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运用数值模拟的方法,对明沟排水洗盐过程中土壤水盐运移动态进行了研究。在沟距一半处土壤水盐运移可近似视为一维运动,冲洗脱盐率与脱盐深度最小,并沿这一位置形成对称分布;整个冲洗过程中,含盐量的变化总是稍滞后于含水率的变化;分析冲洗后不同含盐量剖面的返盐率发现,返盐率与含盐量符合幂函数关系,含盐量较低时,返盐率较高,反之亦然;运用数值模拟方法,建立了区域不同含盐量情况下明沟排水洗盐沟距一半处的洗盐制度。
The numerical simulation method was used to study the dynamic changes of soil water and salt transport during the process of salt water drainage in Ming ditch drainage. The movement of soil water and salt in the half of the furrow distance can be regarded as one-dimensional movement, the rate of desalination and the depth of desalination are the smallest, and form a symmetrical distribution along this location. During the whole process of washing, the change of salt content is always slightly behind The results showed that the rate of return to salt and the content of salt were in accordance with the power function. When the salt content was low, the rate of return to salt was high, and vice versa. Simulation method, the establishment of the region under different salt content in the next ditch ditch washing salt water from halfway salt washing system.