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本文基于质量守恒原理,推导出了一种计算水动力弥散系数的方法。对四种不同水流及初始盐分浓度条件下的弥散系数计算给出了具体公式和试验方法。通过稳定蒸发试验求出了卫河粉砂土的水动力弥散系数。利用该参数和数值模拟对相同土壤在水平吸湿条件下的盐分运动试验结果做了模拟对比,吻合较好,表明所求参数反映了土壤的物理特性。
Based on the principle of conservation of mass, a method to calculate the hydrodynamic dispersion coefficient is derived. Specific formulas and test methods are given for the calculation of the dispersion coefficient under four different water flows and initial salt concentration. The hydrodynamic dispersion coefficient of Weihe silt sand was obtained through the steady evaporation test. Using this parameter and numerical simulation, the results of simulated salt movement under the condition of horizontal moisture absorption are compared and simulated. The result shows that the parameters are in good agreement with the physical characteristics of soil.