High-resolution monitoring of diffuse pollution effects in the River Eden catchment, UK - PowerPoint PPT Presentation

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High-resolution monitoring of diffuse pollution effects in the River Eden catchment, UK

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  1. 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, 25-26th February 2014

  2. Defra Demonstration Test Catchment Platform Eden (Cumbria) Livestock and mixed farming Consortium includes: Lancaster University, Newcastle University, Durham University, Newton Rigg, Eden Rivers Trust, CEH and others... 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... Three catchments representative of major UK agricultural production systems

  3. Eden Demonstration Test Catchment (DTC) 2000 km2

  4. EdenDTC 3* 10 km2

  5. EdenDTC 3* 10 km2

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

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

  8. 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

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

  10. 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

  11. 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

  12. 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