Calibrating electromagnetic short soil water sensors

[img]
Preview
PDF
Language: English
9Mb
Title:Calibrating electromagnetic short soil water sensors
Creators:
Loiskandl, Willibald; loiskandl at mail dot boku dot ac dot at; University of Natural Resources and Applied Life Sciences, Institute of Hydraulics and Rural Water Management, Muthgasse 18, A-1190 Vienna, Austria
Buchan, Graeme D.; Soil & Physical Sciences Department, Lincoln University, Canterbury, New Zealand
Sokol, Wolfgang; University of Natural Resources and Applied Life Sciences, Institute of Hydraulics and Rural Water Management, Muthgasse 18, A-1190 Vienna, Austria
Novák, Viliam; Institute of Hydrology, Slovak Academy of Sciences, Račianska 75, 831 02 Bratislava, Slovak Republic
Himmelbauer, Margarita; University of Natural Resources and Applied Life Sciences, Institute of Hydraulics and Rural Water Management, Muthgasse 18, A-1190 Vienna, Austria
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 58, 2, pp. 114-125
Uncontrolled Keywords:Soil Moisture Probes, Electromagnetic Probes, TDR, Calibration

Abstract

The use of electromagnetic (EM) soil moisture probes is proliferating rapidly, in two broad domains: in field and laboratory research; and in strongly practical applications such as irrigation scheduling in farms or horticultural enterprises, and hydrological monitoring. Numerous commercial EM probes are available for measurement of volumetric water content (θv), spanning a range of measurement principles, and of probe dimensions and sensing volumes. However probe calibration (i.e. the relationship of actual θv to probe electrical output) can shift, often substantially, with variations in parameters such as soil texture, organic matter content, wetness range, electrical conductivity and temperature. Hence a single-valued, manufacturer-supplied calibration function is often inadequate, forcing the user to seek an application-specific calibration. The purpose of this paper is to describe systematic procedures which probe users can use to check or re-determine the calibration of their selected probe(s). Given the wide diversity of operating principles and designs of commercially-available EM probes, we illustrate these procedures with results from our own calibrations of five different short probes (length of 5 to 20 cm). Users are strongly recommended to undertake such calibration checks, which provide both a) pre-use experience, and b) more reliable in-use data.

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

Title:Calibrating electromagnetic short soil water sensors
Translated title:Kalibrácia elektromagnetických snímačov vlhkosti pôdy
Creators:
Loiskandl, Willibald; loiskandl at mail dot boku dot ac dot at; University of Natural Resources and Applied Life Sciences, Institute of Hydraulics and Rural Water Management, Muthgasse 18, A-1190 Vienna, Austria
Buchan, Graeme D.; Soil & Physical Sciences Department, Lincoln University, Canterbury, New Zealand
Sokol, Wolfgang; University of Natural Resources and Applied Life Sciences, Institute of Hydraulics and Rural Water Management, Muthgasse 18, A-1190 Vienna, Austria
Novák, Viliam; Institute of Hydrology, Slovak Academy of Sciences, Račianska 75, 831 02 Bratislava, Slovak Republic
Himmelbauer, Margarita; University of Natural Resources and Applied Life Sciences, Institute of Hydraulics and Rural Water Management, Muthgasse 18, A-1190 Vienna, Austria
Uncontrolled Keywords:Soil Moisture Probes, Electromagnetic Probes, TDR, Calibration
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:58
Number:2
Page Range:pp. 114-125
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:6464
Item Type:Article
Deposited On:14 Jan 2011 14:27
Last Modified:14 Jan 2011 13:27

Citation

Loiskandl, Willibald; Buchan, Graeme D.; Sokol, Wolfgang; Novák, Viliam; Himmelbauer, Margarita (2010) Calibrating electromagnetic short soil water sensors. Journal of Hydrology and Hydromechanics, 58 (2). pp. 114-125. ISSN 0042-790X

Repository Staff Only: item control page