Presentation of a New Method in Mathematical Modeling of Pollutant Transport in Rivers with Storage Zones

Document Type : Research Article


1 Msc. Graduate of Water Structures, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran,

2 Professor, Department of Water Structures, Faculty of Agriculture, Tarbiat Modares University,Tehran, Iran


Prediction of pollutants transport in water resources is of particular importance in the management and prevention of their pollution. The heterogeneity and non-uniformity in the morphology throughout rivers which is known as the storage area, will make changes in the uniform transport of pollutants to downstream. Storage areas along rivers are actually places around the river where flow velocity in these places is significantly slower than the river’s flow velocity and are also known as dead zones. The presence of these places in rivers makes it difficult to apply the classic pollutant transport equation for them. For a more accurate simulation of the pollutant transport in natural rivers containing storage zones, some improvements should be made to the classic advection-dispersion equation. In this study, a new approach is presented by considering nonlinear flux dispersion and applying storage zones. In order for verification and validation of the proposed model, two series of hypothetical and real data examples have been used. Based on the measured results, the model outputs have acceptable adaptation with observational data and show that the proposed model is an accurate and acceptable model in the simulation of dissolved pollutant transport in rivers with storage zones. According to the obtained concentration-time curves, it can be concluded that the proposed model can model any type of storage area with any amount of area. Also, this model is applicable for all rivers with and without storage area and it is more superior in comparison with other similar models in terms of the number of parameters (considering merely one parameter) and simplicity in physical interpretation; and can be an appropriate alternative instead of the classic pollutant transport model in these type of rivers.


Main Subjects

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