Predicting the transport of atrazine in soils: Second-order and multireaction approaches
Predicting the transport of atrazine in soils: Second-order and multireaction approaches
复制标题
预测土壤中莠去津的迁移：二阶和多反应方法
DOI：
10.1029/94wr02229
复制
发表时间：
1994
影响因子：
5.4
通讯作者：
H. Selim
中科院分区：
文献类型：
--
作者：
Liwang Ma;H. Selim
作为前一篇论文(Ma和Selim，1994a)的后续，这项研究旨在进一步验证修正的二阶两位点(SOTS)模型，该模型用于描述柱相容实验中的阿特拉津传输。此外，将SOTS模型与Selim(1989)的多反应输运模型(MRTM)的能力进行了比较。这两个模型的必要参数都是从批量实验和氚示踪剂穿透结果中得出的。这些模型仅用于预测不同实验条件下的阿特拉津穿透曲线(BTC)。我们还提出了一种用流体动力学弥散系数D和有效溶质输运长度Le作为拟合参数分析氚BTCs的方法。在两个模型中都使用了氚适配的D和Le，以得出阿特拉津的BTC预测。无论(1)输入浓度C0，(2)土柱长度L，(3)孔隙水速度ν，(4)多次脉冲作用，(5)断流(孵化)，SOTS模型对所有(14)阿特拉津BTC都提供了比MRTM更好的预测。我们得出结论：SOTS模型能够描述阿特拉津滞留和转运的化学非均质性。BTC的预测结果证实了运移参数Le在预测土壤中溶质运移时的可靠性。
As a follow-up to a previous paper (Ma and Selim, 1994a), this study was designed to further validate a modified second-order, two-site (SOTS) model for describing atrazine transport in column miscible experiments. Moreover, the capability of the SOTS model was compared with that of the multireaction transport model (MRTM) of Selim (1989). For both models the necessary parameters were derived from batch experiments and tritium tracer breakthrough results. The models were used solely to predict atrazine breakthrough curves (BTCs) for different experimental conditions. We also proposed an alternative way of analyzing tritium BTCs, where the hydrodynamic dispersion coefficient D and an effective solute transport length Le were used as fitting parameters. Tritium fitted D and Le were used in both models to arrive at atrazine BTC predictions. The SOTS model provided superior predictions over MRTM for all (14) atrazine BTCs regardless of (1) input concentration C0, (2) soil column length L, (3) pore water velocity ν, (4) multiple pulse applications, and (5) flow interruption (incubation). We conclude that the SOTS model was capable of describing chemical heterogeneity of atrazine retention and transport. BTC predictions lend credence to the transport parameter Le in predicting solute transport in soils.