ESTUDO NUMÉRICO DA DINÂMICA DE DISPERSÃO DE POLUENTES EM RIOS POR DIFUSÃO-CONVECÇÃO
ESTUDO NUMÉRICO DA DINÂMICA DE DISPERSÃO DE POLUENTES EM RIOS POR DIFUSÃO-CONVECÇÃO
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DOI: https://doi.org/10.22533/at.ed.569112531036
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Palavras-chave: Dispersão de poluentes; Difusão-Convecção; Método das linhas
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Keywords: Pollutant dispersion; Convection-Diffusion; Method of Lines
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Abstract: Rivers play a fundamental role in maintaining ecological balance and preserving life on Earth, as they integrate large aquatic reservoirs that sustain rich biodiversity. However, this balance can be compromised by pollutant dispersion, which consists of the natural and random spreading of contaminants due to river flow and the presence of pollution sources in these environments. In this context, modeling emerges as a tool that transforms this physical problem into mathematical formulations, enabling the simulation of the phenomenon and the analysis of different scenarios that may arise from it. Based on this, the present study employed the convection-diffusion equation with a pollution source term to simulate pollutant dispersion in rivers and obtain concentration profiles at different times. To solve the Partial Differential Equation (PDE), the method of lines (MOL) was applied to achieve a numerical solution, and convergence analysis was performed to ensure the model’s accuracy and reliability. Additionally, the source term was modeled as the only contributor to pollutant introduction in the system; therefore, the problem was classified as isolated, represented by Neumann boundary conditions. Using the numerical techniques employed in the model, graphs were obtained to demonstrate concentration profiles at different times (t) in seconds, in order to evaluate how the pollutant spreads along the studied river and how the constant values of the diffusive and convective terms affect it. Furthermore, convergence analysis was carried out to verify how mesh refinement is influenced by the increase in the number of points (Nx). It was observed that, beyond a certain Nx value, the concentration curves overlapped, indicating a stable numerical solution, thereby ensuring the precision and accuracy of the model. Therefore, the proposed model enabled the simulation of pollutant dispersion in the river, allowing for a better understanding of environmental impacts and serving as a tool to support remediation strategies.
- João Victor Tovany Soares da Silva
- Matheus Bastos do Carmo
- Waldecléia Queiroz da Costa
- Miguel Fernando Saraiva Maia
- Ana Paula Souza de Sousa
- Haianny Beatriz Saraiva Lima
- Diego Cardoso Estumano