ORIGINAL RESEARCH
Comparison of Analytical and Numerical Solutions
for Steady, Gradually Varied Open-Channel Flow
Jacek Kurnatowski
Department of Hydroengineering, West Pomeranian University of Technology,
Piastów 50a, 70-311 Szczecin, Poland
Piastów 50a, 70-311 Szczecin, Poland
Pol. J. Environ. Stud. 2011;20(4):925–930
KEYWORDS
ABSTRACT
The depths for a steady, gradually varied flow in a rectangular open channel with infinite width obtained
analytically by the Bresse formula and numerically using trapezoidal rule for integration have been compared.
It has been shown that numerical integration may generate significant errors of flow values for looped river
networks. The method for choosing the optimum integration step that minimizes numerical integration errors
has been presented.
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