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| Titel |
High-frequency monitoring of nitrogen and phosphorus response in three rural catchments to the end of the 2011–2012 drought in England |
| VerfasserIn |
F. N. Outram, C. E. M. Lloyd, J. Jonczyk, C. McW. H. Benskin, F. Grant, M. T. Perks, C. Deasy, S. P. Burke, A. L. Collins, J. Freer, P. M. Haygarth, K. M. Hiscock, P. J. Johnes, A. L. Lovett |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 9 ; Nr. 18, no. 9 (2014-09-08), S.3429-3448 |
| Datensatznummer |
250120459
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| Publikation (Nr.) |
 copernicus.org/hess-18-3429-2014.pdf |
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| Zusammenfassung |
| This paper uses high-frequency bankside measurements from three catchments
selected as part of the UK government-funded Demonstration Test Catchments
(DTC) project. We compare the hydrological and hydrochemical patterns during
the water year 2011–2012 from the Wylye tributary of the River Avon with mixed
land use, the Blackwater tributary of the River Wensum with arable land use
and the Newby Beck tributary of the River Eden with grassland land use. The
beginning of the hydrological year was unusually dry and all three
catchments were in states of drought. A sudden change to a wet summer
occurred in April 2012 when a heavy rainfall event affected all three
catchments. The year-long time series and the individual storm responses
captured by in situ nutrient measurements of nitrate and phosphorus (total
phosphorus and total reactive phosphorus) concentrations at each site reveal
different pollutant sources and pathways operating in each catchment. Large
storm-induced nutrient transfers of nitrogen and or phosphorus to each stream
were recorded at all three sites during the late April rainfall event.
Hysteresis loops suggested transport-limited delivery of nitrate in the
Blackwater and of total phosphorus in the Wylye and Newby Beck, which was
thought to be exacerbated by the dry antecedent conditions prior to the
storm. The high rate of nutrient transport in each system highlights the
scale of the challenges faced by environmental managers when designing
mitigation measures to reduce the flux of nutrients to rivers from diffuse
agricultural sources. It also highlights the scale of the challenge in
adapting to future extreme weather events under a changing climate. |
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