A physical modeling of bottom frictional resistance on a hydraulic bore propagating in an open-channel

Hitoshi Miyamoto, Akira Kadota, Kouichi Morimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publication34th IAHR Congress 2011 - Balance and Uncertainty
Subtitle of host publicationWater in a Changing World, Incorporating the 33rd Hydrology and Water Resources Symposium and the 10th Conference on Hydraulics in Water Engineering
PublisherInternational Association for Hydro-Environment Engineering and Research (IAHR)
Pages3651-3658
Number of pages8
ISBN (Electronic)9780858258686
Publication statusPublished - 2011 Jan 1
Externally publishedYes
Event34th 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 - Brisbane, Australia
Duration: 2011 Jun 262011 Jul 1

Publication series

Name34th 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

Conference

Conference34th 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
CountryAustralia
CityBrisbane
Period11/6/2611/7/1

Keywords

  • Bottom friction
  • Hydraulic bore
  • Laboratory experiment
  • Momentum conservation

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Water Science and Technology
  • Environmental Science (miscellaneous)

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