A comparison study of one-and two-dimensional hydraulic models for river environments.
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2017-05-01
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Alternative Title:A comparison study of one-and two-dimensional hydraulic models for river environments : appendix.
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Abstract:Computer models are used every day to analyze river systems for a wide variety of reasons vital to
the public interest. For decades most hydraulic engineers have been limited to models that simplify the fluid
mechanics to the unidirectional case. With the advent of higher quality data and greater computational
power, two-dimensional hydrodynamic models have become practical for widespread use. Two such models
are considered in this report: HEC-RAS v.5.0, v.5.0.1, and v.5.0.3, and SRH-2D v.3.0. These twodimensional
models were compared to the most common one-dimensional model (HEC-RAS). While the
latest version of HEC-RAS is capable of both one- and two-dimensional analyses, previous versions were
restricted to one-dimensional flow. Findings in this report include: differences in the flow divisions for
multiple opening bridges for all three models, less subjectivity in the construction of the 2D models than for
the 1D, differences in the sensitivity of each 2D model to the Manning’s roughness coefficient, great
similarity in the expansion and contraction rates at bridges for the 2D models when using the full momentum
equations with HEC-RAS 2D, differences in the response of the two-dimensional models at steady state
conditions to vortex shedding through bridge openings with cylindrical piers, shorter computation times for
HEC-RAS 2D than SRH-2D using highly comparable model setups, and in general, higher depths predicted
by SRH-2D than HEC-RAS 1D but the highest depths overall predicted by the HEC-RAS 2D full
momentum model.
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