Storm even suspended sediment-discharge hysteresis and controls in agricultural watersheds: implications for watershed scale sediment management
Article
Article Title | Storm even suspended sediment-discharge hysteresis and controls in agricultural watersheds: implications for watershed scale sediment management |
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ERA Journal ID | 4674 |
Article Category | Article |
Authors | Sherriff, Sophie C. (Author), Rowan, John S. (Author), Fenton, Owen (Author), Jordan, Philip (Author), Melland, Alice R. (Author), Mellander, Per-Erik (Author) and O'hUallachain, Daire (Author) |
Journal Title | Environmental Science and Technology |
Journal Citation | 50 (4), pp. 1769-1778 |
Number of Pages | 10 |
Year | 2016 |
Publisher | American Chemical Society |
Place of Publication | United States |
ISSN | 0013-936X |
1520-5851 | |
Digital Object Identifier (DOI) | https://doi.org/10.1021/acs.est.5b04573 |
Web Address (URL) | http://pubs.acs.org/doi/abs/10.1021/acs.est.5b04573 |
Abstract | Within agricultural watersheds suspended sediment-discharge hysteresis during storm events is commonly used to indicate dominant sediment sources and pathways. However, availability of high-resolution data, qualitative metrics, longevity of records, and simultaneous multiwatershed analyses has limited the efficacy of hysteresis as a sediment management tool. This two year study utilizes a quantitative hysteresis index from high-resolution suspended sediment and discharge data to assess fluctuations in sediment source location, delivery mechanisms and export efficiency in three intensively farmed watersheds during events over time. Flow-weighted event sediment export was further considered using multivariate techniques to delineate rainfall, stream hydrology, and antecedent moisture controls on sediment origins. Watersheds with low permeability (moderately- or poorly drained soils) with good surface hydrological connectivity, therefore, had contrasting hysteresis due to source location (hillslope versus channel bank). The well-drained watershed with reduced connectivity exported less sediment but, when watershed connectivity was established, the largest event sediment load of all watersheds occurred. Event sediment export was elevated in arable watersheds when low groundcover was coupled with high connectivity, whereas in the grassland watershed, export was attributed to wetter weather only. Hysteresis analysis successfully indicated contrasting seasonality, connectivity and source availability and is a useful tool to identify watershed specific sediment management practices. |
ANZSRC Field of Research 2020 | 300201. Agricultural hydrology |
300202. Agricultural land management | |
410404. Environmental management | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | University of Dundee, United Kingdom |
Teagasc Agriculture and Food Development Authority, Ireland | |
University of Ulster, United Kingdom | |
National Centre for Engineering in Agriculture | |
Environmental Protection Agency, Ireland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3480/storm-even-suspended-sediment-discharge-hysteresis-and-controls-in-agricultural-watersheds-implications-for-watershed-scale-sediment-management
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