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Comparison of Average Energy Slope Estimation Formulas for One-dimensional Steady Gradually Varied Flow
Abstrakt
To find the steady flow water surface profile, it is possible to use Bernoulli’s equation, which is a discrete form of the differential energy equation. Such an approach requires the average energy slope between cross-sections to be estimated. In the literature, many methods are proposed for estimating the average energy slope in this case, such as the arithmetic mean, resulting in the standard step method, the harmonic mean and the geometric mean. Also hydraulic averaging by means of conveyance is commonly used. In this study, water surface profiles numerically computed using different formulas for expressing the average slope were compared with exact analytical solutions of the differential energy equation. Maximum relative and mean square errors between numerical and analytical solutions were used as measures of the quality of numerical models. Experiments showed that all methods gave solutions useful for practical engineering purposes. For every method, the numerical solution was very close to the analytical one. However, from the numerical viewpoint, the differences between the methods were significant, as the errors differed up to two orders of magnitude.
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- Wersja publikacji
- Accepted albo Published Version
- DOI:
- Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1515/heem-2015-0006
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Informacje szczegółowe
- Kategoria:
- Publikacja w czasopiśmie
- Typ:
- artykuły w czasopismach recenzowanych i innych wydawnictwach ciągłych
- Opublikowano w:
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Archives of Hydro-Engineering and Environmental Mechanics
nr 61,
strony 89 - 109,
ISSN: 1231-3726 - Język:
- angielski
- Rok wydania:
- 2014
- Opis bibliograficzny:
- Artichowicz W., Mikos-Studnicka P.: Comparison of Average Energy Slope Estimation Formulas for One-dimensional Steady Gradually Varied Flow// Archives of Hydro-Engineering and Environmental Mechanics. -Vol. 61., iss. 3–4 (2014), s.89-109
- DOI:
- Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1515/heem-2015-0006
- Weryfikacja:
- Politechnika Gdańska
wyświetlono 126 razy