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A hybrid computer method for the analysis of time dependent river pollution problems

This paper is devoted to the description of work done in the hybrid computer simulation of polluted rivers and estuaries. Our attention in this paper is restricted to the solution of the pollutant concentration equation. The computer method used to perform the integration is essentially a continuous-space discrete-time method of lines. We have, in a previous paper, described a continuous-space-discrete-time computer method for the analysis of flows and velocities in a one-dimensional river or estuary. Hence, these two programs, which may be exercised simultaneously, must be viewed as part of the same problem, since the pollutant diffusion parameters in a river (as described in the present paper) may be derived as explicit functions of the river geometry and water flow.