High-resolution monitoring of diffuse pollution effects in the River Eden catchment, UK Dr Ben Surridge Lancaster Environment Centre, Lancaster University.

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Presentation transcript:

High-resolution monitoring of diffuse pollution effects in the River Eden catchment, UK Dr Ben Surridge Lancaster Environment Centre, Lancaster University PPM-nutrients workshop, Beijing, China, th February 2014

Defra Demonstration Test Catchment Platform Wensum (Norfolk) Arable farming Consortium includes: University of East Anglia, Scott Wilson, Cranfield University, British Geological Survey, Entec, NIAB and others... Avon (Hampshire) Mixed lowland farming Consortium includes: ADAS, University of Reading, University of Bristol, QMUL, ENTEC and others... Eden (Cumbria) Livestock and mixed farming Consortium includes: Lancaster University, Newcastle University, Durham University, Newton Rigg, Eden Rivers Trust, CEH and others... Three catchments representative of major UK agricultural production systems

Eden Demonstration Test Catchment (DTC) 2000 km 2

EdenDTC 3* 10 km 2

EdenDTC 3* 10 km 2

An integrated monitoring platform Combining data from the same location at high- frequency: –Water quality –Discharge –Biological quality

Quantifying annual/seasonal patterns in load and concentration Autumn/winter 2011/2012Spring 2012Summer 2012

Understanding concentration and load patterns Wet summer 2012 significantly impacts total load and seasonal distribution of load Annual concentration- discharge relationships lead to hypotheses about sources of nutrients

Understanding event-scale responses Autumn/winter event Summer event Hypothesis: changes in nitrate source between autumn and summer runoff events

Looking ‘inside’ a runoff event Hysteresis in concentration- discharge relationships For TRP – higher concentration on the falling compared to rising limb Hypothesis: transport-limited source of P drives TRP, not source-exhaustion Outram et al. (In review) HESS

Biological effects of chemical water quality Benthic biofilm used as a bioindicator, particularly the diatom community Sensitive to nutrient availability (P, Si) Sensitive to variation in river discharge

Biological effects of chemical water quality Seasonal variability in descriptors of benthic diatom community Hypotheses: a response to seasonal changes in water quality or river discharge