Comparison of Average Energy Slope Estimation Formulas for One-dimensional Steady Gradually Varied Flow - Publikacja - MOST Wiedzy

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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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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach recenzowanych i innych wydawnictwach ciągłych
Opublikowano w:
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 21 razy

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