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首页> 外文期刊>Journal of Hydroinformatics >Two-dimensional numerical modeling of chemical transport-transformation in fluvial rivers: formulation of equations and physical interpretation
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Two-dimensional numerical modeling of chemical transport-transformation in fluvial rivers: formulation of equations and physical interpretation

机译：河流河流化学迁移转化的二维数值模拟：方程的表示和物理解释

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Based on previous work on the transport-transformation model of heavy metal pollutants in fluvial rivers, this paper presents the formulation of a two-dimensional model to describe chemical transport-transformation in fluvial rivers by considering basic principles of environmental chemistry, hydraulics and mechanics of sediment transport and recent developments along with three very simplified test cases. The model consists of water flow governing equations, sediment transport governing equations, transport-transformation equation of chemicals and convection-diffusion equations of sorption-desorption kinetics of particulate chemical concentrations on suspended load, bed load and bed sediment. The chemical transport-transformation equation is basically a mass balance equation. It demonstrates how sediment transport affects transport-transformation of chemicals in fluvial rivers. The convection-diffusion equations of sorption-desorption kinetics of chemicals, being an extension of batch reactor experimental results, take both physical transport, i.e. convection and diffusion, and chemical reactions, i.e. sorption-desorption into account. The effects of sediment transport on chemical transport-transformation were clarified through three simple examples. Specifically, the transport-transformation of chemicals in a steady, uniform and equilibrium sediment-laden flow was calculated by applying this model, and results were shown to be rational. Both theoretical analysis and numerical simulation indicated that the transport-transformation of chemicals in sediment-laden flows with a clay-enriched riverbed possesses not only the generality of common tracer pollutants, but also characteristics of transport-transformation induced by sediment motion. Future work will be conducted to present the validation/application of the model with available data.
机译：在先前关于河流河流中重金属污染物迁移转化模型的研究工作的基础上，本文提出了一种二维模型，该模型通过考虑环境化学，水力学和水力学的基本原理来描述河流河流中化学迁移转化的模型。沉积物的运输和最新发展以及三个非常简化的测试案例。该模型由水流控制方程，沉积物迁移控制方程，化学物质的传输-转化方程和悬浮浓度，床负荷和床沉积物上颗粒化学浓度的吸附-解吸动力学的对流扩散方程组成。化学输运-转化方程基本上是质量平衡方程。它展示了沉积物的运输如何影响河流河流中化学物质的运输转化。作为分批反应器实验结果的扩展，化学物质的吸附-解吸动力学的对流-扩散方程式既考虑了物理传递即对流和扩散，也考虑了化学反应即吸附-解吸。通过三个简单的例子阐明了沉积物迁移对化学迁移转化的影响。具体地，通过应用该模型计算了稳定，均匀，平衡的含沙流中化学物质的迁移转化，结果表明是合理的。理论分析和数值模拟均表明，富黏土河床含沙流中化学物质的迁移转化不仅具有常见示踪污染物的普遍性，而且具有泥沙运动引起的迁移转化特征。将进行进一步的工作，以提供可用数据的模型验证/应用。

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