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Abstract

This study presents numerical simulations of fecal coliforms dynamics in Luruaco Lake, located in Atlántico Department, Colombia. The velocity field is obtained through a two-dimensional horizontal (2DH) model of Navier-Stokes equations system. The transport equation of fecal coliforms concentration is provided from a convective-diffusive-reactive equation. The lake's geometry is built through cubic spline and multiblock methods. The discretization method by Finite Differences and the First Order Upwind (FOU) are applied to the 2DH model. The Mark and Cell (MAC) method is used to determine numerically the velocity field of water flow. Numerical simulations are carried out for a 72-h period to understand the influence of fecal coliforms injections from each tributary. From the quantitative analysis of the factors that influence fecal coliforms dynamics, proposals are presented, which aims to reduce contamination of the Luruaco Lake. The numerical simulations show that the best option to improve the water quality of Luruaco Lake is the implementation of two actions, the diversion of the Limón stream to the Negro stream and the installation of a sewage treatment plant at the mouth of the Negro stream. Other less expensive proposals are also presented.

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Proposals for Sewage Management at Luruaco Lake,Colombia

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