Numerical Modeling of Salinity Transport in a Shallow Well-Mixed Tidal Reach

by G. S. Reddy, Indian Inst of Technology, Kharagpur, India,
S. N. Ghosh, Indian Inst of Technology, Kharagpur, India,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

This paper is concerned primarily with the development of numerical salinity transport model using 8-point implicit finite difference scheme for predicting the salinity variation in a comparatively long and narrow well-mixed tidal reach. The formulation of the model is based on the one dimensional unsteady flow equations of continuity, momentum and salinity transport equation. The finite difference linear algebraic form of the governing equations have been solved through development of a suitable software package coded as STM (Salinity Transport Model) capable of dealing with irregular non-uniform cross sections and roughness variation in a coupled manner using double sweep algorithm. For calibration of the model a suitable reach of River Hoogly has been selected for which published information is available with appropriate input of initial and boundary conditions. The results of the tests have been found to be satisfactory.

Subject Headings: Salinity | Numerical models | Tides | Salt water intrusion | Salt water | Mathematical models | Algorithms

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