
J. Jpn. Soc. Soil Phys.
I
No. +*/, p. /3 0/ ,**1

*ῌ**ῌ

***Thermal Conductivity of Washed Tottori Dune Sandwith Rape Seed Oil and ModelingHidetoshi MOCHIZUKI*, Makoto KOIWASAKI** and Takeshi SUKO**** Arid Land Research Center, Tottori University, +-3* Hamasaka, Tottori 02*ῌ***+, Japan** Graduate School of Agriculture, Tottori University, Koyama-cho .ῌ+*+, Tottori 02*ῌ2//-, Japan*** National Institute of Advanced Industrial Science and Technology, Research Center for
Deep Geological Environment, +ῌ+ῌ+ Higashi, Tsukuba, Ibaraki -*/ῌ2/01, Japan
Abstract
Soil pollution with oil is a serious environmental problem. Although the oil movement in soil
must be recognized, the thermal properties of oil-polluted soil, which are required for simulation,
were less studied.

In this report, we focused on thermal conductivity of the oil-polluted soil.

The objectives of this study were to clarify the e#ects of liquid phase ratio, temperature andwater-oil ratio on the thermal conductivity of oil-polluted soil. Washed Tottori dune sand andrape seed oil were used as experimental samples.

The thermal conductivity of samples wasmeasured by KD, under several experimental conditions of the liquid phase ratio, temperature
and water-oil ratio. The thermal conductivity of oil-polluted soil increased with the liquid phaseratio, even when the soil samples contained both of oil and water, and showed di#erent trends
according to the liquid phase ratio and water-oil ratio when the temperature increased.

It wassuggested that the thermal conductivity of soil polluted with organic oil might show the opposite
trend to that of the non-polluted soil by increase in temperature.

When the liquid phase ratio

and temperature were ﬁxed, the thermal conductivity of oil-polluted soil decreased linearly to thewater-oil ratio. Finally, we proposed an empirical formula to predict the thermal conductivity ofoil-polluted soil which contains water and oil by using the liquid phase ratio, water-oil ratio, andthermal conductivities of soil non-polluted and polluted with only oil.
Key words : Oil-polluted soil, Thermal conductivity, E#ect of liquid phase ratio, E#ect of wateroil ratio, E#ect of temperature+    :;<=>?@AB CDῌEFGHI?@A6J%K. L#$MN2 789OPQ ῌ !"RSTUVW+,#$XY>Z* 

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?FGU*01 v>w xS'S.
@$01$

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@]APA(2q|Y)(}~

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Physical properties of water and rape
seed oilC6 Mg m-?FG W m+ K+

4332*
43+*ῌ43,****

4/3,**
4+0****** ,*· ¸ ,**+ ** +1· ¸ ,**+
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QR¨Up V %water bridge %liquid- -+ island( : R¨5S' ^W R¨U©

XYZ' ª«¬"¬ Sakaguchi et al.

 / ,* .*Z pq r2t uv-sῌ+ %W m4+ K4+( wv-%m- m4-( L x#<T<-yz:;{|}A1ῌ+r2 -£- DJKL t D Pc 8C@9A 9 efg/ KD hohL?o D 9A CE T#:GDUX  YS: 3 A OPQR
ST<P- / +* ,* -* .*Z  / ([?oA `6'P@6 ^AB@ACG/ ,* .*Z %±K( pq

,**1( ' p7 K  AoL'[@9A\]'r2x#<T<-yz:;{|}A1~ t h 3/῍ 4V 5@³+**῍ - ´  µ¶9A ·_@³Fig. ++`6 V­L®¯$°'  %NO +32,( D²^*῍ -^´E#ect of liquid phase ratio on thermal conductivity of oil-polluted sand ofvarious water-oil ratios at /, ,* and .*Z from left.

Error bars mean 3/῍ signiﬁcant level by t-test. The water-oil ratios of * and +**῍ mean that soil
contains only water and oil respectively.

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 *.*2 *.+0 *.,. m- m6- 789:;

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5

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uv

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water-oil ratios at *.*2, *.+0, and *.,. m- m- in liquid phase ratio from left.

Error bars mean 3/ῌ signiﬁcant level by t-test. The water-oil ratios of * and +**ῌ mean that soil
contains only water and oil respectively.

 : ©ª«-- 

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 )RMSE* / *.*0 Wm+ K+ 3Y

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G<U- P

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\   "#<& !
ῌ-,* 
12

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3/῍ ¶·¸¹  *῍ /;e +**῍ /e Aº»G<¼¹Fig. -E#ect of oil fraction on thermal conductivity of oil-polluted sand of various liquid phase ratios at ,*.

Error bars mean 3/῍ signiﬁcant level by t-test. The water-oil
ratios of * and +**῍ mean that soil contains only water and oil
respectively.

OE%@f 

!O>

¡ A@NH93- ¢ m<*.*2 *.+0 *.,. m- m- >& *.*. *.*0 *.*1 Wm+K+ <NJ  !O *.0+ *.2* *.3+Wm+ K+ <&,< LMN/NHY-.    £¤¥¦§¨§<©ª«%&  < 012 !ῌ="# ¬TG<$V64

Y +*/ ¼ g,**1h

 *.+0 m- m-RS  >< *.,. m- m- DQ

RS #$ 2?7T 'A2B
?<56" U #VG$ WX
!" %7"
'.=  ῎ P< &#!"Y( PZ&$
:   R!" ' 64S)   ?!" #[\ *]4' *^4 3&$" > 3&$+,< G!"#  [\   _῏<`  ῐῌ.

 W) Eq. g+h7")+¶Comparison between measured thermal conductivity and estimated thermal conductivity by Eq. (+) of oil-polluted sand.

7
+m

ab&!"cdef Eq. g+h

RMSE ·¸/m/X¹º» gRoot Mean Squared Percent Errorh
6"

Fig. .

 $"'ῐ + ' -i< #cde .jk'[\ gnl./ /m *.11 W

+K h

<` RMSE  *.*0W m+ K+ O&῏῎

The RMSE means the Root Mean Squared Error.

.jkR0 /X +0 1 gnh2o 3pqpr
stuX v ##w< xy 4<N!
ῌ: m-   

Hiraiwa, Y. and Kasubuchi, T. (,***) : Temperature   

deendence of thermal conductivity of soil over a!" #$ # %

!"#&$"'   '  '()* +, -#!#.
/0123&$ 4"56"
῍  ῌ ῒ ῑ ῍ *.*2ῐ*.,. m-:

 <


Journal of Soil Science, /+ : ,++ῐ,+2.

56{|}rjkq g,**-h : *~}r p. +3,ῐ+3/ 7}8b9n :7  89:;

 *.*2 m- m-  ' 

wide range of temperature (/ῐ1/z). European;<= g+32,h :!"jk 2o}rjk> B -- : +ῐ/..
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