Parameter estimation of soil hydraulic and thermal property functions for unsaturated porous media using the HYDRUS-2D code

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Title:Parameter estimation of soil hydraulic and thermal property functions for unsaturated porous media using the HYDRUS-2D code
Creators:
Nakhaei, Mohammad; nakhaei at khu dot ac dot ir; Faculty of Geological Sciences, Kharazmi University, No.49, Mofateh Ave., Tehran, Iran. Tel.: +1-951-750-3157
Šimůnek, Jiří; Jiri dot Simunek at ucr dot edu; Department of Environmental Sciences, University of California, Riverside, USA.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 62, 1, pp. 7-15
Uncontrolled Keywords:infiltration, heat transport, parameter estimation, Richards' equation, HYDRUS-2D

Abstract

Knowledge of soil hydraulic and thermal properties is essential for studies involving the combined effects of soil temperature and water input on water flow and redistribution processes under field conditions. The objective of this study was to estimate the parameters characterizing these properties from a transient water flow and heat transport field experiment. Real-time sensors built by the authors were used to monitor soil temperatures at depths of 40, 80, 120, and 160 cm during a 10-hour long ring infiltration experiment. Water temperatures and cumulative infiltration from a single infiltration ring were monitored simultaneously. The soil hydraulic parameters (the saturated water content θ s, empirical shape parameters α and n, and the saturated hydraulic conductivity Ks) and soil thermal conductivity parameters (coeffi-cients b1, b2, and b3 in the thermal conductivity function) were estimated from cumulative infiltration and temperature measurements by inversely solving a two-dimensional water flow and heat transport using HYDRUS-2D. Three scenari-os with a different, sequentially decreasing number of optimized parameters were considered. In scenario 1, seven pa-rameters (θ s, Ks, α, n, b1, b2, and b3) were included in the inverse problem. The results indicated that this scenario does not provide a unique solution. In scenario 2, six parameters (Ks, α, n, b1, b2, and b3) were included in the inverse problem. The results showed that this scenario also results in a non-unique solution. Only scenario 3, in which five parameters (α, n, b1, b2, and b3) were included in the inverse problem, provided a unique solution. The simulated soil temperatures and cumulative infiltration during the ring infiltration experiment compared reasonably well with their corresponding ob-served values.

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

Title:Parameter estimation of soil hydraulic and thermal property functions for unsaturated porous media using the HYDRUS-2D code
Translated title:Parameter estimation of soil hydraulic and thermal property functions for unsaturated porous media using the HYDRUS-2D code
Creators:
Nakhaei, Mohammad; nakhaei at khu dot ac dot ir; Faculty of Geological Sciences, Kharazmi University, No.49, Mofateh Ave., Tehran, Iran. Tel.: +1-951-750-3157
Šimůnek, Jiří; Jiri dot Simunek at ucr dot edu; Department of Environmental Sciences, University of California, Riverside, USA.
Uncontrolled Keywords:infiltration, heat transport, parameter estimation, Richards' equation, HYDRUS-2D
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:1
Page Range:pp. 7-15
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:8181
Item Type:Article
Deposited On:05 Jun 2014 18:30
Last Modified:05 Jun 2014 16:30

Citation

Nakhaei, Mohammad; Šimůnek, Jiří (2014) Parameter estimation of soil hydraulic and thermal property functions for unsaturated porous media using the HYDRUS-2D code. Journal of Hydrology and Hydromechanics, 62 (1). pp. 7-15. ISSN 0042-790X

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