Open channel junctions are encountered in urban water treatment plants, irrigation
and drainage canals, and natural river systems. Junctions are very
important in municipal sewerage systems and river engineering. Adequate
theoretical description of flow through an open channel junction is difficult
because numerous variables are to be considered. Equations of junction models
are based on mass and momentum or mass and energy conservation. The
objective of this study is to compare two junction models for subcritical flows.
In channel branches, we solve numerically the Saint-Venant hyperbolic system
by combining Preissmann scheme and double sweep method. We validate
our results with HEC-RAS using Nash and Sutcliffe efficiency. In junction
models, equality of water stage and complete energy conservation equation
from HEC-RAS are compared. Outcome of the research clearly indicates that
the complete conservation energy model is more suitable in flow through
junction than equality of water stage model in serious situations.
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