科研之友
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摘要
We aim at deriving the apparent unsaturated conductivity (AUC) K ((ap)), defined as the ratio between the mean flux and the mean head gradient in a stratified vadose zone above the water table. This is achieved for steady flow generated by a constant infiltrating flux applied at the soil surface. By adopting the first-order approximation in the two parameters of the conductivity curve, and under a few additional simplifying assumptions, we were able to analytically compute K ((ap)). It is shown that this latter varies between K ((ap)) a parts per thousand K (H) (the harmonic mean) at the water table, and K ((ap)) a parts per thousand K (ef) (the effective conductivity in gravitational flow) far above the water table. Profiles of the AUC are illustrated, and the impact of parameters values is discussed.
- 出版日期2012-1
