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BreaksWaters, BreakWater Desing, Introducción, Failure Modes:
Hydraulic…
BreaksWaters
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BreakWater Layout
Stopping Area
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Design Considerations: Requires adequate space for vessels to reduce speed gradually without affecting other areas.
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Location: Typically located near the entrance but within the harbor to allow safe access and egress.
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Maneuvering Area
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Design Factors: Should consider vessel sizes, turning radii, and tidal influences.
Safety: Adequate width and depth to prevent collisions and groundings, with clear navigational markers.
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Anchorage Area
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Environmental Factors: Consideration of seabed composition, water depth, and anchor-holding capacity.
Safety: Proper spacing and depth are essential to accommodate different vessel types and ensure safe mooring.
Harbor Entrance
Function: The entry and exit point of the harbor, facilitating controlled access.
Wave Protection: Must provide adequate shielding from waves, especially under storm conditions.
Visibility and Accessibility: Entry should be wide enough for safe passage and have clear markers to ensure visibility.
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BreakWater Desing
Wave Run-up, Overtopping, Transmission, and Reflection
Wave Run-up: Dependent on slope angle, roughness, water depth, bottom slope, and wave characteristics.
Wave Run-up and Overtopping Prevention: Necessary to prevent wave energy from damaging the crest or rear face of the breakwater.
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Transmission: Occurs through overtopping or structure permeability; a critical factor in assessing lee-side wave activity.
Transmission Coefficient (Ky): Quantifies wave transmission across the breakwater, assisting in design refinements.
Vertical Breakwaters
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Pneumatic Breakwaters: Use of air bubbles to dampen wave energy, typically suited for small harbors.
Rubble-Mound Breakwaters
Purpose: Used to protect harbors by dissipating wave energy, reducing wave transmission, and minimizing reflection.
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Design Variations
Conventional Rubble-Mound Breakwater:
Structure: Includes a bedding layer, a core of quarry-run stones, one or more layers of larger stones, and an exterior armor layer of large rocks or concrete armor units.
Breakwater with Parapet Wall:
Structure: Similar to a conventional rubble-mound but includes a parapet wall along the crest to reduce wave overtopping.
Berm Breakwater:
Advantages: Cost-effective, especially at deeper sites or with high design wave conditions. Uses a single armor layer, reducing material costs.
Overview
Types of Breakwaters:
Rubble-Mound Breakwaters
Vertical Breakwaters
Composite Breakwaters
Special (Unconventional) Breakwaters
Factors for Selection
Breakwater Layout
Site Environmental Conditions
Utilization Conditions
Availability of Construction Materials and Equipment
Cost of Construction
Cost of Maintenance
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Introducción
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The purpose of this chapter is to help those involved with port design, especially those who just recently joined the field of marine engineering to better understand the phenomena of wave-structure interaction, as well as the role of breakwaters in port operation.
The material provided in this chapter is basic and should not be treated as a guideline to detailed breakwater design. References to specific information that may be helpful in detailed breakwater design are found elsewhere in this chapter.
Failure Modes:
Hydraulic Instability of Armor Layer: Ensures stability against wave forces on the seaward slope.
Instability of Low-Crested Breakwaters: Ensures height stability to prevent overtopping.
Hydraulic Instability of Rock Toe Berm: Secures the foundation for long-term durability.
Wave Run-up on Seaward Slopes: Ensures slope angles are designed to reduce excessive run-up and overtopping.
