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J. Jpn. Soc. Soil Phys.
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No. +*+, p. ++ +0 ,**/

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Solute Transport Properties of Soil Measured with a Vertically-Installed Time
Domain Reﬂectometry Probe
Kosuke NOBORIO*, Ieyasu TOKUMOTO** and Yoshiaki MUKAIDA****, *** Faculty of Agriculture, Iwate University, Morioka *,*ῌ2//*, Japan** United Graduate School, Iwate University, Morioka *,*ῌ2//*, Japan* Present address : School of Agriculture, Meiji University, Kawasaki ,+.ῌ2/1+, Japan
Abstract
It is crucial to know transport properties of solute in soil when contaminants are spilled into
soil. In +33*’s a procedure using a vertically-installed time domain reﬂectometry (TDR) probe
was developed to estimate solute transport properties for the input of the Dirac delta function.
We proposed a procedure for a step function input, equivalent to a contaminant breakthrough incase of a broken barrier at a ﬁnal deposal site.

With soil column experiments with sand, relative

concentrations measured with TDR and e%uent were analyzed to estimate the retardation factor,
R, and the di#usion coe$cient, D.

For the step function input, R and D values estimated with

TDR agreed well with those from e%uent.
with TDR agreed with that from e%uent.

For the Dirac-delta function, the R value estimated

The proposed procedure using a vertical TDR probe tomeasure solute properties of soil was validated under the step function input.
Key words : break through curve (BTC), electrical conductivity, di#usion coe$cient, retardation
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Elrick, D.E., Kachanoski, R.G., Pingle, E.A. and Ward,
A.L. (+33,) : Parameter estimates of ﬁeld solutetransport models based on time domain reﬂectometry measurements. Soil Sci. Soc. Am. J., /0 :+00-ῑ+000j_kῌ ¡lm +33, : TDR>78n^

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Or, D., Jones, S.B., VanShaar, J.R., Humphries, S. andKoberstein, L. (,**.) : WinTDR Users guide. Ver.
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  B"8)*+,  (Rhodes, J.D. and Oster, J.D. (+320) : Solute content. In

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A. Klute (ed.) Methods of soil analysis. Part +. ,ndDIX:;ed. Agron. Monogr. 3. pp. 32/ῑ+**0. American So->rP D st R ,C

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ciety of Agronomy and Soil Science Society ofAmerica, Madison, WI, U.S.A.

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Skaggs, T.H. and Leij, F. J. (,**,) : Solute transport :van Genuchten, M. Th., and Wierenga, P. (+320) : So-

Theoretical background. In W.A. Dick and G.C.

lute dispersion coe$cients and retardation fac-

Topp (ed.) Methods of soil analysis. Part .. Phys-

tors. In A. Klute (ed.) Methods of soil analysis.

ical methods. SSSA Book Ser. No. /. pp. +-/-ῌ

Part +. ,nd ed. Agron. Monogr. 3. pp. +*,/ῌ+*/..

+-2*. Soil Science Society of America, Madison,

American Society of Agronomy and Soil Science

WI, U.S.A.

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