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Friction-term response to boundary-condition type in flow models

Journal of Hydraulic Engineering

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Abstract

The friction-slope term in the unsteady open-channel flow equations is examined using two numerical models based on different formulations of the governing equations and employing different solution methods. The purposes of the study are to analyze, evaluate, and demonstrate the behavior of the term in a set of controlled numerical experiments using varied types and combinations of boundary conditions. Results of numerical experiments illustrate that a given model can respond inconsistently for the identical resistance-coefficient value under different types and combinations of boundary conditions. Findings also demonstrate that two models employing different dependent variables and solution methods can respond similarly for the identical resistance-coefficient value under similar types and combinations of boundary conditions. Discussion of qualitative considerations and quantitative experimental results provides insight into the proper treatment, evaluation, and significance of the friction-slope term, thereby offering practical guidelines for model implementation and calibration.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Friction-term response to boundary-condition type in flow models
Series title:
Journal of Hydraulic Engineering
Volume
122
Issue:
2
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Hydraulic Engineering
First page:
73
Last page:
81
Number of Pages:
9