Abstract
A sudden dam failure is usually simulated by the rapid removal of a gate in laboratory tests and numerical simulations. The gate-opening time is often determined according to the Lauber and Hager instantaneous collapse criterion (referred to as the Lauber–Hager criterion), which is established for a rectangular open channel with a dry bed. However, this criterion is not suitable for non-rectangular channels or initial wet-bed conditions. In this study, the effect of the gate-opening time on the wave evolution is investigated by using the large eddy simulation (LES) model. The instantaneous dam-break, namely, a dam-break without a gate, is simulated for comparison. A gate-opening criterion for generating dam-break flow in a non-rectangular wet-bed channel is proposed in this study, which can be used as an extension of the Lauber–Hager criterion and provides a more comprehensive and reasonable estimate of the gate opening time.
Highlights
Dam-break floods usually cause considerable economic and loss of life [1,2,3,4]
Hager [13], a new criterion of gate-opening time is proposed in this study for generating dam-break waves in a non-rectangular channel with downstream wet-bed conditions
This new criterion provides a reasonable determination of the gate-opening time
Summary
Dam-break floods usually cause considerable economic and loss of life [1,2,3,4]. Due to its practical importance and difficulty for obtaining the field data, extensive studies on dam-break floods have been carried out using laboratory experiments, numerical simulation, and theoretical analysis [5,6,7,8,9,10]. Von Häfen et al [21] analyzed the effect of the gate-opening time based on the Lauber–Hager criterion on the dam-break flow in a rectangular dry bed channel. They found that the difference between the dam-break waves generated with and without a gate was significantly large near the dam. The Lauber–Hager criterion only considers the initial upstream water depth; it may not provide a gate opening time satisfying the requirement of instantaneous dam-break for the non-rectangular channels or initial downstream wet-bed. Any test or numerical simulation that requires the use of a gate to simulate an instantaneous collapse process can refer to the standard proposed in this article
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
