Summary
The in-situ performance of heat flux plates within coarse porous substrates might be limited due to poor contact between plate and substrate. We tested this behaviour with a simple laboratory set-up. Two test substrates were placed above a reference material of known thermal conductivity between a warm and a cold plate to establish a vertical heat flux. The temperature gradients and the response of a soil heat flux plate were measured. By means of the Fourier law of heat conduction the thermal conductivity of each test substrate was calculated, thus incorporating all heat transfer within the volume and representing the “effective” conductivity. The laboratory method had an accuracy of up to ±7% (±13% for a smaller set-up). In comparison, heat flux plate-derived heat fluxes showed errors of up to 26%. Use of heat flux plates in coarse substrates is not recommended without additional measurements.
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References
DOW (2003) The DOW Chemical company: Roofmate SL-A technical description. www.dow.com/styrofoam/europe/at/proddata/aupdro03.htm (May 2004)
M Fuchs A Hadas (1973) ArticleTitleAnalysis of the performance of an improved soil heat flux transducer Soil Sci Soc Am Proc 37 173–175 Occurrence Handle10.2136/sssaj1973.03615995003700020009x
A Graf W Kuttler J Werner (2004) ArticleTitleDewfall measurements on Lanzarote, Canary Islands Meteorol Z 13 405–412 Occurrence Handle10.1127/0941-2948/2004/0013-0405
BG Heusinkveld AFG Jacobs AAM Holtslag SM Berkowicz (2004) ArticleTitleSurface energy balance closure in an arid region: role of soil heat flux Agric Forest Meteorol 122 21–37 Occurrence Handle10.1016/j.agrformet.2003.09.005
DR Lide (Eds) (1996) Handbook of chemistry and physics CRC Press Boca Raton
CL Mayocchi KL Bristow (1995) ArticleTitleSoil surface heat flux: some general questions and comments on measurements Agric Forest Meteorol 75 43–50 Occurrence Handle10.1016/0168-1923(94)02198-S
OV Mogensen (1970) ArticleTitleThe calibration factor in heat flux meters in relation to the thermal conductivity of the surrounding medium Agric Forest Meteorol 7 401–410
JR Philip (1961) ArticleTitleThe theory of heat flux meters J Geophys Res 66 571–579 Occurrence Handle10.1029/JZ066i002p00571
TJ Sauer DW Meek TE Ochsner AR Harris R Horton (2003) ArticleTitleErrors in heat flux measurement by flux plates of contrasting design and thermal conductivity Vadose Zone J 2 580–588 Occurrence Handle10.2113/2.4.580
JR Taylor (1982) An introduction to error analysis University Science Books Mill Valley 270
SJ van Donk EW Tollner (2000) ArticleTitleApparent thermal conductivity of mulch materials exposed to forced convection Trans ASAE 43 1117–1127
van Haneghem IA (1981) A non-stationary needle method (thermal conductivity, heat capacity, thermal resistance), WAU Dissertation No. 875, Wageningen University, Netherlands (in Dutch)
WKP van Loon HMH Bastings EJ Moors (1998) ArticleTitleCalibration of soil heat flux sensors Agric Forest Meteorol 92 1–8 Occurrence Handle10.1016/S0168-1923(98)00090-2
S Weber (2006) ArticleTitleComparison of in-situ measured ground heat fluxes within a heterogeneous urban ballast layer Theor Appl Climatol 83 169–179 Occurrence Handle10.1007/s00704-005-0137-0
S Weber W Kuttler (2005) ArticleTitleSurface energy-balance characteristics of a heterogeneous urban ballast facet Clim Res 28 257–266
E Zmarsly W Kuttler H Pethe (2002) Meteorologisch-klimatologisches Grundwissen Stuttgart Ulmer 176
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Weber, S., Graf, A. & Heusinkveld, B. Accuracy of soil heat flux plate measurements in coarse substrates – Field measurements versus a laboratory test. Theor. Appl. Climatol. 89, 109–114 (2007). https://doi.org/10.1007/s00704-006-0256-2
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DOI: https://doi.org/10.1007/s00704-006-0256-2