Numerical Simulation of Mixing in Natural Rivers

by Terrence O. Harden, (A.M.ASCE), Stearns and Wheeler, Cazenovia, N.Y.; formerly, Grad. Student, Dept. of Civ. and Environmental Engrg., Clarkson Coll. of Tech., Potsdam, N.Y.,
Hung Tao Shen, (M.ASCE), Asst. Prof.; Dept. of Civ. and Environmental Engrg., Clarkson Coll. of Tech., Potsdam, N.Y.,


Serial Information: Journal of the Hydraulics Division, 1979, Vol. 105, Issue 4, Pg. 393-408


Document Type: Journal Paper

Abstract: A numerical model is developed for two-dimensional transient mixing in natural river channels. Through the use of an orthogonal curvilinear coordinate system based on the geometry and the flow distribution of the river channel, the physical domain is mapped into a rectangular strip by introducing the cumulative discharge as the new transverse coordinate. The concentration values at each point in the grid system are then determined at time levels by using a combined implicit/explicit finite difference successive scheme. A computer program is developed to solve these equations, and a case study is presented and verified with an existing steady-state analytical solution and field measurement.

Subject Headings: Numerical models | Two-dimensional models | Flow distribution | Case studies | Field tests | Hydraulic models | Hydrologic models | Transient response

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