非饱和土中镉离子传输模型参数反演

使用自行设计的的真空实验装置,采用一维实验室土柱实验方法在不同实验条件下进行了15组实验,并基于实验所得的穿透曲线,使用梯度正则化方法反演得到了镉离子在8种葡萄牙土样和1种比利时土样中相应的传输模型参数。同时通过数值模拟实验验证了梯度正则化方法的有效性和可靠性,进而证明所得结果是有效的。

Model parameter inversion for cadmium ion transport through unsaturated soils

The procedure of cadmium ion transport through unsaturated soils can be described by the convection-diffusion equation, coupled with non-equilibrium sorption effect. The undetermined model parameters in the dimensionless governing equation include the longitudinal dispersivity, the sorption distribution coefficient, the precipitating rate, the dissolving rate and the maximum precipitation. This paper aims at inversing parameter values of the parameter mentioned above for cadmium ion transport in 8 Portugal soils samples and 1 Belgium soils sample under different experimental conditions. Experimental results of 15 groups are obtained in virtue of the laboratory soil column tests for 9 soils samples mentioned above by using self-designed experimental apparatus under different experimental condition. The gradient regularization method is adopted as the inversion method. Based on the experimental results (BTCs), the corresponding model parameters for each experiment are identified by the numerical inversion. The validity and reliability of the gradient regularization method is verified by the numerical simulated experimental results. The computational results confirm the veracity of results presented in this paper.