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A method of computing uncertain nitrogen and phosphorus loads in a small stream from an agricultural catchment using continuous monitoring data
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
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2012 (English)In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 458-459, 1-8 p.Article in journal (Refereed) Published
Abstract [en]

A method for computing loads of total phosphorus and nitrate from a small catchment in the Czech Republic has been presented, given continuous measurements of water levels, turbidity and an ion-specific NO3--N probe together with a limited number of discharge measurements and analyses of grab samples. Given the observed variability in the observations, log-log regressions are used to convert water levels to discharge and to derive continuous estimates of total phosphorus and nitrate. Integrations to estimate loads using predicted values of the true discharges and concentrations are then carried out by a Monte Carlo method to avoid strong assumptions of independence and distribution. Coefficients of variation for the estimated monthly loads range from 5% to 23% for TP and 12-36% for NO3--N. At the annual time scales, coefficients of variation are of the order of 5% for both TP and NO3--N. The variability in the estimated annual loads between the years was, however, significantly larger than the uncertainties estimated within each year.

Place, publisher, year, edition, pages
2012. Vol. 458-459, 1-8 p.
Keyword [en]
Uncertainty estimation, Rating curve, Monte Carlo sampling, Nutrient loads
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-181855DOI: 10.1016/j.jhydrol.2012.05.060ISI: 000307685900001OAI: oai:DiVA.org:uu-181855DiVA: diva2:558034
Available from: 2012-10-01 Created: 2012-10-01 Last updated: 2012-10-01Bibliographically approved

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Beven, Keith J.
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