Paddle Generated Waves in Laboratory Channels
- 1 February 1980
- journal article
- Published by American Society of Civil Engineers (ASCE) in Journal of the Waterway, Port, Coastal and Ocean Division
- Vol. 106 (1) , 79-97
- https://doi.org/10.1061/jwpcdx.0000193
Abstract
The wave field generated by single frequency and biharmonic motion of a plane paddle wavemaker is investigated theoretically and in laboratory experiments. Regardless of the detailed paddle geometry, nonlinear effects associated with the paddle boundary conditions introduce free waves which are the order of forced nonlinear corrections (Stokes type) associated with nonlinearities of the surface boundary conditions. For simple harmonic paddle motion at frequency σ, the largest free waves have frequency 2σ. For biharmonic paddle motions of frequencies σ1 and σ2, additional free difference frequency (—σ1—σ2—) long waves are generated. These can resonate in a closed basin, leading to undesired modulations of breaker location and other shallow water phenomenon.Keywords
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