Study of flow and dispersion of pollutants in the Igap\'o I Lake

TL;DR

This study develops a mathematical model combining hydrodynamics and reactive transport to analyze water quality and pollution dispersion in Igapó I Lake through numerical simulations.

Contribution

It introduces a coupled 2D hydrodynamic and reactive-transport model specifically for Igapó I Lake, integrating Navier-Stokes and QUAL2E models for comprehensive analysis.

Findings

Insights into oxygen deficit and pollutant load dynamics

Quantitative understanding of carbon-nitrogen cycle effects

Enhanced understanding of lake hydrology and water quality

Abstract

This work proposes a mathematical model on the water quality for Igap\'o I Lake, located in Londrina, Paran\'a. A qualitative analysis on the pollution of the lake is carried out through numerical simulations which provide informations for the understanding of the processes involved. For the hydrodynamic flow of the lake, a horizontal two-dimensional model is considered. The hydrodynamic velocity field is simulated by the Navier-Stokes and pressure equations, supposing an incompressible newtonian fluid. This hydrodynamic velocity field is inserted in the reactive-transport model. The reactive part of this model considers only the carbon-nitrogen cycle, described by the QUAL2E model. A qualitative and quantitative analysis of the numerical simulations conducted in function of the deficit of dissolved oxygen, of the biochemical oxygen demand and of the load of pollutants provided a better understanding of the hydrology and of the water quality in the Igap\'o I Lake.