlying the technology. The authors seek to crystallize the basic principles among the seemingly divergent specialties using TDR technology in geomaterials. By examining varied experiences, GeoMeasurements by Pulsing TDR Cables and Probes provides a synergistic text necessary to unify the field.
Author:
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Category : Plant-water relationships
Languages : en
Pages : 308
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 604
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Author:
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 348
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