宁夏银北试验区盐渍土壤盐分运移数值模拟

摘要

将宁夏银北试验区夏季的蒸发、降雨、地下水埋深等数据作为求解土壤溶质运移方程的定解条件,同时确定试验区土壤的水动力学参数,结合有限体积数值计算方法对试验区土壤盐分含量在不同土层、不同时期的变化进行了数值模拟.结果表明:通过加密计算网格可有效提高模拟结果与实测值的吻合度;随着时间推移,土壤表层盐分含量逐渐增大、深层盐分含量则逐渐减小,模拟过程中出现了盐分含量恒定区域,该区域随时间的迁移逐渐缩小.%According to boundary conditions which were determined by information as evaporation, rainfall, groundwater tables and so on, and hydrodynamic parameters of soil of the test area,the equation of solute transport in soil was solved by finite volume numerical method. The results show that there is a good agreement between simulated and measured values through increasing number of computational grid. The salt content of top soil is increased over time,while the content of deep soil is gradually reduced.