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Titel |
Dissolved and particulate nutrient transport dynamics of a small Irish catchment: the River Owenabue |
VerfasserIn |
S. T. Harrington, J. R. Harrington |
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. 6 ; Nr. 18, no. 6 (2014-06-17), S.2191-2200 |
Datensatznummer |
250120384
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Publikation (Nr.) |
copernicus.org/hess-18-2191-2014.pdf |
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Zusammenfassung |
The objective of this research was to investigate the relationship between
water and sediment discharge on the transport of nutrients: nitrogen and
phosphorus. Water discharge, suspended sediment concentration and dissolved
and particulate forms of nitrogen and phosphorus were monitored on the 105 km2
River Owenabue catchment in Ireland.
Water discharge was found to have an influence on both particulate and
dissolved nutrient transport, but more so for particulate nutrients. The
particulate portion of N and P in collected samples was found to be 24
and 39%, respectively. Increased particulate nitrogen concentrations were
found at the onset of high discharge events, but did not correlate well to
discharge. High concentrations of phosphorus were associated with increased
discharge rates and the coefficient of determination (r2) between most
forms of phosphorus and both discharge and suspended sediment concentrations
were observed to be greater than 0.5.
The mean TN yield is 4004 kg km−2 yr−1 for the full 29-month
monitoring period with a mean PN yield of 982 kg km−2 yr−1, 25%
of the TN yield with the contribution to the yield of PN and PP estimated to
be 25 and 53% respectively. These yields represent a PN and PP
contribution to the suspended sediment load of 5.6 and 0.28%
respectively for the monitoring period.
While total nitrogen and total phosphorus levels were similar to other
European catchments, levels of bio-available phosphorus were elevated
indicating a potential risk of eutrophication within the river. |
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