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Journal of Zhejiang University SCIENCE B 2005 Vol.6 No.5 P.338~345


Water and heat transport in hilly red soil of southern China: II. modeling and simulation

Author(s):  LU Jun, HUANG Zhi-zhen, HAN Xiao-fei

Affiliation(s):  School of Environmental Science and Natural Resources, Zhejiang University, Hangzhou 310029, China

Corresponding email(s):   jlu@hzcnc.com

Key Words:  Red soil, Coupled transfer of soil water and heat, Simulation model, Validation, Sensitivity analysis

LU Jun, HUANG Zhi-zhen, HAN Xiao-fei. Water and heat transport in hilly red soil of southern China: II. modeling and simulation[J]. Journal of Zhejiang University Science B, 2005, 6(5): 338~345.

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%A LU Jun
%A HUANG Zhi-zhen
%A HAN Xiao-fei
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T1 - Water and heat transport in hilly red soil of southern China: II. modeling and simulation
A1 - LU Jun
A1 - HUANG Zhi-zhen
A1 - HAN Xiao-fei
J0 - Journal of Zhejiang University Science B
VL - 6
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EP - 345
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Y1 - 2005
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2005.B0338

simulation models of heat and water transport have not been rigorously tested for the red soils of southern China. Based on the theory of nonisothermal water-heat coupled transfer, a simulation model, programmed in Visual Basic 6.0, was developed to predict the coupled transfer of water and heat in hilly red soil. A series of soil column experiments for soil water and heat transfer, including soil columns with closed and evaporating top end, were used to test the simulation model. Results showed that in the closed columns, the temporal and spatial distribution of moisture and heat could be very well predicted by the model, while in the evaporating columns, the simulated soil water contents were somewhat different from the observed ones. In the heat flow equation from Taylor and Lary (1964), the effects of soil water evaporation on the heat flow is not involved, which may be the main reason for the differences between simulated and observed results. The predicted temperatures were not in agreement with the observed one with thermal conductivities calculated by de Vries and Wierenga equations, so that it is suggested that Kh, soil heat conductivity, be multiplied by 8.0 for the first 6.5 h and by 1.2 later on. sensitivity analysis of soil water and heat coefficients showed that the saturated hydraulic conductivity, KS, and the water diffusivity, D(θ), had great effects on soil water transport; the variation of soil porosity led to the difference of soil thermal properties, and accordingly changed temperature redistribution, which would affect water redistribution.

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