Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental and numerical investigation of breaking bores in straight and meandering channels with different Froude numbers
This study investigates the propagation characteristics of breaking bore in meandering channels focusing on the effects of Froude number (F) on the breaking bore. The experiments are conducted with different Froude number conditions of F = 3.99 for high F and F = 1.53 for low F in a straight and meandering channel. The experimental results are compared with calculated results by Shallow Water Equation (SWE) model and three-dimensional calculation model. In the low F condition, the oscillation of water level like a soliton fission was observed and it was amplified along both banks in the meandering channel. This was explained using the temporal variation of the transverse water surface gradient calculated by SWE model, that is not related with non-hydrostatic pressure component and vertical distribution of the velocity. The high F condition is characterized by the longitudinal gradient of bore head caused by large energy loss. In the meandering channel, the SWE model overestimated the wave height near the bore front along both banks. This is because the secondary flow in the meandering channel increases the velocity near the bed and the flow resistance compared with low F condition and reduces the wave height.
Experimental and numerical investigation of breaking bores in straight and meandering channels with different Froude numbers
This study investigates the propagation characteristics of breaking bore in meandering channels focusing on the effects of Froude number (F) on the breaking bore. The experiments are conducted with different Froude number conditions of F = 3.99 for high F and F = 1.53 for low F in a straight and meandering channel. The experimental results are compared with calculated results by Shallow Water Equation (SWE) model and three-dimensional calculation model. In the low F condition, the oscillation of water level like a soliton fission was observed and it was amplified along both banks in the meandering channel. This was explained using the temporal variation of the transverse water surface gradient calculated by SWE model, that is not related with non-hydrostatic pressure component and vertical distribution of the velocity. The high F condition is characterized by the longitudinal gradient of bore head caused by large energy loss. In the meandering channel, the SWE model overestimated the wave height near the bore front along both banks. This is because the secondary flow in the meandering channel increases the velocity near the bed and the flow resistance compared with low F condition and reduces the wave height.
Experimental and numerical investigation of breaking bores in straight and meandering channels with different Froude numbers
Kobayashi, Daisuke (Autor:in) / Uchida, Tatsuhiko (Autor:in)
Coastal Engineering Journal ; 64 ; 442-457
03.07.2022
16 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Meandering Tendencies in Straight Alluvial Channels
| ASCE | 2021
Meandering tendencies in straight alluvial channels
| Engineering Index Backfile | 1968
Discharge assessment in meandering and straight compound channels
| Taylor & Francis Verlag | 2013
Hydraulic capacity of meandering channels in straight floodways
Engineering Index Backfile | 1956
Equation of motion in channels for relatively large Froude numbers
| Online Contents | 1993