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Legacy sediment

Legacy sediment (LS) is depositional bodies of sediment inherited from the increase of human activities since the Neolithic.[1][2] These include a broad range of land use and land cover changes, such as agricultural clearance,[3][4][5][6][7] lumbering and clearance of native vegetation,[8][9][10] mining,[11][12][13] road building,[14][15][16][17] urbanization,[18][19][20] as well as alterations brought to river systems in the form of dams and other engineering structures meant to control and regulate natural fluvial processes (erosion, deposition, lateral migration, meandering).[21][22][23] The concept of LS is used in geomorphology, ecology, as well as in water quality and toxicological studies.

LS is distributed in spatially heterogeneous ways throughout a landscape and accumulates to form various landforms. It can progress through the fluvial system through facies changes from hillslope colluvium, to floodplain and wetland alluvium, to fine-grained lacustrine and estuarine slackwater deposits.[1] The temporal nature of LS is time-transgressive, meaning that initiation and peak rates of deposition can take place at different times within a fluvial system, as well as at different times between regions. The intermittent transport of LS can be thought of as a cascading system that reworks LS deposits from hillslopes, into channels and onto floodplains, such that anthropogenic sediment will be mixed with and non-anthropogenic sediment.[24]

River systems record past and present imprints of anthropogenically-forced changes to the environment. LS is an element of change in this context, as it drives fluxes of energy and matter (connectivity) through fluvial systems and provides indication of past land-uses and river dynamics that can inform future trajectories of river response. In this sense, acknowledging the concept of LS can benefit informed policy development in stream restoration,[1] water quality [25] and sediment budget[26] management, protection of aquatic ecosystems,[27] and flood risk. Moreover, the implications of legacy effects associated with anthropogenically modified sediment dynamics are critical in the context of ecosystem services.[28]

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  11. ^ Gilbert, G.K (1917). "Hydraulic mining debris in the Sierra Nevada" (PDF). U.S. Geological Survey Professional Paper. Professional Paper. 105. doi:10.3133/pp105.
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  14. ^ Froehlich, W. (1991). "Sediment production from unmetalled road surfaces. Sediment and Stream Water Quality in a Changing Environment: Trends and Explanation". IAHS Publication. 203: 21–29.
  15. ^ Luce, Charles H.; Black, Thomas A. (1999-08-01). "Sediment production from forest roads in western Oregon". Water Resources Research. 35 (8): 2561–2570. Bibcode:1999WRR....35.2561L. CiteSeerX 10.1.1.364.1533. doi:10.1029/1999wr900135. ISSN 1944-7973. S2CID 15196685.
  16. ^ Wemple, Beverley C.; Swanson, Frederick J.; Jones, Julia A. (2001-02-01). "Forest roads and geomorphic process interactions, Cascade Range, Oregon". Earth Surface Processes and Landforms. 26 (2): 191–204. Bibcode:2001ESPL...26..191W. doi:10.1002/1096-9837(200102)26:2<191::aid-esp175>3.0.co;2-u. ISSN 1096-9837.
  17. ^ Erskine, Wayne D. (2013-03-15). "Soil colour as a tracer of sediment dispersion from erosion of forest roads in Chichester State Forest, NSW, Australia". Hydrological Processes. 27 (6): 933–942. Bibcode:2013HyPr...27..933E. doi:10.1002/hyp.9412. ISSN 1099-1085. S2CID 128936558.
  18. ^ Wolman, M. Gordon (1967). "A Cycle of Sedimentation and Erosion in Urban River Channels". Geografiska Annaler: Series A, Physical Geography. 49 (2/4): 385–395. doi:10.2307/520904. JSTOR 520904.
  19. ^ Bledsoe, Brian P.; Watson, Chester C. (2001-04-01). "Effects of Urbanization on Channel Instability1". JAWRA Journal of the American Water Resources Association. 37 (2): 255–270. Bibcode:2001JAWRA..37..255B. doi:10.1111/j.1752-1688.2001.tb00966.x. ISSN 1752-1688. S2CID 129927981.
  20. ^ Chin, Anne (2006). "Urban transformation of river landscapes in a global context". Geomorphology. 79 (3–4): 460–487. Bibcode:2006Geomo..79..460C. doi:10.1016/j.geomorph.2006.06.033.
  21. ^ Surian, Nicola (1999-11-01). "Channel changes due to river regulation: the case of the Piave River, Italy". Earth Surface Processes and Landforms. 24 (12): 1135–1151. Bibcode:1999ESPL...24.1135S. doi:10.1002/(sici)1096-9837(199911)24:12<1135::aid-esp40>3.0.co;2-f. ISSN 1096-9837.
  22. ^ Nilsson, Christer; Reidy, Catherine A.; Dynesius, Mats; Revenga, Carmen (2005-04-15). "Fragmentation and Flow Regulation of the World's Large River Systems". Science. 308 (5720): 405–408. Bibcode:2005Sci...308..405N. doi:10.1126/science.1107887. ISSN 0036-8075. PMID 15831757. S2CID 34820022.
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