Particle-tracking Method Applied To
Transport Problems In Water Bodies
Author(s)
F. C. B. Mascarenhas & A. E. Trento
Abstract
In this work a particle-tracking model was implemented and applied to simulate
the instantaneous injection of a dye tracer in the Setubal Lagoon, Santa Fe,
Argentina. It focused on the study of the water quality problem generated in
point sources of contaminated water through a rainfall drainage system. This
problem is difficult to treat with the so-called Eulerian methods. The
interpolation for the field velocity, the number of particles used in the
simulations, the representation of boundary conditions and the mesh size for the
calculation of concentrations are discussed. A field experiment using tracers is
described in order to compare the numerical results and the simulations with real
data. The diffusion coefficients calculated from the experiment and the
hydrodynamic modelling give the necessary inputs for the simulations using the
particle-tracking modelling of the measured four clouds. The results support the
main advantages of this method in terms of strict mass conservation, good
representation of high concentration gradients and point sources and as a
consequence, a good representation of the maximum concentration and the
general form of the clouds.
Keywords: particle-tracking, Lagrangian, dispersion, Setubal.
1 Introduction
Point sources in water quality problems, like rainfall runoff outlets, are difficult
to represent in the so-called Eulerian methods, and the particle-tracking method
may represent a good alternative for solving this kind of transport problems. In a
pioneer work Chorin [1] employed the particle-tracking method, solving the
Navier-Stokes equations, for determining the vorticity field of the two-
Keywords
particle-tracking, Lagrangian, dispersion, Setubal.
Related Book
Other papers in this volume
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