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Numerical Analysis of the Armour Layer Stability in Rubble-Mound Breakwaters

Sarfaraz, Mohammad | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43284 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Pak, Ali
  7. Abstract:
  8. Rubble-mound breakwaters are one of the most customary breakwaters, which make a calm and safe area for ships to berth. To protect these structures from sea wave attacks, armour layers consisting of rocks or concrete blocks are put on their outer surface. Providing the stability of the armour layer is an important procedure in the design of breakwaters. Until now, design of the armour layer is based on the empirical formulae and physical modeling tests. The current research aims to study the stability of the armour layer by the numerical method and employing the commercial code FLOW-3D. In the present research, the effect of geometrical parameters such as breakwater slope and armour diameter and also physical parameters such as wave height and period, and still water depth on the stability of the armours is studied. For this purpose, four locations consisting of breakwater toe, still –water level and maximum of wave run-up and run-down levels are selected for placement of the armours. The breakwater is assumed to be high-crested, trapezoidal in shape. The armours are cubical and rigid. Also monochromic waves are used in this study. Analysis are made of forces and moments acting on the armours, and three instability modes, i.e. uplift, sliding and overturning for the given parameters. The results show that wave breaking type has an important effect on the behavior of forces and stabilities implied at the armours. Also results indicate that the armours placed in the still water and maximum wave run-down levels are the most critical ones. Finally some formulae are presented for computing wave forces, moments and stability numbers for armour blocks in different locations. Using these formulae allows the user to compare the stability modes of the armour for different wave characteristics.
  9. Keywords:
  10. Fluid-Structure Interaction ; Numerical Modeling ; Coastal Protection Structures ; Rubble Mounted Breakwaters ; Concrete Armour Layer Stability ; Sea Wave Loads

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