Tributary Pollutant Effects in the Urban Stream Network

by S. J. Ahn, Chung Buk Natl Univ, Cheong Ju, Republic of Korea,
G. H. Kim, Chung Buk Natl Univ, Cheong Ju, Republic of Korea,
G. W. Choi, Chung Buk Natl Univ, Cheong Ju, Republic of Korea,



Document Type: Proceeding Paper

Part of: Irrigation and Drainage

Abstract: With considering unsteady flow and backwater effects, a linear water quality model is developed based on the finite difference approximation. The model is composed to two components which are hydraulic and mass transport components. The hydraulic component in the model consists of two partial differential equations describing the conservations of mass and momentum in the interior channel cross section and two equations describing the conservations of mass and energy at channel junctions. The mass transport component in the model is composed of two mass transport equations which are applied in the interior channel cross section and channel junctions. This model uses a simultaneous solution algorithm for stream network. This algorithm takes advantage of the banded matrix features to compute the coefficient matrix. This algorithm has the advantages of significantly reduced computer storage requirement and computational time requirement. To show tributary pollutant effects a hypothetical stream network having mild channel bed slopes was applied to the model. The simulation results show that simultaneous water quality model can predict more reliable results rather than the sequential models.

Subject Headings: Water quality | Water pollution | Hydrologic models | Hydraulic models | Mathematical models | Water supply | Mass transport | Algorithms

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