Water quality trends at an upland site in Wales, UK, 1983-1993

Hydrological Processes

Volumn 10, Issue 2, 1996, Pages 183-203

  Robson, A J ^a   Neal, C ^a  

^a CENTRE FOR ECOLOGY AND HYDROLOGY   (United Kingdom)

Author keywords

Plynlimon, Wales; Robust regression; Seasonal Kendall; Trends; Water quality

Indexed keywords

ACIDIFICATION; TRENDS; WATER QUALITY;

EID: 0029672588     PISSN: 08856087     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1099-1085(199602)10:2<183::AID-HYP356>3.0.CO;2-8     Document Type: Article

References (43)

1. Becker, R. A., Chambers, J. M., and Wilks, A. R. 1988. The New S Language. Wadsworth and Brooks/Cole Computer Science Series, Pacific Grove. 1702 pp.
2. Berryman, D., Bobee, B., Cluis, D., and Haemmerli, J., 1988. 'Nonparametric tests for trend detection in water quality time series', Wat. Resour. Bull. 24, 545-556.
3. Chambers, J. M. and Hastie, T. J. 1992. Statistical Models in S. Wadsworth and Brooks/Cole Advanced Books and Software, Pacific Grove. 608pp.
4. Christophersen, N., Robson, A., Neal, C., Whitehead, P. G., Vigerust, B., and Henriksen, A., 1990. 'Evidence for long term deterioration of stream water chemistry and soil acidification at the Birkenes site', J. Hydrol., 116, 63-76.
5. Cleveland, W. S. 1979. 'Robust locally weighted regression and smoothing scatterplots', J. Am. Statis. Soc., 74, 386; 829-836.
6. Cleveland, R. B., Cleveland, W. S., McRae, J. E., and Terpening, I., 1990.'STL: a seasonal-trend decomposition procedure based on Loess', J. Off. Statis., 6, 3-73.
7. Davies, T. D., Tranter, M., Wigington Jr, P. J., and Eshleman, K. N., 1992. 'Acidic episodes in Europe', J. Hydrol., 132, 25-70.
8. Durand, P., Neal, C., Jeffery, H. A., Ryland, G. P., and Neal, M. 1994. 'Minor, major and trace element mobility in the Plynlimon afforested catchments (Wales): general trends, and effects of felling and climate variations', J. Hydrol., 157, 139-156.
9. Haslett, J. and Rafferty, A. E. 1989. 'Space-time modelling with long memory dependence: assessing Ireland's wind power resource', Appl. Statis., 38, 1-50.
10. Hemond, H. F. 1994. 'Role of organic acids in acidification of fresh waters' in Steinberg, C. E. W. and Wright, R. F. (eds), Acidification of Fresh Waters; Implications for the Future. Wiley, Chichester. pp. 103-115.
11. Hirsch, R. M. and Slack, J. R. 1984. 'A nonparametric text for seasonal data with serial dependence', Wat. Resour. Res., 20, 727-732.
12. Hirsch, R. M., Slack, J. R., and Smith, R. A. 1982. 'Techniques of trend analysis for monthly water quality data', Wat. Resour. Res., 18, 107-121.
13. Hirsch, R. M., Alexander, R. B., and Smith, R. A. 1991. 'Selection of methods for the detection and estimation of trends in water quality', Wat. Resour. Res., 27, 803-813.
14. Hornung, M., Roda, F., and Langan, S. J. 1990. 'A review of small catchments in Western Europe producing hydrochemical budgets', Air Pollut. Res. Rep. 28. Commission of the European Communities, Brussels.
15. Kahl, J. S., Haines, T. A., Norton, S. A., and Davis, R. B. 1993. 'Recent trends in the acid base status of surface waters in Maine, USA', Wat. Air. Soil Pollut., 67, 281-300.
16. Kay, D., Boon, R., and Crowther, J. 1989. 'Coloured waters in Wales: spatial and temporal trends' in Second National Hydrological Symposium, August 1989. Institute of Hydrology, Wallingford. pp. 1.49-1.57.
17. Kirby, C., Newson, M. D., and Oilman, K. 1991. 'Plynlimon research, the first two decades', Inst. Hydrol. Rep. 109, 1-187.
18. Kirchner, J. 1993. 'Chronic base depletion revealed by long term monitoring from Norwegian catchments' in Cerny, J. (Ed.) Abstract, BIOGEOMON Symposium on Ecosystem Behaviour, Prague, September 1993. Czech Geological Survey, Prague. pp. 146-147.
19. Moldan, B. and Cerny, J. 1994. 'Small catchment research' in Moldan, B. and Cerny, J. (Eds). Biogeochemistry of Small Catchments: a Tool for Environmental Research. Wiley, Chichester. pp. 1-29.
