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Heights of these structures usually range from 1 foot (0.30 m) to 10 feet (3.0 m). These structures are built by creating a slope of riprap, which consists of large boulders or less commonly, blocks of concrete. These are then cemented together ("grouted") to form the drop structure.
Bars installed using drilling techniques are usually fully grouted and installed at a slight downward inclination with bars installed at regularly spaced points across the slope face. A rigid facing (often pneumatically applied concrete, otherwise known as shotcrete) or isolated soil nail head plates may be used at the surface. [1]
Riprap causes morphological changes in the riverbeds they surround. One such change is the reduction of sediment settlement in the river channel, which can lead to scouring of the river bed as well as coarser sediment particles. This can be combatted by increasing the distance between the pieces of riprap and using a variety of sizes. [7]
Bend way weirs, spurs and guide banks can help to align the upstream flow while riprap, gabions, articulated concrete blocks and grout-filled mattresses can mechanically stabilize the pier and abutment slopes. [6] Riprap remains the most common countermeasure used to prevent scour at bridge abutments.
Shorelines and streams are protected against scour and erosion using revetments and riprap. The soil or rock itself may be improved by means such as dynamic compaction, injection of grout or concrete, and mechanically stabilized earth. Additional mitigation methods include deep foundations, tunnels, surface and subdrain systems, and other measures.
Hudson's equation, also known as Hudson formula, is an equation used by coastal engineers to calculate the minimum size of riprap (armourstone) required to provide satisfactory stability characteristics for rubble structures such as breakwaters under attack from storm wave conditions.
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Conventional riprap is a form of rock armor, rubble, or concrete used to fortify shoreline structures against the forces of erosion. Vegetated riprap is a more economically efficient form of shoreline protection that enhances fish and wildlife habitat as well as softening the appearance and improving embankment aesthetic.