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| Titel |
Technical Note: Assessing a 24/7 solution for monitoring water quality loads in small river catchments |
| VerfasserIn |
P. Jordan, R. Cassidy |
| 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 ; 15, no. 10 ; Nr. 15, no. 10 (2011-10-11), S.3093-3100 |
| Datensatznummer |
250012988
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| Publikation (Nr.) |
 copernicus.org/hess-15-3093-2011.pdf |
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| Zusammenfassung |
| Quantifying nutrient and sediment loads in catchments is difficult owing to
diffuse controls related to storm hydrology. Coarse sampling and
interpolation methods are prone to very high uncertainties due to
under-representation of high discharge, short duration events. Additionally,
important low-flow processes such as diurnal signals linked to point source
impacts are missed. Here we demonstrate a solution based on a
time-integrated approach to sampling with a standard 24 bottle autosampler
configured to take a sample every 7 h over a week according to a
Plynlimon design. This is evaluated with a number of other sampling
strategies using a two-year dataset of sub-hourly discharge and phosphorus
concentration data. The 24/7 solution is shown to be among the least
uncertain in estimating load (inter-quartile range: 96% to 110% of
actual load in year 1 and 97% to 104% in year 2) due to the increased
frequency raising the probability of sampling storm events and point source
signals. The 24/7 solution would appear to be most parsimonious in terms of
data coverage and certainty, process signal representation, potential
laboratory commitment, technology requirements and the ability to be widely
deployed in complex catchments. |
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