Abstract
If a sluice-gate is lowered just to touch the surface of a stream in an open water channel, instability may set in. A cyclic motion may ensue, in which the surface upstream, after running up the front of the gate, may descend so much that contact is lost. A wave projected forward then causes contact to be resumed and the cycle completed. The conditions necessary for this complicated sequence to occur were examined in two channels. The Froude number, calculated from the mean discharge and the gate opening, was always in the region 0.6-0.75. For a fixed gate opening the allowable ranges of discharge and outlet weir height were small. The existence downstream of a jump or cnoidal wave was essential. For all the observations the values of the dimensionless quantity (period x stream velocity/gate opening), when plotted on a base of Froude number, lay in a narrow band.
Sign-in/Register to access full text options 
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 callMore From: Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
Disclaimer: 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.
