Author(s): L. K. Ghosh; C. B. Singh
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Keywords: No Keywords
Abstract: In a highlypollutant laden tidal river, where the velocities areextremely small and water moves siowly like a slug, it is extremely difficult to assess the dispersion when the Eulerian method of computation (fixed grid system) is used as then umerical diffusion may be an order of magnitude higher than the actual diffusion. in sucha situation, the Lagrangian computational method (moving grid system) as proposed by’Fisher (1979) is preferred which compietely avoids numerical diffusion. Basedon"the Eulerian method which is widely used, the flow dynamics in the river have been simulated with the help of one dimensional hydrodynamic model. A linearised four point implict model (1D) as proposed by verwey (1971) has been used for the hydrodynamic studies. As the channel bifurcates and rejoins, a network system model has been used. The effects of 'the improvement of channel on the flow characteristics, such as water level fluctuations and discharges at several sections along the river have been obtained with the help of 1D hydrodynamic model. usingthese flow characteristics as input data, the Lagrangian transport model has been used to study the impact of the channel improvement on pollutant transport capacity.
Year: 1991