Nitrate concentrations in river waters of the upper Thames and its tributaries

The Science of the Total Environment
Colin NealHeather Wickham

Abstract

The spatial and temporal patterns of in-stream nitrate concentrations for the upper Thames and selected tributaries are described in relation to point and diffuse sources for these rural catchments. The rivers associated with catchments dominated by permeable (Cretaceous Chalk) bedrock show a smaller range in nitrate concentrations than those associated with clay and mixed sedimentary bedrock of lower permeability. The differences reflect the contrasting nature of water storage within the catchments and the influence of point and diffuse sources of nitrate. Nitrate concentrations often increase in a gradual way as a function of flow for the rivers draining the permeable catchments, although there is usually a minor dip in nitrate concentrations at low to intermediate flow due to (1) within-river uptake of nitrate during the spring and the summer when biological activity is particularly high and (2) a seasonal fall in the water table and a change in preferential flow-pathway in the Chalk. There is also a decrease in the average nitrate concentration downstream for the Kennet where average concentrations decrease from around 35 to 25 mg NO(3) l(-1). For the lower permeability catchments, when point source inputs are not of major ...Continue Reading

References

Jun 10, 2000·The Science of the Total Environment·C NealL K Hill
Jun 10, 2000·The Science of the Total Environment·C NealM Harrow
Feb 16, 2002·The Science of the Total Environment·Helen P JarviAlison Love
Feb 16, 2002·The Science of the Total Environment·P G WhiteheadD Butterfield
Feb 21, 2002·The Science of the Total Environment·Paul J A Withers, Eunice I Lord
Sep 23, 2003·The Science of the Total Environment·R R CaveH Davies
Sep 23, 2003·The Science of the Total Environment·K J Limbrick
Sep 23, 2003·The Science of the Total Environment·David B Boorman
Sep 23, 2003·The Science of the Total Environment·David B Boorman
May 24, 2005·The Science of the Total Environment·Colin NealHeather Wickham
Oct 18, 2005·The Science of the Total Environment·Helen P JarviePaul J A Withers
Oct 29, 2005·The Science of the Total Environment·Colin NealHeather Wickham
Apr 4, 2006·The Science of the Total Environment·Andrew J Wade

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Citations

Dec 21, 2013·Journal of Environmental Health Science & Engineering·Anoushiravan Mohseni-BandpiMohammad Ali Zazouli
Dec 1, 2009·The Science of the Total Environment·Ishaq A MianMalcolm S Cresser
May 16, 2006·The Science of the Total Environment·Andrew J Wade
Oct 25, 2008·Journal of Environmental Quality·Clément TisseuilSovan Lek

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