Journal
JOURNAL OF HYDRAULIC RESEARCH
Volume 59, Issue 2, Pages 214-223Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00221686.2020.1744753
Keywords
Analytical modelling; channel junction; dam-break flow; laboratory experiments; tributary
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Funding
- National Science Foundation Office of International Science and Engineering [OISE0730246]
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The study found that the initial lake height and initial velocity in the main channel influence the surge wave characteristics. The ratio between the Reynolds number in the lake and in the main channel can be used to predict time to peak and peak flow rate.
For a channel with a constant discharge, the characteristics of the surge wave entering a junction are obtained from the classical Stoker solution, and then the effect of the junction is analysed by applying the momentum and mass conservation equations. Experimental cases involving different combinations of the tributary lake height and the main channel discharge were tested, and measurements show good agreement with the theoretical solution. The experiments showed that the initial lake height and initial velocity in the main channel influence the surge wave characteristics. The ratio between the Reynolds number in the lake and in the main channel can be used to predict time to peak and peak flow rate. Furthermore, power-law relations for surge wave height and velocity downstream of the junction were developed from the analytical solution.
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