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B & J Marine Group L.L.C.
Knoxville, Tennessee 37931
Phone: 865-202-6686 Fax: 865-531-6573 info@b-j-marinegroup.com www.B-J-MarineGroup.com
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| Frequently Asked Questions - B & J Marine Group |
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Glossary
Accretion
The buildup of a beach by actions either of nature (such as deposition of sand by wind or waves) or of humans (mechanical deposition of beach fill or trapping of sand behind a groin or jetty).
Artificial beach nourishment.
The process of replenishing a beach (usually sand) from another location by mechanical means.
Breakwater
A structure built either offshore from an eroding shoreline or connected to that shoreline, extending out into the water, to protect the shore from wave action, or to provide calm water for boat mooring or docking, when used to protect a harbor, basin or anchorage.
Bulkhead
A structure or partition built to retain land and prevent it from sliding into a body of water. Bulkheads also protect the land behind them from direct attack by waves.
Coastal erosion
The loss or displacement of land by the action of waves, currents, tides,waterborne ice, or impacts of storms; or the direct action of wind, runoff of surface water, or ground water seepage on a coastal bluff or beach.
Filter cloth
A special construction material, woven of modern synthetic fibers or compressed from synthetic or natural fibers, which is used extensively in marine construction behind and/or underneath erosion control structures. It is permeable enough to allow water to pass through, but impermeable enough that soil is prevented from being carried through the erosion control structure,causing the structure to become unstable and settle.
Flanking
Erosion at and around the outward ends of land-connected shore-protection projects or other hardened portions of the shoreline. When not stopped or controlled, flanking can result in the failure of shore protection devices.
Groin
A coastal erosion control structure usually built perpendicular to the shoreline to trap and hold littoral drift and slow the erosion of the shore. Groins can also be used to promote beach accretion.
Jetty
A structure extending into a body of water for the purpose of directing and confining river or tidal flow into a channel and preventing or reducing shoaling of the channel by littoral material.
Littoral drift (a.k.a. longshore drift)
The sediment (usually sand) moved along the shore in the nearshore zone by waves and currents.
Pile
A long. heavy timber or piece of metal, wood or concrete driven or jetted into the ground to serve as a support for or part of a coastal erosion control structure, dock, pier or jetty.
Recession
The net landward movement or retreat of coastal bluffs and beaches over time due to erosion. Long- and short-term recession rates are usually expressed as feet or meters per year.
Revetment
A facing of stone. concrete, and the like, built to protect a bluff, beach,embankment or structure from erosion by wave action or currents.
Riprap
A facing of stones, randomly placed,to prevent erosion or scouring. May also refer to the stone used for such a layer.
Seawall
A coastal erosion control structure built to separate the land from the water and to prevent damage from wave attack. A secondary purpose is to retain the land behind the structured.
Specifications
A detailed description of construction project particulars, such as size of stone, quality and quantify of materials, contractor performance, terms. and quality control.
Toe erosion
The erosion that occurs at the lowest point of the front slope of bluffs at the water sedge, largely as a result of the continuous removal of earthen materials by waves, tides or currents.
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