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Particle selectivity of sediment deposited over grass barriers and the effect of rainfall

Pan, C.; Ma, L.; Wainwright, J.

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Authors

C. Pan

L. Ma



Abstract

Particle selectivity of the sediment deposited over vegetative barriers is of importance to predict sediment transport and particulate pollutant load into surface waters. Grassed barriers with 20–90% covers at 15° slope were subjected to silt-laden inflows in the presence and absence of simulated rainfalls to investigate the sediment deposition processes. The results show that regrass of steep croplands can effectively trap eroded sediment from upslope, and the rowed grass barriers can strengthen sediment deposition. The deposition order of sediment particle sizes (μm) follows (>50) > (25–50) > (10–25) = (<2) > (2–10), and the particle selectivity weakens with increasing grass covers. Clay particles had a similar deposition efficiency to overall sediment, implying the effectiveness of regrass in controlling soil nutrient loss. The contribution of grass to total overland flow resistance is almost equivalent to the percentage of grass cover. For steep grassed slopes, raindrop impact significantly decreases sediment deposition, but limitedly affects particle selectivity of deposited sediment and overland flow hydraulics. Both raindrop kinetic energy and stream power available for surface soil contribute to sediment deposition in net deposition areas of grass barriers. These imply that rainfall effect on sediment delivery over vegetated barriers derives from the additional raindrop energy, rather than the variation in runoff hydraulics. These results can help to clarify the effect of raindrop impact on sediment transport and to evaluate the benefit of revegetation in decreasing sediment yield and its particulate nutrient load into surface waters.

Citation

Pan, C., Ma, L., & Wainwright, J. (2016). Particle selectivity of sediment deposited over grass barriers and the effect of rainfall. Water Resources Research, 52(10), 7932-7979. https://doi.org/10.1002/2016wr019010

Journal Article Type Article
Acceptance Date Sep 21, 2016
Online Publication Date Oct 18, 2016
Publication Date Oct 18, 2016
Deposit Date Feb 16, 2017
Publicly Available Date Apr 18, 2017
Journal Water Resources Research
Print ISSN 0043-1397
Electronic ISSN 1944-7973
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 52
Issue 10
Pages 7932-7979
DOI https://doi.org/10.1002/2016wr019010
Public URL https://durham-repository.worktribe.com/output/1364304

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Copyright Statement
Pan, C., L. Ma, and J. Wainwright (2016), Particle selectivity of sediment deposited over grass barriers and the effect of rainfall, Water Resources Research, 52, 7963–7979, doi:10.1002/2016WR019010. To view the published open abstract, go to https://doi.org/ and enter the DOI.






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