Coastal Protection (DM-26.2), Section 4: Design of Rubble-Mound Structures

This section covers the design of rubble-mound structures such as breakwaters, jetties, and revetments, which are built from layers of stone or concrete armor units.

It covers general design, including armor units and design considerations, then each layer in turn: primary and secondary cover layers, underlayers, the bedding layer, and sacrificial toes. It closes with revetments, which protect a slope against wave attack.

Understanding how the layers work together, with the largest units outside to resist the waves and finer material beneath to hold the structure together, is the key to the design.

In this chapter

• General Design
  • Armor units
  • Design considerations
• Primary and Secondary Cover Layers
• Underlayers
• Bedding Layer
• Sacrificial Toes
• Revetments