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2 Acta Geophysica

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Scenarios of the spread of a waste heat discharge in a river — Vistula River case study

Kalinowska M.B., Rowiński P.M., Kubrak J., Mirosław-Świątek D.

Acta Geophysica

2012

Vol. 60, no. 1

214-231

The problem of two-dimensional mathematical modelling of heated cooling water discharges into running waters is considered in the paper. Two models — one for the evaluation of 2D turbulent velocity field and the other, developed by authors of the study, for 2D heat transport in open-channels — were used in the calculations. Relevant scenarios of the spread of heated water discharged from a designed gas-stem power plant to be constructed at the Vistula River were presented. Environmentally most friendly variant of the discharge of the thermal pollution was selected from among four various variants.

Truncation errors of selected finite-difference methods for two-dimensional advection-diffusion equation with mixed derivatives

Kalinowska M.B., Rowiński P.M.

Acta Geophysica

2007

Vol. 55, no. 1

107-118

The spread of a passive contaminant in an open-channel reach is considered with use of a two-dimensional advection-diffusion equation with the included offdiagonal dispersion coefficients. This paper presents the calculation of truncation errors, namely numerical diffusion and numerical dispersion for various finite difference schemes. The accuracy of the considered finite-difference approximations is analysed by deriving and studying the relevant modified partial differential equation.