title: Seasonal and spatial variation of diffuse (non-point) source zinc pollution in a historically metal mined river catchment, UK.
abstract: Quantifying diffuse sources of pollution is becoming increasingly important when characterising river catchments in entirety - a prerequisite for environmental management. This study examines both low and high flow events, as well as spatial variability, in order to assess point and diffuse components of zinc pollution within the River West Allen catchment, which lies within the northern England lead-zinc Orefield. Zinc levels in the river are elevated under all flow regimes, and are of environmental concern. Diffuse components are of little importance at low flow, with point source mine water discharges dominating instream zinc concentration and load. During higher river flows 90% of the instream zinc load is attributed to diffuse sources, where inputs from resuspension of metal-rich sediments, and groundwater influx are likely to be more dominant. Remediating point mine water discharges should significantly improve water quality at lower flows, but contribution from diffuse sources will continue to elevate zinc flux at higher flows.
authors.affiliation: Hydrogeochemical Engineering Research and Outreach Group, School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne NE1 7RU, UK. emgo@ceh.ac.uk
authors.forename: E
authors.initials: E
authors.lastname: Gozzard
authors.forename: W M
authors.initials: WM
authors.lastname: Mayes
authors.forename: H A B
authors.initials: HA
authors.lastname: Potter
authors.forename: A P
authors.initials: AP
authors.lastname: Jarvis
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry; D008906:Mining; D045483:Rivers / Q000737:chemistry*; D012621:Seasons; D006113:United Kingdom; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data*; D014881:Water Supply / Q000706:statistics & numerical data; D015032:Zinc / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D015032:Zinc