An automated microinfiltrometer to measure small-scale soil water infiltration properties

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Title:An automated microinfiltrometer to measure small-scale soil water infiltration properties
Creators:
Gordon, Dennis C.; The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, United Kingdom.
Hallett, Paul D.; paul dot hallett at abdn dot ac dot uk; The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, United Kingdom.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 62, 3, pp. 248-252
Uncontrolled Keywords:tension infiltrometer, water sorptivity, automated measurements, small-scale infiltration measurements

Abstract

We developed an automated miniature constant-head tension infiltrometer that measures very small infiltration rates at millimetre resolution with minimal demands on the operator. The infiltrometer is made of 2.9 mm internal radius glass tube, with an integrated bubbling tower to maintain constant negative head and a porous mesh tip to avoid air-entry. In the bubbling tower, bubble formation and release changes the electrical resistance between two electrodes at the air-inlet. Tests were conducted on repacked sieved sands, sandy loam soil and clay loam soil, packed to a soil bulk density ρd of 1200 kg m–3 or 1400 kg m–3 and tested either air-dried or at a water potential ψ of –50 kPa. The change in water volume in the infiltrometer had a linear relationship with the number of bubbles, allowing bubble rate to be converted to infiltration rate. Sorptivity measured with the infiltrometer was similar between replicates and showed expected differences from soil texture and ρd, varying from 0.15 ± 0.01 (s.e.) mm s–1/2 for 1400 kg m–3 clay loam at ψ = –50 kPa to 0.65 ± 0.06 mm s–1/2 for 1200 kg m–3 air dry sandy loam soil. An array of infiltrometers is currently being developed so many measurements can be taken simultaneously.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:An automated microinfiltrometer to measure small-scale soil water infiltration properties
Translated title:An automated microinfiltrometer to measure small-scale soil water infiltration properties
Creators:
Gordon, Dennis C.; The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, United Kingdom.
Hallett, Paul D.; paul dot hallett at abdn dot ac dot uk; The James Hutton Institute, Invergowrie, Dundee, DD2 5DA, United Kingdom.
Uncontrolled Keywords:tension infiltrometer, water sorptivity, automated measurements, small-scale infiltration measurements
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:62
Number:3
Page Range:pp. 248-252
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8290
Item Type:Article
Deposited On:01 Oct 2014 13:27
Last Modified:01 Oct 2014 11:27

Citation

Gordon, Dennis C.; Hallett, Paul D. (2014) An automated microinfiltrometer to measure small-scale soil water infiltration properties. Journal of Hydrology and Hydromechanics, 62 (3). pp. 248-252. ISSN 0042-790X

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