20. McDonald, A. T., Edwards, A. M. C., Naden, P. S., Martin, D., and Mitchell, G. 1989. 'Discoloured runoff in the Yorkshire Pennines' in Second National Hydrological Symposium, August 1989. Institute of Hydrology, Wallingford. pp. 1.49-1.57.
21. Mulder, J. and Cresser, M. S. 1994. 'Soil and soil solution chemistry' in Moldan, B. and Cerny, J. (Eds). Biogeochemistry of Small Catchments: a Tool for Environmental Research. Wiley, Chichester. pp. 107-131.
22. Neal, C. and Rosier, P. T. W. 1990. 'Chemical studies of chloride and stable oxygen isotopes in two conifer afforested and moorland sites in the British uplands', J. Hydrol., 15, 269-283.
23. Neal, C., Walls, J., and Dunn, C. S. 1986. 'Major, minor and trace element mobility in the acidic forested upland catchment of the upper River Severn, Mid-Wales', Q. J. Geol. Soc. London, 143, 635-648.
24. Neal, C., Smith, C. J., and Hill, S., 1992. 'Forestry impact on upland water quality', Inst. Hydrol. Rep., 119, 1-50.
25. Neal, C., Smith, C. J., Walls, J., Billingham, P., Hill, S., and Neal, M. 1990a. 'Hydrogeochemical variations in Hafren forest streams, Mid-Wales', J. Hydrol., 116, 185-200.
26. Neal, C., Smith, C. J., Walls, J., Billingham, P., Hill, S., and Neal, M. 1990b. 'Comments on the hydrochemical regulation of the halogen elements in rainfall, stemflow, throughfall and stream waters at an acidic forested area in mid-Wales', Sci. Total Environ., 91, 1-11.
27. Newell, A. D. 1993. 'Inter-regional comparison of patterns and trends in surface water acidification across the United States', Wat. Air. Soil. Pollut., 67, 257-280.
28. Newson, M. D. 1976. 'The physiography, deposits and vegetation of the Plynlimon catchments', Inst. Hydrol. Rep., 30, 1-59.
29. Plessis du, H. M. and Veelen van, M. 1991. 'Water quality: salinization and eutrophication time series and trends in South Africa', South Afr. J. Sci. 87, 11-16.
30. Reynolds, B. and Pommeroy, A. B. 1988. 'Hydrogeochemistry of chloride in an upland catchment in mid-Wales', J. Hydrol., 99, 19-32.
31. Reynolds, B., Neal, C., Hornung, M., and Stevens, P. A. 1986. 'Baseflow buffering of stream water acidity in five mid-Wales catchments', J. Hydrol., 87, 167-185.
32. Robson, A. J. 1993. 'The uses of continuous measurement in understanding and modelling the hydrochemistry of the uplands', PhD Thesis, Univ. Lancaster, 278 pp.
33. Sen, P. K. 1968. 'Estimates of the regression coefficient base on Kendall's Tau', J. Am. Statis. Assoc., 63, 1379-1389.
34. Sirois, A. 1993. 'Temporal variation of sulphate and nitrate concentration in precipitation in eastern north America, 1979-1990', Atmos. Environ. 27A, 945-963.
35. Sirois, A. and Summers, P. W. 1989. 'An estimation of the atmospheric input of sulphur and nitrogen oxides to the Kejimkujik Watershed: 1979-1987', Wat. Air. Soil Pollut., 46, 29-43.
36. Statistical Sciences 1993. S-PLUS Reference Manual, Version 3.2. StatSci, a division of MathSoft, Seattle.
37. Taylor, C. H. and Loftis, J. C. 1989. 'Testing for trend in Lake and ground water quality time series', Wat. Resour. Bull. 25, 715-726.
38. UK Acid Waters Monitoring Network 1991. Site Descriptions and Methodology. Ensis, London.
39. UK Acid Waters Review Group, 1988. Acidity in the United Kingdom Fresh Waters. Second Report. HMSO, London. 61pp.
40. UK Review Group on Acid Rain 1990. Acid Deposition in the United Kingdom, 1986-1988. Third Report. Department of the Environment, London.
41. Vesely, J. 1994. 'Effect of acidification on trace metal transport in fresh waters' in Steinberg, C. E. W. and Wright, R. F. (Eds), Acidification of Fresh Waters; Implications for the Future. Wiley, Chichester. pp. 141-151.
42. Walker, W. W. 1991. 'Water quality trends at inflows to Everglades National Park', Wat. Resour. Bull., 27, 59-72.
43. Waters, D. and Jenkins, A. 1992. 'Impacts of afforestation on water quality trends in two catchments in Mid-Wales', Environ. Pollut., 77, 167-172.