Chapter III
Numerical Modeling
45
In the marina area, the protection provided by Cape Matifou and the bathymetry result in waves
reaching the base of the structure with a height of approximately 2.49 m, with a shoaling
coefficient of about 0.43. This indicates that the waves have lost more than half of their intensity.
On the port side, since Cape Matifou does not offer any protection to the area and the waves
from this direction attack the port obliquely, the wave heights on the jetties are higher compared
to those observed in the marina, reaching approximately 4.68 m with a shoaling coefficient of
about 0.48. This means that the waves have only lost 20% of their initial energy.
It is observed that all waves arrive at the base of the structure from the North direction in the
marina and from the North-Northeast direction in the port. This observation can be explained by
the presence of orthogonal lines perpendicular to the isobaths.
Regarding the currents in the area, the winds and waves from the North-Northeast direction
generate East-West currents along the coast with an average speed of about 0.35 m/s. These
observations lead us to conclude that the current patterns in the area are not significantly
influenced by variations in wave height and period offshore.
30-Year Return Period
The results obtained for the 30-year return period are presented in Table III-7 and Figure III-8.
The analysis reveals that the Bay waves offshore retain over 92% of their initial height of 6.61 m
at the model boundaries.
Once the waves enter the bay, their hydrodynamic characteristics, including height and initial
power of 220 KW/m, gradually decrease due to friction with the seabed. This friction slows
down the wave's progression and alters its path through diffraction and refraction when
encountering obstacles, resulting in a progressive dissipation of its energy.
Concerning the Marina, the combined protection offered by Cape Matifou and the bathymetry
leads to waves reaching the base of the structure with a height of approximately 2.50 m and a
shoaling coefficient of around 0.38. This indicates a significant reduction of 63% in wave
intensity.
On the other hand, the Port area lacks the protective effect of Cape Matifou, causing waves
approaching from this direction to strike the port obliquely. As a result, the wave heights
observed on the jetties are higher than those in the marina, reaching approximately 5.11 m with a
shoaling coefficient of about 0.48. In this case, the wave energy decreases by only 33% from its
initial state.
The analysis also reveals that all waves converge at the structure's base with a Northward
direction in the marina and a North-Northeast direction in the port. This behavior is attributed to
the presence of orthogonal lines perpendicular to the isobaths.
Numerical Modeling
45
In the marina area, the protection provided by Cape Matifou and the bathymetry result in waves
reaching the base of the structure with a height of approximately 2.49 m, with a shoaling
coefficient of about 0.43. This indicates that the waves have lost more than half of their intensity.
On the port side, since Cape Matifou does not offer any protection to the area and the waves
from this direction attack the port obliquely, the wave heights on the jetties are higher compared
to those observed in the marina, reaching approximately 4.68 m with a shoaling coefficient of
about 0.48. This means that the waves have only lost 20% of their initial energy.
It is observed that all waves arrive at the base of the structure from the North direction in the
marina and from the North-Northeast direction in the port. This observation can be explained by
the presence of orthogonal lines perpendicular to the isobaths.
Regarding the currents in the area, the winds and waves from the North-Northeast direction
generate East-West currents along the coast with an average speed of about 0.35 m/s. These
observations lead us to conclude that the current patterns in the area are not significantly
influenced by variations in wave height and period offshore.
30-Year Return Period
The results obtained for the 30-year return period are presented in Table III-7 and Figure III-8.
The analysis reveals that the Bay waves offshore retain over 92% of their initial height of 6.61 m
at the model boundaries.
Once the waves enter the bay, their hydrodynamic characteristics, including height and initial
power of 220 KW/m, gradually decrease due to friction with the seabed. This friction slows
down the wave's progression and alters its path through diffraction and refraction when
encountering obstacles, resulting in a progressive dissipation of its energy.
Concerning the Marina, the combined protection offered by Cape Matifou and the bathymetry
leads to waves reaching the base of the structure with a height of approximately 2.50 m and a
shoaling coefficient of around 0.38. This indicates a significant reduction of 63% in wave
intensity.
On the other hand, the Port area lacks the protective effect of Cape Matifou, causing waves
approaching from this direction to strike the port obliquely. As a result, the wave heights
observed on the jetties are higher than those in the marina, reaching approximately 5.11 m with a
shoaling coefficient of about 0.48. In this case, the wave energy decreases by only 33% from its
initial state.
The analysis also reveals that all waves converge at the structure's base with a Northward
direction in the marina and a North-Northeast direction in the port. This behavior is attributed to
the presence of orthogonal lines perpendicular to the isobaths.