On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station
Abstract
The exchange discharge model (EDM) is the model that was developed for the estimation of a stage-discharge curve and flood routing in compound channels. It was thoroughly tested against experimental data in different compound channel layouts. However, there is a little evidence on its application in rivers. This paper studies EDM performance in estimating stage-discharge curve at two gauging stations on the same river with different hydraulic conditions and compares its results with the traditional, divided channel method (DCM). The contribution of momentum fluxes due to turbulence diffusion and mass exchange to the total energy loss are analysed. It is found that EDM parameter values (ψt and ψg) depend on the hydraulic conditions at a gauging station. In the case of M1-type water surface profile, the ψt-value increases and the
effect of mass transfer is negligible. In the case of M2-type profile, the ψt-value decreases and the momentum flux due to mass transfer becomes dominant. None...theless, the lower ψt-value does not result in smaller additional loss due to turbulence diffusion, since the velocity difference between the main channel and the floodplain increases. Although the EDM and DCM provide approximately the same total discharge, EDM gives more realistic discharge distribution (main channel discharge is reduced and that on the floodplain is increased by 30-40% due to mass transfer caused by non-prismaticity of the channel).
Keywords:
Non-prismatic compound channel / momentum flux due to turbulence and mass exchange / energy lossSource:
E-proceedings of the 38th IAHR World Congress, 2019, 2783-2790Publisher:
- Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR-
Funding / projects:
- Monitoring and Modeling of Rivers and Reservoirs (MORE) - Physical, Chemical, Biological and Morphodynamic Parameters (RS-MESTD-Technological Development (TD or TR)-37009)
Note:
- September 1-6, 2019, Panama City, Panama Editor: Lucas Calvo
Collections
Institution/Community
GraFarTY - CONF AU - Đorđević, Dejana AU - Ivković, Marija AU - Stojnić, Ivan PY - 2019 UR - https://grafar.grf.bg.ac.rs/handle/123456789/1851 AB - The exchange discharge model (EDM) is the model that was developed for the estimation of a stage-discharge curve and flood routing in compound channels. It was thoroughly tested against experimental data in different compound channel layouts. However, there is a little evidence on its application in rivers. This paper studies EDM performance in estimating stage-discharge curve at two gauging stations on the same river with different hydraulic conditions and compares its results with the traditional, divided channel method (DCM). The contribution of momentum fluxes due to turbulence diffusion and mass exchange to the total energy loss are analysed. It is found that EDM parameter values (ψt and ψg) depend on the hydraulic conditions at a gauging station. In the case of M1-type water surface profile, the ψt-value increases and the effect of mass transfer is negligible. In the case of M2-type profile, the ψt-value decreases and the momentum flux due to mass transfer becomes dominant. Nonetheless, the lower ψt-value does not result in smaller additional loss due to turbulence diffusion, since the velocity difference between the main channel and the floodplain increases. Although the EDM and DCM provide approximately the same total discharge, EDM gives more realistic discharge distribution (main channel discharge is reduced and that on the floodplain is increased by 30-40% due to mass transfer caused by non-prismaticity of the channel). PB - Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR- C3 - E-proceedings of the 38th IAHR World Congress T1 - On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station EP - 2790 SP - 2783 DO - 10.3850/38WC092019-0815 ER -
@conference{ author = "Đorđević, Dejana and Ivković, Marija and Stojnić, Ivan", year = "2019", abstract = "The exchange discharge model (EDM) is the model that was developed for the estimation of a stage-discharge curve and flood routing in compound channels. It was thoroughly tested against experimental data in different compound channel layouts. However, there is a little evidence on its application in rivers. This paper studies EDM performance in estimating stage-discharge curve at two gauging stations on the same river with different hydraulic conditions and compares its results with the traditional, divided channel method (DCM). The contribution of momentum fluxes due to turbulence diffusion and mass exchange to the total energy loss are analysed. It is found that EDM parameter values (ψt and ψg) depend on the hydraulic conditions at a gauging station. In the case of M1-type water surface profile, the ψt-value increases and the effect of mass transfer is negligible. In the case of M2-type profile, the ψt-value decreases and the momentum flux due to mass transfer becomes dominant. Nonetheless, the lower ψt-value does not result in smaller additional loss due to turbulence diffusion, since the velocity difference between the main channel and the floodplain increases. Although the EDM and DCM provide approximately the same total discharge, EDM gives more realistic discharge distribution (main channel discharge is reduced and that on the floodplain is increased by 30-40% due to mass transfer caused by non-prismaticity of the channel).", publisher = "Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR-", journal = "E-proceedings of the 38th IAHR World Congress", title = "On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station", pages = "2790-2783", doi = "10.3850/38WC092019-0815" }
Đorđević, D., Ivković, M.,& Stojnić, I.. (2019). On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station. in E-proceedings of the 38th IAHR World Congress Pª Bajo Virgen del Puerto, 3 28005 Madrid, Spain: International Association for Hydro-Environment Engineering and Research -IAHR-., 2783-2790. https://doi.org/10.3850/38WC092019-0815
Đorđević D, Ivković M, Stojnić I. On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station. in E-proceedings of the 38th IAHR World Congress. 2019;:2783-2790. doi:10.3850/38WC092019-0815 .
Đorđević, Dejana, Ivković, Marija, Stojnić, Ivan, "On the possibilities of application of exchange discharge model in estimation of a rating curve at a river gauging station" in E-proceedings of the 38th IAHR World Congress (2019):2783-2790, https://doi.org/10.3850/38WC092019-0815 . .