The application of accurate transport models is critical in tracer routing through river reaches. Reactive models are widely used because of reaction and degradation properties of some pollutants with bed and bank materials and cell-based theoretical models are among the most popular for contaminant transport simulation. This study investigates the reactive form of cells in a series model. A new analytical equation is proposed that includes a degradation term for sudden mass release in a river reach. To consider the inaccuracy of previously proposed equations, we attempted to rearrange separate transport actions such as advection, dispersion and degradation through the cells of a length unit. The cell residence times of mixed cells were equated, and the degradation action was only forced to the second cell. The parameter number of the solution was lower than in previously proposed models. Synthetic datasets of the advection–dispersion–degradation equation were used to examine model performance. The model was found to work well in the first and later units. The numerical convolution method was used in the second to fourth units, and it also fitted synthetic data. The previously proposed equation of reactive HCISD was imprecise in the convolution method.

准确的运输模型的应用对于通过河段的示踪物路由至关重要。由于某些污染物会与床和堤岸材料发生反应和降解，因此反应模型得到了广泛使用，基于细胞的理论模型在污染物迁移模拟中最为流行。这项研究调查了串联模型中细胞的反应形式。提出了一个新的分析方程，其中包括一个降解项，用于河段中突然的大量释放。为了考虑先前提出的方程式的不准确性，我们尝试通过长度单位的单元重新排列单独的传输动作，例如对流，分散和降解。使混合细胞的细胞停留时间相等，并且仅将降解作用强加于第二个细胞。该解决方案的参数编号低于以前提出的模型。对流-弥散-退化方程的综合数据集被用来检验模型的性能。发现该模型在第一个和以后的单元中运行良好。在第二到第四单元中使用了数值卷积方法，并且它也拟合了合成数据。在卷积方法中，先前提出的反应式HCISD方程不精确。