Implicit Numerical Modeling of Unsteady Flows

by Michael Amein, (M.ASCE), Prof.; Dept. of Civ. Engr., North Carolina State Univ., Raleigh, N.C.,
Hsiao-Ling Chu, (A.M.ASCE), Asst. Prof.; Dept. of Civ. Engrg., California State Univ., Long Beach, Calif.; formerly, Research Assoc., Dept. of Civ. Engrg., North Carolina State Univ., Raleigh, N.C.,

Serial Information: Journal of the Hydraulics Division, 1975, Vol. 101, Issue 6, Pg. 717-731

Document Type: Journal Paper


A numerical model based on the equations of unsteady flow in open channels is used to compute unsteady flows in rivers and reservoirs. The cross sections of the waterways range from uniform to highly irregular, the type of flow ranges from slowly varied to abrupt changes in discharge, and nearly all combinations of boundary conditions are encountered. The model uses an implicit finite difference method. The versatility, accuracy, stability, and efficiency of the method is demonstrated by field measurements.

Subject Headings: Open channel flow | Numerical models | River flow | Unsteady flow | Flow measurement | Computer models | Hydraulic models | Hydrologic models

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