
J. Jpn. Soc. Soil Phys.
+
No. +*+, p. ,1 -/ ,**/



 *ῌ**ῌ*Development of Automated Suction Controlled Flux Sampler for
Unsaturated Sandy Soil
Naoko HIGASHI*, Yasushi MORI** and Mitsuhiro INOUE** Arid Land Research Center, Tottori University, +-3* Hamasaka, Tottori 02*ῌ***+, Japan** Faculty of Life and Environmental Science, Shimane University,+*0* Nishikawatsu, Matsue 03*ῌ2/*., Japan
Abstract
A sandy ﬁeld has the potential hazard of nitrate contamination because of its low fertilizer
holding capacity. A suction controlled ﬂux sampler (SCFS) consisting of an automated vacuum
system and a sampling ﬁlter device has been developed for accurate measurement of water ﬂux
from the root zone.

Knowing that water content in sandy ﬁeld was highly sensitive to suctionchange, a bu#er container was placed between the pump and a sampling bottle to apply moderate
suction and avoid accidental over-sucking.

A sampling device with a glass ﬁlter was placed in adune sand column and inﬁltration experiments were conducted.

A moderate suction was ac-

hieved and the resulting water-collecting e$ciency was from 3. to +*3῍ under continuous
rainfall. It showed that SCFS collected inﬁltrated water e#ectively without disturbing theinﬁltration streamline.
Key words : dune sand, suction control, unsaturated soil, water-collecting e$ciency.

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SCFS °V±

Schematic of the suction controlled ﬂux sampler (SCFS).

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/¢f 2* cm &1¯&1)ncm 

1/B+

aC

#  -**&(°"vwe)n 
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32

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Fig. .

HYDRUS-,D  )*+,-. /* cm j.
a : SFD E$ A-¡¢+q£¤b : ¥¦§ZjyzZ{{¨¤c : ,* mm h+ ©_ª«VyzZ{{¨¤Results of the calculation by HYDRUS-,D with /* cm constant suction at the ﬁlter.
a : Changes of the matric potential inside and outside of the SFD.
b : Soil water content under free drainage.
c : Soil water content under continuous rainfall with ,* mm h-+)*+,-./01

23

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33

Inﬁltration water sampling by SCFS under continuous rainfall.
a : Matric potential for suction control.
b : Sampling intensity and cumulative amount of sampled water.
c : Suction in the sampling bottle and the bu#er container.

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(+333) : The HYDRUS-,D software package for &' +0 ()/0156*<= -10ῌ-11.

simulating the two-dimensional movement ofInoue, M. and Dirksen, C. (,***) : An Automaticallywater, heat, and multiple solutes in variably-

operated soil water ﬂux meter of improved de-saturated media. Version ,.*. IGWMC-TPS-/-, In-

sign &' +, ()/0156*<= 0-0ῌ

ternational Ground Water Modeling Center, Colorado School of Mines, Golden, Colorado.

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Kosugi, K. and Katsuyama, M. (,**.) : Controlledsuction period lysimeter for measuring verticalwater ﬂux and convective chemical ﬂuxes. Soil
Sci. Soc. Am. J.,02 : -1+ῌ-2,.

1 HYDRUS ,
van Grinsven, J. J.M., Booltink, H.W.G., Dirksen, C.,van Breemen, N., Bongers, N. and Waringa, N.

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