Coastal erosion Types of erosion What is breakwater ? Types of breakwaters Consideration FLOATING BREAKWATERS The efficiency of a floating breakwater To be effective as a breakwater …

1. Breakwater
BY : Abd-elrhman Hesham Moez
Department : marine engineering
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2. Costal erosion
Is the wearing away of land and the removal of beach
or due to due sediments by wave action , tidal currents
or drainage .
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3. Erosion
corrosion
abrasion
Types of
erosion
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4. What is breakwater ?
A breakwater is a structure constructed for forming an artificial
harbor with a basin so protected from the effect of waves as to
provide safe berthing for fishing vessels
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Types of breakwaters
Natural rock Concrete Combination

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7. Considerations
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In the presence of thick sand deposits, a rubble foundation
with adequate scour protection is recommended lest strong
tidal streams, water currents or wave turbulence scour away
the sand underneath the foundation.
The core of a solid breakwater should be cast in concrete; not
more than 50 percent of this concrete may be replaced by
pieces of rock.

8. consideration
1- water depths
2- type of foundation
3- wave height
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10. FLOATING BREAKWATERS
• are pontoon structures, although various
modifications to their shape have been investigated in
an effort to optimize the mass
• (and ultimately the cost).
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12. To be effective as a breakwater …
• the motions of a floating structure must be of small amplitude.
• the structure must respond to a spectrum of incident wave
conditions.
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13. The efficiency of a floating breakwater
depends primarily on the ratio of :
the width of the pontoon
to
the wavelength of the oncoming waves
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14. FLOATING BREAKWATERS
• not suitable for creating protected areas should never be installed.
• on lake shores, where the waves tend to be very short (choppy) can
installed.
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15. Thank you