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Soil water flux density measurements near 1 cm d-1 using an improved heat pulse probe design
Year:
2010
Source of publication :
Water Resources Research
Authors :
Kamai, Tamir
;
.
Volume :
46
Co-Authors:
Kamai, T., Department of Land, Air and Water Resources, University of California, 123 Veihmeyer Hall, Davis, CA 95616, United States
Tuli, A., Department of Land, Air and Water Resources, University of California, 123 Veihmeyer Hall, Davis, CA 95616, United States
Kluitenberg, G.J., Department of Agronomy, Kansas State University, 2004 Throckmorton Hall, Manhattan, KS 66506, United States
Hopmans, J.W., Department of Land, Air and Water Resources, University of California, 123 Veihmeyer Hall, Davis, CA 95616, United States
Facilitators :
From page:
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(
Total pages:
1
)
Abstract:
The heat pulse probe (HPP) technique has been successfully applied for estimating water flux density (WFD). Estimates of WFD have been limited to values greater than 10 cm d, except for two recent studies with lower detection limits of 2.4 and 5.6 cm d-1. Although satisfactory for saturated soils, it is recognized that current HPP capabilities are limited for applications in the vadose zone, where WFD values are generally below 1 cm d-1. Since numerical sensitivity analysis has shown that large heater needle diameters may increase HPP capabilities in the lower flux density range, a HPP with a 4-mm-diameter heater needle was developed and tested. WFD values were obtained by fitting temperature data to the analytical solution for a pulsed cylindrical heat source of infinite length. Effective heater-thermistor distance and soil thermal diffusivity values were determined for specific heat input scenarios with zero WFD, prior to imposing water flow across the HPP needles. We showed excellent results in the range of 1-10 cm d-1 and satisfactory results in the range of 10-1000 cm d-1. Copyright 2008 by the American Geophysical Union.
Note:
Related Files :
Cylindrical heat source
diffusivity
Heat pulse
Needles
pumps
soil moisture
vadose zone
water flow
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DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
19725
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:31
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Scientific Publication
Soil water flux density measurements near 1 cm d-1 using an improved heat pulse probe design
46
Kamai, T., Department of Land, Air and Water Resources, University of California, 123 Veihmeyer Hall, Davis, CA 95616, United States
Tuli, A., Department of Land, Air and Water Resources, University of California, 123 Veihmeyer Hall, Davis, CA 95616, United States
Kluitenberg, G.J., Department of Agronomy, Kansas State University, 2004 Throckmorton Hall, Manhattan, KS 66506, United States
Hopmans, J.W., Department of Land, Air and Water Resources, University of California, 123 Veihmeyer Hall, Davis, CA 95616, United States
Soil water flux density measurements near 1 cm d-1 using an improved heat pulse probe design
The heat pulse probe (HPP) technique has been successfully applied for estimating water flux density (WFD). Estimates of WFD have been limited to values greater than 10 cm d, except for two recent studies with lower detection limits of 2.4 and 5.6 cm d-1. Although satisfactory for saturated soils, it is recognized that current HPP capabilities are limited for applications in the vadose zone, where WFD values are generally below 1 cm d-1. Since numerical sensitivity analysis has shown that large heater needle diameters may increase HPP capabilities in the lower flux density range, a HPP with a 4-mm-diameter heater needle was developed and tested. WFD values were obtained by fitting temperature data to the analytical solution for a pulsed cylindrical heat source of infinite length. Effective heater-thermistor distance and soil thermal diffusivity values were determined for specific heat input scenarios with zero WFD, prior to imposing water flow across the HPP needles. We showed excellent results in the range of 1-10 cm d-1 and satisfactory results in the range of 10-1000 cm d-1. Copyright 2008 by the American Geophysical Union.
Scientific Publication
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