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 long-term integrity of a mixed boulder and log or root wad revetment is enhanced by ensuring that the wood remains submerged as much as possible, and by using rot-resistant species of conifers such as cedar.
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.
Conwy expects about 14,000 tonnes of existing rock armour to be re-used and another 13,000 tonnes to be imported expects about 14,000 tonnes of existing rock armour to be re-used and another 13,000 tonnes to be importcrash defences to create the new sloping revetment at Llanddulas.
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.
To provide design and build services for the delivery of: The project will address the most vulnerable sections of mounts bay coastal frontage by upgrading the revetment that is provided by the great western railway main line between penzance and marazion.
Chang specifically mentioned the riverbank revetment projects of the Unified Project Management Office-Flood Control Management Cluster (UPMO-FCMC) in Marikina River below Tumana Bridge in Barangay Tumana, extending to Barangay Malanday and Barangay Tanong with combined budget allocation of P578 million.
MARINE AND COASTAL ACCESS ACT 2009 PART 4: MARINE LICENSING APPLICATION FOR A MARINE LICENCE FOR SEAWALL AND REVETMENT REPAIR WORKS, INCLUDING ROCK ARMOUR PLACEMENT, LLANFAIRFECHAN Notice is hereby given, in accordance with Part 4, Chapter 1, Section 68 of the Marine and Coastal Access Act 2009 that Alun Griffith (Contractors) Ltd has applied to Natural Resources Wales, acting on behalf of the Licensing Authority, for a marine licence to conduct repairs to the seawall and revetment and deposit of rock armour at Llanfairfechen, Conwy.
The proposals include building a rock groyne, rock revetment, promenade raising, concrete stepped revetment, reinforced concrete retaining walls and raising the existing slipway.
The second phase, which includes the construction of a revetment and fishing center in East Basseterre, is scheduled for completion in October 2002.