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J. Jpn. Soc. Soil Phys.
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*Soil Temperature Change and Heat of Wetting during
Inﬁltration into Dry soils
Takeo AKAE*, Aya TANAKA** and Munehide ISHIGURO** The Graduate School of Environmental Science, Okayama University,-ῌ+ῌ+ Tsushima-Naka, Okayama, Japan** Okayama Prefecture Association of Land Improvement Project Promotion,+ῌ-ῌ1 Uchisange, Okayama, Japan
Abstract
In inﬁltratioin process of water to dry soils, rise of the temperature just before the wetting front
arrival is observed.

This phenomenon is caused by wetting heat released by adsorption of water

vapor onto the soil and or wetting of the soil. The temperature change a#ects not only soil water
potential, inﬁltration itself due to change in viscosity of the water but also bio-chemical phenomena
by changing temperature environment. However, few quantitative experiments and analytic
studies have been made on this phenomena of natural soils, many problems remain to be solvedon this matter. In this research, to evaluate the soil temperature change quantitatively, inﬁltration experiment was conducted on three types of natural soils under thermally insulated condition and the temperature change was monitored. In addition, wetting heat of the soils was measured by calorimetric method. The experimental results showed that the temperature increased
at just before the wetting front by ,.yellow soil, respectively.

, ,+.0and /.2

for the Masa soil, Ando soil and the red

We observed strong relationship between the increases in the temper-

ature and the wetting heats of each soil. The wetting heats of each soil showed strong relationship with the cation exchange capacity.
Key words : Inﬁltration, Heat of wetting, Speciﬁc surface, Adiabatic inﬁltration experiment, Cation exchange capacity+      

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Soil Sci., ++- : -+-῍-+0.

 !"#$%&'( )* +Iwata, S., Tabuchi, T. and Warkentin, B.P (+322) : Soil-,-./01 23&45$6%&7'-water interaction Machanism and application,

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Clays and Clay Minerals, ,2 : ,*.῍,+*.

Anderson, D.M. and Linville, A. (+30,) : Temperature

Kijne, J.W. (+303) : On the interaction of water mole-

ﬂuctuations at a wetting front : I. Characteristic

cules and Montmorilonite surfaces, Soil Sci. Soc.,

temperature-time curves, Soil Sci. Soc. Am. J., ,0 :Amer. Proc., -- : /-3῍/.-.

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Anderson, D.M. and Linville, A. (+30-) : Temperatureﬂuctuations at a wetting front : II. The e#ect of u+311v : (7' 5B(
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nitude of the temperature ﬂuctuations, Soil Sci.

por movement during inﬁltration into dry soils,

Soc. Am. J., ,1 : -01῍-03.

Soil Sci., +,. (,) : 1-῍10.

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