EFFECTIVENESS OF TRAPEZOIDAL AND SINUSOIDAL SUBMERGEDWAVE BREAKERS IN REDUCING WAVE AMPLITUDE
Submerged breakwater is one of breakwater type that is commonly used as a coast protector from wave hit. Various forms of submerged breakwaters have been developed such as trapezoidal and sinusoidal shapes. In this final project, the effectiveness of submerged breakwaters with these forms will be...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/38207 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Submerged breakwater is one of breakwater type that is commonly used as a
coast protector from wave hit. Various forms of submerged breakwaters have
been developed such as trapezoidal and sinusoidal shapes. In this final project, the
effectiveness of submerged breakwaters with these forms will be discussed through
mathematical modeling and numerical simulation. The effectiveness of submerged
breakwaters can be seen from the transmission coefficient (Kt), which is the ratio
of the amplitude of the wave that has passed through the breakwater (transmission
amplitude) to the amplitude of the wave coming from the sea (amplitude comes).
Shallow water equation will be used as main model in this final project. The
equation will be solved analytically to get the transmission coefficient of each
submerged breakwater form. We solve the model numerically using the finite
volume method on staggered grid. Furthermore, wave propagation phenomena will
be assessed when the dimensions of submerged breakwaters with certain forms are
varied. From the validation of numerical simulation with analytical solution, we
got that the Kt error is small enough. For the trapezoidal submerged breakwaters,
the most effective form of reducing wave amplitude is when the sloping side is
increasingly steep towards upright. In general, the value of Kt from sinusoidal
wave breakers is smaller than other forms because it allows resonance Bragg, which
is resonance which causes large reflection waves. This resonance occurs when the
incoming wavelength is twice that of the wavelength of the submerged breakwater.
The numerical simulation results are then validated with physical experiment data,
and it is found that the Kt value error is quite small. This means that the numerical
simulation performed can describe the wave propagation phenomenon well. |
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