Understanding the controls on deposited fine sediment in the streams of agricultural catchments

The Science of the Total Environment
P S NadenJ I Jones

Abstract

Excessive sediment pressure on aquatic habitats is of global concern. A unique dataset, comprising instantaneous measurements of deposited fine sediment in 230 agricultural streams across England and Wales, was analysed in relation to 20 potential explanatory catchment and channel variables. The most effective explanatory variable for the amount of deposited sediment was found to be stream power, calculated for bankfull flow and used to index the capacity of the stream to transport sediment. Both stream power and velocity category were highly significant (p ≪ 0.001), explaining some 57% variation in total fine sediment mass. Modelled sediment pressure, predominantly from agriculture, was marginally significant (p<0.05) and explained a further 1% variation. The relationship was slightly stronger for erosional zones, providing 62% explanation overall. In the case of the deposited surface drape, stream power was again found to be the most effective explanatory variable (p<0.001) but velocity category, baseflow index and modelled sediment pressure were all significant (p<0.01); each provided an additional 2% explanation to an overall 50%. It is suggested that, in general, the study sites were transport-limited and the majority of s...Continue Reading

References

Mar 1, 1997·Environmental Management·P J WOOD, P D ARMITAGE
Oct 28, 2011·Journal of Environmental Quality·Christopher S Jones, Keith E Schilling
Nov 17, 2011·Environmental Management·Christina D RelyeaRobert J Danehy
Jan 6, 2012·Journal of Environmental Quality·Glenn A BenoyRobert B Brua
Oct 17, 2015·The Science of the Total Environment·D A SearP S Naden

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Citations

Oct 3, 2018·Journal of Environmental Quality·Christopher Konrad, Allen Gellis
Apr 30, 2017·Environmental Geochemistry and Health·Zhuo GuanBrian J Reid
Dec 25, 2019·Scientific Reports·Paula C Dos Reis OliveiraPiet F M Verdonschot
Nov 18, 2018·The Science of the Total Environment·V C ShrutiFrancisco Rodríguez-González
Apr 21, 2021·Archives of Environmental Contamination and Toxicology·Mark D ShentonBen J Kefford

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