Resumen:
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Consulta en la Biblioteca ETSI Industriales (8261)
[EN] Recently, there has been a significant progress in various aspects of the wave
attenuation, particularly wave breaking (Banner and Peirson (2007), Drazin et al
(2008)). However, there still remain important aspects ...[+]
[EN] Recently, there has been a significant progress in various aspects of the wave
attenuation, particularly wave breaking (Banner and Peirson (2007), Drazin et al
(2008)). However, there still remain important aspects that are very poorly
understood. A key problem is role of turbulence attenuation and associated of waves.
This is a difficult problem not only theoretically and also experimentally.
In this investigation, a laboratory study has been undertaken to quantify the role of
turbulence in the attenuation of surface waves. There are many ways of generating coexisting
wave and turbulent fields. In this study, we have elected to use rainfall as the
source of turbulence. This was for three reasons:
1. Vertically impinging droplets can not impart horizontal momentum or energy to
the wave field;
2. Rainfall is a source of near surface turbulence and therefore qualitatively
similar to turbulence generated by wind or surface breaking; and,
3. The attenuation of waves by rainfall is of practical interest with regard to wave
dynamics and electromagnetic interaction with open ocean surfaces.
The damping of water waves by rain was mentioned by Reynolds as early as 1875.
More recently the subject has been investigated by different researchers, Manton
(1973), Nystuen (1989), Tsimplist (1992). In all these studies, it was assumed that the
main mechanism for wave damping by rain is the result of turbulent dissipation
induced by rain drops penetrating the free surface of waves.
In this report, we examine quantitatively the process by which rain generated
turbulence and attenuates waves. The results obtained are compared with the results
with other laboratory results reported.
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