Effects of Contaminant Decay on the Diffusion Centre of a River |
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Authors: | P Mebine R Smith |
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Institution: | (1) Department of Mathematical Sciences, Loughborough University, LE11 3TU, U.K |
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Abstract: | Many contaminants exhibit decay (radioactive decay, consumed by bacteria, heat loss or evaporation through the surface, dissolution
by turbulence). For a non-symmetric river with non-reversing flow, the effects of decay are allowed for in specifying the
diffusion centre, i.e. the optimal position for a steady discharge. Three families of exact solutions are presented that illustrate
the effect on the diffusion centre of cross-channel variation in the decay (uniform, decreasing or increasing with depth).
The diffusion centre is shifted to deeper or to shallower water accordingly as the temporal decay divided by flow speed decreases
or increases with water depth. |
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Keywords: | contaminant decay diffusion centre environmental impact pollutant modes variability of decay |
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