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Riprap, also known as rip rap, rip-rap, shot rock, rock armour, or rubble, is human-placed rock or other material used to protect shoreline structures against scour and water, wave, or ice erosion. Ripraps are used to armor shorelines, streambeds, bridge abutments, foundational infrastructure supports and other shoreline structures against erosion. Common rock types used include granite and modular concrete blocks. Rubble from building and paving demolition is sometimes used, as well as specifically designed structures called tetrapods.
Ripraps cause 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. Ripraps have also been shown to cause erosion of sites downstream of the riprap.
Changes in organic material
The addition of ripraps often leads to reduced plant cover, woody material and other organic material, which can result in environmental changes such as reduced shading. Introducing ripraps, however, does produce a more rocky environment, which increases heterogeneity, creating additional niches for some organisms. The reduction in shading, along with the introduction of new niches that result from implementation of ripraps, improves survivability of certain species that have an affinity for these conditions. Yet these conditions present adverse circumstances and decreased habitability for species not accustomed to this environment.
Riprap closing off a channel on the Mississippi River
Riprap protecting a levee
Crews replacing riprap at Galveston Seawall after a 1915 hurricane
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- "What is Riprap | Muse Hauling & Grading". www.musehg.com. Retrieved 2020-12-07.
- Aguilera, Moisés A.; Arias, René M.; Manzur, Tatiana (2019). "Mapping microhabitat thermal patterns in artificial breakwaters: Alteration of intertidal biodiversity by higher rock temperature". Ecology and Evolution. 9 (22): 12915–12927. doi:10.1002/ece3.5776. ISSN 2045-7758. PMC 6875675. PMID 31788225.
- "Erosion Control Blankets vs. Rip Rap | East Coast Erosion". East Coast Erosion Control. 2020-05-22. Retrieved 2020-12-06.
- "Welcome to ROSA P |". rosap.ntl.bts.gov. Retrieved 2020-12-06.
- Reid, David; Church, Michael (2015). "Geomorphic and Ecological Consequences of Riprap Placement in River Systems". JAWRA Journal of the American Water Resources Association. 51 (4): 1043–1059. doi:10.1111/jawr.12279.
- Chhor, Auston D.; Glassman, Daniel M.; Smol, John P.; Vermaire, Jesse C.; Cooke, Steven J. (2020). "Ecological consequences of shoreline armoring on littoral fish and benthic macroinvertebrate communities in an Eastern Ontario lake". Aquatic Sciences. 82 (4): 73. doi:10.1007/s00027-020-00740-0. ISSN 1015-1621.
- Ciria-CUR (2007) - Rock Manual - The use of rock in hydraulic engineering.
- N.W.H. Allsop (2002) - Breakwaters, coastal structures and coastlines.
- US Dept. of Transportation (2004) - Trail Construction and Maintenance Notebook