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revetment
In stream restoration, river engineering or coastal engineering, revetments are sloping structures placed on banks or cliffs in such a way as to absorb the energy of incoming water. In military engineering they are structures, again sloped, formed to secure an area from artillery, bombing, or stored explosives. River or coastal revetments are usually built to preserve the existing uses of the shoreline and to protect the slope, as defense against erosion.
==Freshwater revetments==
Many revetments are used to line the banks of freshwater rivers, lakes, and man-made reservoirs, especially to prevent damage during periods of floods or heavy seasonal rains (see riprap). Many materials may be used: wooden piles, loose-piled boulders〔Lake Ontario Riparian Alliance. ("Stone Revetments...Frequently Asked Questions." ) Accessed 2009-05-25.〕 or concrete shapes,〔(Concrete shaped revetments )〕 or more solid banks.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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