Attrition (erosion)
Attrition is the process of
Attrition erosion allows past and present
Mechanism
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Pebbles tend to be larger upstream...
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...and decrease farther downstream...
The amount of attrition is dependent on a number of factors: particle properties such as size, shape, surface, porosity, hardness, and cracks, as well as environmental properties such as time, velocity, pressure, shear, and temperature.[5]
Generally, particles are more affected by attrition farther downstream, as the rivers' velocity tends to be higher, and therefore its competence (ability to carry sediment) is increased. This means that the load rubs against itself more and with more force when suspended in the river, thus increasing erosion by attrition. Although there is a point after transport over a certain distance that pebbles reach a size that is relatively immune to further attrition. Grain-size distribution of sediments produced by attrition will also be controlled by the lithology of the rock from which they are derived. Particle sizes generally decrease continuously as the river flows farther downstream, in a process called downstream fining.[6] Since attrition affects pebble size it also affects the movement of the pebbles, and the size and condition of pebbles can explain past conditions of waterways, such as flow.[7]
Rate of erosion
Rates of erosion by attrition are affected by the rocks shape, lithology, and the energy of impact,[8] therefore, softer rocks are more susceptible to attrition erosion.[9] As attrition and breakage occur on a bedrock it becomes suspended: down-stream of a river or waterway the bedload increases due to attrition. The suspended sediment is greatly affected by lithology, basin slope, precipitation, and wildfires;[10] wildfires in general significantly disturb environments and therefore their geology.[11] Erosion rates, with respect to attrition, are greatest in waterways that are steep with soft rocks,[12] such as shale, mudstone, or other common sedimentary rocks.[13]
The rounding of rocks and
Differences in lithology affect how quickly erosion (attrition) changes a
Cosmogenic exposure
Erosion can affect the cosmogenic exposure dating of boulders by altering the
Attrition in ocean environments
Attrition in ocean environments is described as “the oceans consuming the land” because the high impact energy of waves and high sedimentation allow the ocean-land contact points to be significantly eroded.[22] Ocean attrition causes shorelines to retreat and ocean depths are increased to the depth of the wave base.[23]
The rising of sea levels has led to an increase in coastal erosion. This causes concern to policymakers, coastal researchers, and real estate planners due to erosions effect on flooding.[24]
Rocky coastlines tend to lack vegetation: this leads to little or no
Attrition in volcanic settings
As ash and volcanic
Similar processes
The effects of attrition can be mistaken for the effects of sorting, in which the grain size of sediments is affected by sediment transport mechanisms e.g. suspension vs. bed load. This affects pebble beaches the most as the pebbles smash into each other, which causes them to smooth.[30] Attrition of particulate material is also observed in the chemical industry, where it is undesirable. Products can be lost through the process and contaminants can be created, requiring additional filtration.
Attrition occurring in an industrial application stems from a wide range of mechanisms: mechanical, thermal, and chemical.[31] In
References
- ^ Miller, K. L. and Jerolmack, D.: Controls on the rates and products of particle attrition by bed-load collisions, Earth Surf. Dynam. Discuss. [preprint], https://doi.org/10.5194/esurf-2020-86, in review, 2020.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along where Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Putkonen, Jaakko, and Terry Swanson. “Accuracy of Cosmogenic Ages for MorainesJaakko.” ScienceDirect, vol. 59, no. 2, Mar. 2003, pp. 255–261.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Bemrose, C.R.; Bridgwater, J. (January 1987). "A review of attrition and attrition test methods". Powder Technology. 49 (2): 97–126. doi:10.1016/0032-5910(87)80054-2. ISSN 0032-5910.
- ^ Gomez, Basil; Rosser, Brenda J.; Peacock, David H.; Hicks, D. Murray; Palmer, Julie A. (June 2001). "Downstream fining in a rapidly aggrading gravel-bed river". Water Resources Research. 37 (6): 1813–1823. Bibcode:2001WRR....37.1813G. doi:10.1029/2001wr900007. ISSN 0043-1397.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Miller, K. L. and Jerolmack, D.: Controls on the rates and products of particle attrition by bed-load collisions, Earth Surf. Dynam. Discuss. [preprint], https://doi.org/10.5194/esurf-2020-86, in review, 2020.
