Abstract:The distribution of salt and water and the parameters of infiltration model under the condition of oxygenated brackish water were investigated, and micro-nanobubble rapid generation device was used to carry out different oxygenated levels treatment to brackish water. The results showed that under the condition of different dissolved oxygen infiltration in brackish water, when the infiltration time was the same, the cumulative infiltration and the wetting front depth were increased first and then decreased with the dissolved oxygen amount, and when the dissolved oxygen content of brackish water was 14.0mg/L, the cumulative infiltration and the depth of wet front were maximum. Compared with other treatments, infiltration conditions with dissolved oxygen content of 14.0mg/L in brackish water could accelerate water infiltration and increase soil moisture content. In addition, compared with the treatment without the addition of oxygen, infiltration of different oxygen levels could improve the desalination efficiency of irrigation water. The fitting effect of algebraic model was better than that of PHILIP model under the condition of oxygenated brackish water. In the PHILIP model, with the increase of dissolved oxygen in brackish water, the permeation rate was increased first and then decreased, and the maximum appeared at 14.0mg/L. In the algebraic model, the comprehensive shape factor showed the opposite law, and the minimum value appeared at 14.0mg/L, the algebraic model was able to fit the soil moisture content under one-dimensional vertical infiltration conditions of oxygenated brackish water.
