Determining Soil Volumetric Moisture Content Using Time Domain Reflectometry

United States. Federal Highway Administration

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Determining Soil Volumetric Moisture Content Using Time Domain Reflectometry

1998-02-01
By United States. Federal Highway Administration

[PDF-3.98 MB]

English

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Details:

Corporate Creators:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Dielectric Constant Dielectric Properties Insitu Methods Moisture Content Soils Time Domain Reflectometers Time Domain Reflectometry (TDR) Volumetric Analysis
Publication/ Report Number:

FHWA-RD-97-I 39
Resource Type:

Research Paper
Geographical Coverage:

United States
TRIS Online Accession Number:

00758028
Corporate Publisher:

United States. Federal Highway Administration
NTL Classification:

NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology
Abstract:

Time domain reflectometry (TDR) is a technique used to measure indirectly the in situ volumetric moisture content of soil. Current research provides a variety of prediction equations that estimate the volumetric moisture content using the dielectric constant calculated from the apparent length obtained from the TDR reader. However, very limited research exists regarding which of several available procedures should be used to obtain the apparent length of the TDR response for use in calculating the dielectric constant. The purpose of this study is to enhance the predictive accuracy of in situ volumetric moisture content estimation from TDR measurements. The study is divided into two phases. The initial phase evaluates the five known methods of analyzing the apparent length of TDR responses to determine which provides the most accurate method for estimating the volumetric moisture content. Phase II, through a mixing model form, regresses the volumetric properties of the soil and the apparent length of the TDR response to obtain a predicted volumetric moisture content.
Format:

PDF
Collection(s):

Federal Highway Administration US Transportation Collection
Main Document Checksum:

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urn:sha256:42eef9fbf512183784e63fc835c72882288f8ce3d60d66eff4b033992f4a6d5b
Download URL:

https://rosap.ntl.bts.gov/view/dot/13771/dot_13771_DS1.pdf
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Determining Soil Volumetric Moisture Content Using Time Domain Reflectometry

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