Flow-induced gate vibrations: Prevention of sef-excitation computation of dynamic gate behaviour and the use of models

The objective of this study is to develop design criteria for the dynamic behaviour of gates and valves. To this end, a resume of existing theories is given as well as an extended analysis of the added water mass, hydrodynamic rigidity and damping (also negative damping or self-excitation) and excitation by turbulent flow. New computation...

Some considerations about scales for coastal models with movable bed

Starting from the increase of the bed shear of a uniform flow due to wave motion, a tranport formula for waves and current has been derived. With this transport formula scale relations have been drived for models in which material transport, under combined influence of waves and current has to be reproduced.