Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model
Apstrakt
Parameters of 1D confluence models are originally defined for concordant beds’ (CB’s) confluences. This paper aims at estimating these parameters for discordant beds’ confluences using numerical simulation results of 3D flow. A 3D finite-volume based model SSIIM2 that was successfully validated in CB’s confluences is applied in this study, too. Confluences with the low, moderate and maximal observed bed elevation discordance ratio values are analysed for three characteristic hydrological scenarios: dominance of the tributary flow, equal contributions of the combining flows and dominance of the main-river flow. It is shown that: 1) the mean flow angle δ approaches junction angle α with the increase in bed elevation discordance, especially when tributary flow dominates, 2) the value of Hager’s correction coefficient σ is not constant and 3) the contribution of the tributary flow to the 1D momentum equation is under predicted when either parameter δ or σ is used for its estimation.
Izvor:
Sustainable Hydraulics in the Era of Global Change - Proceedings of the 4th European Congress of the, 2016, 684-690Izdavač:
- CRC Press/Balkema
Scopus: 2-s2.0-85015044542
Kolekcije
Institucija/grupa
GraFarTY - CONF AU - Đorđević, Dejana AU - Stojnić, Ivan PY - 2016 UR - https://grafar.grf.bg.ac.rs/handle/123456789/747 AB - Parameters of 1D confluence models are originally defined for concordant beds’ (CB’s) confluences. This paper aims at estimating these parameters for discordant beds’ confluences using numerical simulation results of 3D flow. A 3D finite-volume based model SSIIM2 that was successfully validated in CB’s confluences is applied in this study, too. Confluences with the low, moderate and maximal observed bed elevation discordance ratio values are analysed for three characteristic hydrological scenarios: dominance of the tributary flow, equal contributions of the combining flows and dominance of the main-river flow. It is shown that: 1) the mean flow angle δ approaches junction angle α with the increase in bed elevation discordance, especially when tributary flow dominates, 2) the value of Hager’s correction coefficient σ is not constant and 3) the contribution of the tributary flow to the 1D momentum equation is under predicted when either parameter δ or σ is used for its estimation. PB - CRC Press/Balkema C3 - Sustainable Hydraulics in the Era of Global Change - Proceedings of the 4th European Congress of the T1 - Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model EP - 690 SP - 684 UR - https://hdl.handle.net/21.15107/rcub_grafar_747 ER -
@conference{ author = "Đorđević, Dejana and Stojnić, Ivan", year = "2016", abstract = "Parameters of 1D confluence models are originally defined for concordant beds’ (CB’s) confluences. This paper aims at estimating these parameters for discordant beds’ confluences using numerical simulation results of 3D flow. A 3D finite-volume based model SSIIM2 that was successfully validated in CB’s confluences is applied in this study, too. Confluences with the low, moderate and maximal observed bed elevation discordance ratio values are analysed for three characteristic hydrological scenarios: dominance of the tributary flow, equal contributions of the combining flows and dominance of the main-river flow. It is shown that: 1) the mean flow angle δ approaches junction angle α with the increase in bed elevation discordance, especially when tributary flow dominates, 2) the value of Hager’s correction coefficient σ is not constant and 3) the contribution of the tributary flow to the 1D momentum equation is under predicted when either parameter δ or σ is used for its estimation.", publisher = "CRC Press/Balkema", journal = "Sustainable Hydraulics in the Era of Global Change - Proceedings of the 4th European Congress of the", title = "Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model", pages = "690-684", url = "https://hdl.handle.net/21.15107/rcub_grafar_747" }
Đorđević, D.,& Stojnić, I.. (2016). Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model. in Sustainable Hydraulics in the Era of Global Change - Proceedings of the 4th European Congress of the CRC Press/Balkema., 684-690. https://hdl.handle.net/21.15107/rcub_grafar_747
Đorđević D, Stojnić I. Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model. in Sustainable Hydraulics in the Era of Global Change - Proceedings of the 4th European Congress of the. 2016;:684-690. https://hdl.handle.net/21.15107/rcub_grafar_747 .
Đorđević, Dejana, Stojnić, Ivan, "Estimation of 1D-confluence model parameters in right-angled discordant beds’ confluences using 3D numerical model" in Sustainable Hydraulics in the Era of Global Change - Proceedings of the 4th European Congress of the (2016):684-690, https://hdl.handle.net/21.15107/rcub_grafar_747 .