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为进一步认识微咸水的入渗规律,采用室内土柱入渗试验,对比分析了不同矿化度(0,1,3,5g/L)的NaCl溶液加入湿润剂进行灌溉后盐碱土累积入渗量和入渗率随时间的变化,验证了在盐碱土中微咸水加湿润剂情况下不同公式描述入渗过程的适应性,并分析了全盐量和氯离子的剖面分布。结果表明:NaCl溶液添加湿润剂灌溉后,盐碱土的入渗能力随NaCl溶液矿化度的增加呈先增加后减小的趋势,入渗能力在NaCl溶液矿化度为3g/L时达到最大,超过3g/L后随NaCl溶液矿化度的增大而减小。湿润土层剖面含盐量及Cl-浓度在相同湿润锋随NaCl溶液矿化度的增加而增大,在湿润锋前达到最大。NaCl溶液矿化度为3g/L时,剖面含水率最大,其次是5,1,0g/L。4种不同矿化度NaCl溶液添加湿润剂条件下,Kostiakov公式的入渗率拟合值和实测值最为接近。
In order to further understand the infiltration law of brackish water, indoor soil column infiltration test was adopted to analyze the effects of saline solution with different salinity (0, 1, 3, 5g / L) The permeability and infiltration rate changes with time. The adaptability of different formulas to describe the infiltration process in the case of brackish water and wetting agent in saline-alkali soil is verified. The profile distribution of total salt and chloride ions is also analyzed. The results showed that the infiltration capacity of saline-alkali earth first increased and then decreased with the increase of salinity of NaCl solution after infiltration of NaCl solution with wetting agent. The infiltration capacity reached the maximum when the salinity of NaCl solution was 3g / L , More than 3g / L with NaCl solution salinity increase decreases. The salt content and Cl- concentration in wet soil profile increase with the increase of salinity of NaCl solution in the same wetting front and reach the maximum before wetting front. When the salinity of NaCl solution is 3g / L, the water cut of the profile is the largest, followed by 5,1,0g / L. Kostiakov’s infiltration rate fitting value and the measured value are the closest under the conditions of adding humectants to 4 different salinities of NaCl solution.