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Trends and seasonality in stream water chemistry in two moorland catchments of the Upper River Wye, Plynlimon

Reynolds, B.; Renshaw, M.; Sparks, T.H.; Crane, S.; Hughes, S.; Brittain, S.A.; Kennedy, V.H.. 1997 Trends and seasonality in stream water chemistry in two moorland catchments of the Upper River Wye, Plynlimon. Hydrology and Earth System Sciences, 1 (3). 571-581.

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Abstract/Summary

Stream water chemistry in the Cyff and Gwy subcatchments within the headwaters of the River Wye has been monitored regularly since 1980. In the Gwy, which is a predominantly semi-natural grassland catchment, land use has remained relatively static over the monitoring period, whilst the Cyff catchment is more buffered because of base cation inputs from agricultural improvement and ground water sources. Using a variety of statistical techniques, the long-term data are examined for evidence of trends after eliminating seasonal effects. The results highlight some of the difficulties associated with the analysis of longterm water quality data which show considerable variability over a variety of timescales. Some of this variability can be explained in terms of hydrochemical responses to climatic extremes and episodic events such as large atmospheric inputs of seasalts. The long-term fluctuations in solute concentration underline the continuing need for maintaining consistent long-term monitoring at sensitive upland sites if underlying trends related to gradual changes in pollutant deposition or climate are to be detected with any certainty.

Item Type: Publication - Article
Programmes: CEH Programmes pre-2009 publications > Other
CEH Sections: _ Pre-2000 sections
ISSN: 1027-5606
NORA Subject Terms: Hydrology
Date made live: 01 Jun 2009 08:59
URI: http://nora.nerc.ac.uk/id/eprint/7331

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