Modelling rate-limited dissolution in freezing porous media

被引:0
作者
Jyrkama, MI [1 ]
Sykes, JF [1 ]
机构
[1] Univ Waterloo, Dept Civil Engn, Waterloo, ON N2L 3G1, Canada
来源
COMPUTATIONAL METHODS IN WATER RESOURCES, VOLS 1 AND 2: COMPUTATIONAL METHODS FOR SUBSURFACE FLOW AND TRANSPORT - COMPUTATIONAL METHODS, SURFACE WATER SYSTEMS AND HYDROLOGY | 2000年
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D O I
暂无
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
The depletion of residual NAPL sources near the ground surface is highly influenced by seasonal temperature variations and ice formation. The highly variable groundwater velocity field, resulting from freezing and melting ice, may cause mass transfer to become rate limiting. A two-dimensional multiphase contaminant and heat transport finite element model was modified to include rate-limited dissolution formulations. The ice related processes of permeability reduction, freezing point depression, and solute exclusion were included to account for the effects of subzero temperatures. Simulation results indicate that variable temperature has a very significant impact on the transport and fate of contaminants in variably saturated porous media. In addition, the non-equilibrium dissolution rate coefficients are very sensitive to ice related permeability reduction and freezing point depression. Although the mass transfer rates are significantly affected by the rate-limited dissolution correlations, the resultant impact on contaminant transport is marginal due to interphase partitioning.
引用
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页码:123 / 128
页数:6
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