Abstract
A unified approach has been presented for the computation of concentration distributions in streams. Starting from the Cartesian-coordinates equation governing mass transport in a stream of constant width, the equation describing mass transport in a stream of variable width can be obtained using transformed coordinates. For these coordinates the solution domain is rectangular. Due to the mathematical similarity between the two equations, a common numerical discretization procedure can be employed. The procedure is based on the use of the control volume approach and the power-law interpolation scheme between nodes. The resulting computer program was used for computation of the transverse mixing coefficient in a riverine reach.
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