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| Titel |
Comparison of sampling methodologies for nutrient monitoring in streams: uncertainties, costs and implications for mitigation |
| VerfasserIn |
J. Audet, L. Martinsen, B. Hasler, H. Jonge, E. Karydi, N. B. Ovesen, Brian Kronvang |
| 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. 11 ; Nr. 18, no. 11 (2014-11-28), S.4721-4731 |
| Datensatznummer |
250120537
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| Publikation (Nr.) |
 copernicus.org/hess-18-4721-2014.pdf |
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| Zusammenfassung |
| Eutrophication of aquatic ecosystems caused by excess concentrations of
nitrogen and phosphorus may have harmful consequences for biodiversity and
poses a health risk to humans via water supplies. Reduction of nitrogen and
phosphorus losses to aquatic ecosystems involves implementation of costly
measures, and reliable monitoring methods are therefore essential to select
appropriate mitigation strategies and to evaluate their effects. Here, we
compare the performances and costs of three methodologies for the monitoring
of nutrients in rivers: grab sampling; time-proportional sampling; and
passive sampling using flow-proportional samplers. Assuming hourly
time-proportional sampling to be the best estimate of the "true" nutrient
load, our results showed that the risk of obtaining wrong total nutrient load
estimates by passive samplers is high despite similar costs as the
time-proportional sampling. Our conclusion is that for passive samplers to
provide a reliable monitoring alternative, further development is needed.
Grab sampling was the cheapest of the three methods and was more precise and
accurate than passive sampling. We conclude that although monitoring
employing time-proportional sampling is costly, its reliability precludes
unnecessarily high implementation expenses. |
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