New Stability Formula for Rubble Mount Armor Units of Composite Breakwaters

The composite breakwater is one of the typical structures of breakwaters. In composite breakwaters, the stability of the rubble mound foundation plays quite an important role as that of a caisson. The rubble mound is usually protected by armor units, large stones or concrete blocks. This is to prevent dispersion of the rubble stones and deformation of the mound due to the action of the waves. The stable mass of the rubble mound armor units of composite breakwaters is generally calculated using the stability formula based on Ns (Berbner and Donnelly, 1962). As to the stability number Ns, Tanimoto et al. (1982) proposed a formula for the stability of rubble mound armor units based on the standing wave theory and the stability of rubble mound armor units based on the standing wave theory and Kimura et al. (1998) modified Tanimoto’s formula especially for concrete armor units. In recent years, there is more attention paid to maritime structures with high rubble mounds from the viewpoint of harmony with the sea environment. In high rubble mounds, there is a high possibility that impact breaking wave action occurs on the mound. Tanimoto’s formula can not be applied in this case because it is based on cases where the water depth on the mound is comparatively large. Although Kimura’s formula covers a high rubble mound, it does not take impact breaking waves into consideration. In this study, the stability of concrete armor blocks covering the rubble mound was carefully examined in a two-dimensional model test. From these results, a method to calculate the necessary mass of armor blocks for composite breakwaters is newly proposed, in which the impact breaking waves is taken into account.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0784407339
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Matsuda, Setsuo
  • Nighigori, Wakiro
  • Matsumoto, Akira
  • Saito, Masafumi
  • Matsuoka, Michio
  • Hanzawa, Minoru
• Conference:
  • Coastal Structures 2003
  • Location: Portland Oregon, United States
  • Date: 2003-8-26 to 2003-8-30
• Publication Date: 2004

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 330-342
• Monograph Title: Coastal Structures 2003

Subject/Index Terms

• TRT Terms: Breakwaters; Caissons; Composite structures; Concrete construction; Mechanical stability; Protection against environmental damage; Rubble mound breakwaters; Sea walls; Shore protection; Stability analysis; Waves
• Subject Areas: Bridges and other structures; Marine Transportation; Materials;

Filing Info

• Accession Number: 01003499
• Record Type: Publication
• ISBN: 0784407339
• Files: TRIS
• Created Date: Aug 30 2005 10:19AM