- ^ Jim E. O’Connor, Joseph F. Mangano, Daniel R. Wise, Joshua R. Roering; Eroding Cascadia—Sediment and solute transport and landscape denudation in western Oregon and northwestern California. GSA Bulletin 2021; DOI: https://doi.org/10.1130/B35710.1
- ^ Jim E. O’Connor, Joseph F. Mangano, Daniel R. Wise, Joshua R. Roering; Eroding Cascadia—Sediment and solute transport and landscape denudation in western Oregon and northwestern California. GSA Bulletin 2021; DOI: https://doi.org/10.1130/B35710.1
- ^ Jim E. O’Connor, Joseph F. Mangano, Daniel R. Wise, Joshua R. Roering; Eroding Cascadia—Sediment and solute transport and landscape denudation in western Oregon and northwestern California. GSA Bulletin 2021; DOI: https://doi.org/10.1130/B35710.1
- ^ Jim E. O’Connor, Joseph F. Mangano, Daniel R. Wise, Joshua R. Roering; Eroding Cascadia—Sediment and solute transport and landscape denudation in western Oregon and northwestern California. GSA Bulletin 2021; DOI: https://doi.org/10.1130/B35710.1
- ^ Assis Kanji, Milton. “Critical Issues in Soft Rocks.” ScienceDirect, vol. 6, no. 3, June 2014, pp. 186–195.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Lim, Michael, et al. “Quantifying the Controls and Influence of Tide and Wave Impacts on Coastal Rock Cliff Erosion.” Journal of Coastal Research, vol. 27, 2011, pp. 46–56.
- ^ Wood, A. “Coast Erosion at Aberystwyth; the Geological and Human Factors Involved.” Wiley Online Library, vol. 13, no. 1, Apr. 1978, pp. 61–72.
- ^ Wood, A. “Coast Erosion at Aberystwyth; the Geological and Human Factors Involved.” Wiley Online Library, vol. 13, no. 1, Apr. 1978, pp. 61–72.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.
- ^ Putkonen, Jaakko, and Terry Swanson. “Accuracy of Cosmogenic Ages for MorainesJaakko.” ScienceDirect, vol. 59, no. 2, Mar. 2003, pp. 255–261.
- ^ Putkonen, Jaakko, and Terry Swanson. “Accuracy of Cosmogenic Ages for MorainesJaakko.” ScienceDirect, vol. 59, no. 2, Mar. 2003, pp. 255–261.
- ^ Putkonen, Jaakko, and Terry Swanson. “Accuracy of Cosmogenic Ages for MorainesJaakko.” ScienceDirect, vol. 59, no. 2, Mar. 2003, pp. 255–261.
- ^ Jones, T.J., Russell, J.K. Ash production by attrition in volcanic conduits and plumes. Sci Rep 7, 5538 (2017). https://doi.org/10.1038/s41598-017-05450-6
- ^ Miller, Kimberly Litwin; Szabó, Tímea; Jerolmack, Douglas J.; Domokos, Gábor (November 2014). "Quantifying the significance of abrasion and selective transport for downstream fluvial grain size evolution". Journal of Geophysical Research: Earth Surface. 119 (11): 2412–2429. Bibcode:2014JGRF..119.2412M. doi:10.1002/2014jf003156. ISSN 2169-9003.
- ^ Bemrose, C.R.; Bridgwater, J. (January 1987). "A review of attrition and attrition test methods". Powder Technology. 49 (2): 97–126. doi:10.1016/0032-5910(87)80054-2. ISSN 0032-5910.
- ^ Bemrose, C.R.; Bridgwater, J. (January 1987). "A review of attrition and attrition test methods". Powder Technology. 49 (2): 97–126. doi:10.1016/0032-5910(87)80054-2. ISSN 0032-5910.
- ^ Anim, Mabel, and Benjamin Kofi Nyarko. “Lithological Responses to Sea Erosion along Selected Coastlines between Komenda and Saltpond, Ghana .” Ghana Journal of Geography, vol. 9, no. 1, 2017, pp. 109–126.