Wave reflection from submerged rectangular obstacles: experiments and predictive formula

Iran Lima Neto

Resumo


This paper presents an experimental study on wave reflection from submerged rectangular objects (shelves) in a 2-D laboratory flume. Preliminary tests using resistive wire probes and an acoustic Doppler anemometer were first conducted to confirm that a piston-type wavemaker was able to produce sinusoidal waves in the channel, without significant reflection from the boundaries. Then, measurements of water surface displacements using the two-fixed probe method and considering the presence of submerged rectangular obstacles provided reflection coefficients for different wave parameters and submergence conditions. Dimensional analysis was conducted and a dimensionless relationship was obtained to describe the reflection coefficient as a function of the wave slope and the water-to-shelf depth ratio. This relationship can be potentially used to predict ocean wave reflection from submerged obstacles for similar conditions as those evaluated in the present study.

 


Palavras-chave


dimensional analysis; laboratory flume; submerged obstacles; wave reflection.

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DOI: http://dx.doi.org/10.4025/actascitechnol.v40i1.37520



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ISSN 1806-2563 (impresso) e ISSN 1807-8664 (on-line) e-mail: actatech@uem.br

  

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