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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Calculation methods for the concentration distribution and pollutant mixingzone in rivers with varia...
Calculation methods for the concentration distribution and pollutant mixingzone in rivers with variant lateral diffusion coefficient
Author : ZHOUHU WU (1), WEN WU (2) & ZHIWEN SONG (3)
ABSTRACT
The range of the pollution mixing zone is a critical factor used in the design of river discharge project and in the water
environmental impact assessment. For point, constant source in straight-bank wide open channel, we mathematically
obtained the analytical solution of the simplified two-dimensional advection-diffusion equation for the pollutant
concentration distribution under variant lateral diffusion coefficient condition. Based on it, the calculation method for
pollutant mixing zone was investigated. Theoretical formulas for the maximum length, maximum width and its
corresponding longitudinal coordinate of the pollutant mixing zone had been deduced, as well as its area and the contour -
curve formulas of its outer boundary. Further discussion had focused on the effects of variant lateral diffusion coefficient
on the morphology of the pollutant mixing zone. It is found that the length-width ratio of the pollutant mixing zone is
proportional to (Pe)1/2. The results of this study can be used as calculation basis of the allowable range or the maximum
pollutant load for riverí»s pollution mixing zone. It is much faster for calculation and is more flexible, convenient to use in
practical engineering cases than using the two-dimensional water quality model.
File Size : 858,399 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 19/08/2015
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