科研之友
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摘要
The excessive increase of salt in soil is considered as a major contemporary threat. Among the significant causes of this phenomenon are evaporated and/or transpired irrigation water, which contribute directly to the accumulation of salt ions in the soil. To tackle this salient problem many methods have been advocated. The first tends to eliminate salts by combining the leaching requirement method together with artificial drainage. However, it has proven to be inadequate. The second, a recent and novel one, aims at capturing and removing salt from the soil surface. This process is referred at as the dry drainage method. This work is a numerical simulation of the simultaneous water solute and heat transfer in an unsaturated porous medium during the simultaneous evaporation and drainage of saline dry land soils. A detailed mathematical model is formulated to describe the non-isothermal transport of water in unsaturated porous media. The model consists of the coupled conservative equations of mass, liquid phase, gas phase, water vapor, species, and energy. The water transport mechanisms dealt with are the liquid-phase advection and diffusion of vapor in the gas phase. The numerical results show the remarkable variation profiles of water evaporation and the distribution of soil solution and solute during desalination by dry drainage relative to previous models. In fact, the use of the stick system favors the evaporation intensity and the solute accumulates far from the soil surface layer.
- 出版日期2012
