TY - GEN
T1 - A physical modeling of bottom frictional resistance on a hydraulic bore propagating in an open-channel
AU - Miyamoto, Hitoshi
AU - Kadota, Akira
AU - Morimoto, Kouichi
N1 - Funding Information:
We are grateful to Drs K. Michioku and I. Fujita, and the members of JSCE (the Japan Society of Civil Engineers) investigation team of the Toga River water disaster in 2008 for their thoughtful comments and discussion. We thank the Japan Ministry of Land, Infrastructure, Transport and Tourism, the Hyogo Prefectural Government Office, the Kobe City Office for their cooperation on data collection. The partial support from the Foundation of River & Watershed Environment Management (Research Grants No.20-1251-1) is gratefully acknowledged.
Publisher Copyright:
© 34th IAHR Congress 2011. All rights reserved.
PY - 2011
Y1 - 2011
N2 - In this study, we analytically and experimentally investigated propagation characteristics of a hydraulic bore in a rough bed open-channel, and attempted to model the bed friction effect. Momentum conservation was used to derive an equation for the propagation velocity, in which both the frictional and gravitational forces were taken into account. A laboratory experiment was carried out to develop a bottom friction law applied to the bore propagation. The friction coefficient was obtained as an extension from that for a steady-state open-channel flow, and was set to be a function of the channel slope and the water level difference around the bore head. As the water level difference decreased and/or the slope increased, the coefficient became small and converged to the steady-state value in the limit. The results obtained in this paper indicated that the bottom friction effect was one of the important components to describe the bore propagation in an open-channel with a rough bed.
AB - In this study, we analytically and experimentally investigated propagation characteristics of a hydraulic bore in a rough bed open-channel, and attempted to model the bed friction effect. Momentum conservation was used to derive an equation for the propagation velocity, in which both the frictional and gravitational forces were taken into account. A laboratory experiment was carried out to develop a bottom friction law applied to the bore propagation. The friction coefficient was obtained as an extension from that for a steady-state open-channel flow, and was set to be a function of the channel slope and the water level difference around the bore head. As the water level difference decreased and/or the slope increased, the coefficient became small and converged to the steady-state value in the limit. The results obtained in this paper indicated that the bottom friction effect was one of the important components to describe the bore propagation in an open-channel with a rough bed.
KW - Bottom friction
KW - Hydraulic bore
KW - Laboratory experiment
KW - Momentum conservation
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M3 - Conference contribution
AN - SCOPUS:85066152293
T3 - 34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering
SP - 3651
EP - 3658
BT - 34th IAHR Congress 2011 - Balance and Uncertainty
PB - International Association for Hydro-Environment Engineering and Research (IAHR)
T2 - 34th IAHR Congress 2011 - Balance and Uncertainty: Water in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering
Y2 - 26 June 2011 through 1 July 2011
ER -