revetment


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revetment

[rə′vet·mənt]
(civil engineering)
A facing made on a soil or rock embankment to prevent scour by weather or water.
(ordnance)
A retaining wall with a facing such as concrete or stone, commonly used for fortifications or to protect against explosions.

Revetment

A facing or veneer of stone, concrete, or other materials constructed on a sloping embankment, dike, or beach face to protect it against erosion caused by waves or currents. The revetment may be a rigid cast-in-place concrete structure; but more commonly it is a flexible structure constructed of stone riprap or interlocking concrete blocks. It is sometimes an articulated block structure where the armor blocks are set in a form known as a flexible carpet; that is, the blocks interlock for stability, but the interlocking makes them flexible enough to respond to settlement of the underlying soil. A flexible revetment provides protection from exterior hydraulic forces, and it also can tolerate some settlement or consolidation of the underlying soil.

A typical revetment might employ stone riprap as the armor material (see illustration). A revetment typically has three major components: (1) the armor layer, which resists the wave or current-induced hydraulic forces; (2) a filter layer under the armor layer to allow water seepage out of the underlying soil without the removal of fine soil particles; and (3) a mechanism to stabilize the structure toe. Toe stabilization is particularly important where waves break on the structure, but may not be necessary if the revetment extends to sufficient depths where hydraulic forces will not erode the toe of the slope. The design water level (see illus.) for the structure may be higher than the normal water level during nonstorm conditions. If the revetment is exposed to waves that will break and run up the face of the revetment, the upper extent of the revetment must be sufficiently high to counter the force exerted by the waves.

Although stone riprap is the most commonly used material for revetment armor layers, a wide variety of other materials have been used, including cast-in-place concrete and poured asphalt, wire bags filled with stone (gabions), interlocking concrete blocks, soil cement, cement-filled bags, interlocked tires, woven wooden mattresses, and vegetation (only used for surfaces exposed to very low waves or slow-moving currents). See Retaining wall, River engineering

revetment

1. Any facing of stone, metal, or wood over a less attractive or less durable substance or construction.
2. A retaining wall or breast wall; a facing on an embankment to prevent erosion.

revetment

An area protected on three sides by sandbags, concrete, compacted earth, or other material. The aim is to provide blast protection to the aircraft, weapon system, or essential equipment inside and beyond the revetment. Also called a blast fence, open blast pen, or hardened shelter.
References in periodicals archive ?
Four bayside revetments are under construction in Eastham this year, Andres said.
The aquatic habitat value of the revetment can be enhanced by using much larger boulders than actually required to resist local current velocities.
He said: "I shall attempt to prove that the interpretation of planning policy is flawed and that the revetment will not be seen."
Site A - Pantai Murni, Kedah: The site of this excavation is a coastal revetment structure located near the Pantai Murni river mouth.
Public Works and Highways Secretary Mark Villar said the revetment structures were recently completed, benefiting municipalities of Zamboanga Sibugay, in the Zamboanga Peninsula Region.
A revetment or barrier which will be 2.1m thick and 6.7m high will be built, and the existing beach access will be refurbished.
The work will consist of the construction of a new rock groyne, rock revetment, sheet piling, promenade raising, concrete stepped revetment, reinforced concrete retaining walls and wave return wall and raising existing slipway.
A quarry and a building potentially housing workers and other civilians had been mistaken for a revetment, which is a defensive area the Iraqi army use to dig in and hide tanks.
Revetment works have been done at a cost of US$10.2 million by Corvara, using huge boulders to protect the bulkhead.
The project design includes a 1,325 linear foot armor stone revetment made up of 3-foot diameter boulders to absorb the wave action as it comes in from Lake Erie.A pedestrian pathway is also planned to run along the top of the revetment, which would stretch long the entire length of the project.
The project covers the construction of revetment and spurdike along the riverbanks of Barangays Alibago, Enrile, and Cataggaman, Tuguegarao City.
In the long-term, we're looking at constructing a revetment in the area,' Villar said.