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Modelling suspended sediment lead concentrations in contaminated peatland catchments using digital terrain analysis
Authors:James J Rothwell  John B Lindsay  Martin G Evans  Timothy EH Allott
Institution:1. Department of Environmental and Geographical Sciences, Manchester Metropolitan University, John Dalton Building, Chester Street, Manchester M1 5GD, UK;2. Upland Environments Research Unit, School of Environment and Development, The University of Manchester, Oxford Road, Manchester M13 9PL, UK;3. Department of Geography, College of Social and Applied Human Sciences, The University of Guelph, Guelph, Ontario, Canada N1G 2W1;1. Dept. of Earth Sciences, Science Laboratories, South Road, Durham DH1 3LE, UK;2. Centre for Ecology & Hydrology, Deiniol Road, Bangor, Gwynedd LL57 2UW, UK;3. School of Biological Sciences, Bangor University, Deiniol Road, Bangor, Gwynedd LL57 2UW, UK;1. Key Laboratory of Advanced Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, Nanjing, Jiangsu, 210093, PR China;2. College of Optoelectronics Engineering, Zaozhuang University, Zaozhuang, 277160, PR China;3. Institute of Opto-Electronics, Nanjing University, Yangzhou, 225009, PR China;1. College of Geography and Environment, Shandong Normal University, Jinan 250014, China;2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;1. School of Environmental Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong Province, China;2. College of Engineering, Peking University, Beijing 100871, China;3. School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
Abstract:Upland peat soils in close proximity to urban and industrial areas can be contaminated with high concentrations of atmospherically deposited lead. The peat soils of the Peak District (UK) are characterised by extensive eroding gullies. Fine-resolution digital topographic data were used to map the extent and depth of these gullies. Peat samples from eroding gully walls and suspended sediments were collected and analysed for lead content. Variability in lead concentrations of gully wall material and suspended sediments can be explained by differences in mean upslope gully depth. The lead content of suspended sediment exported from catchments characterised by shallow peat gullies is higher than that exported from catchments with deep peat gullies. The empirical relationship between sediment-associated lead concentration and mean upslope gully depth was combined with the gully depth mapping to produce a predictive spatial model of suspended sediment lead concentrations across the Peak District. This model may be particularly useful for catchment managers who are currently involved in the restoration of eroding peat soils in the Peak District uplands.
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