The storage and provenance of fine sediment on the channel bed of two contrasting lowland permeable catchments, UK

Fine sediment (<63 µm) storage in river channels frequently represents a significant term in catchment sediment budgets and plays an important role in diffuse pollution problems. A combination of a sediment remobilization technique and the fingerprinting approach was used to examine the storage and provenance of fine sediment on the channel bed of two contrasting lowland permeable catchments in the UK. In the upper Tern (∼231 km2) study catchment, estimates of mean fine sediment storage on the channel bed ranged between 860–5500 g m−2, with an overall average of 2391 g m−2, compared to 470–2290 g m−2 and 1065 g m−2 in the Pang (∼166 km2) and 770–1760 g m−2 and 1255 g m−2 in the Lambourn (∼234 km2) sub-catchments. Mean total fine sediment storage on the bed of the main channel was equivalent to 37% (upper Tern), 38% (Pang) and 21% (Lambourn) of the mean annual suspended sediment loads measured at the catchment outlets. Over the study period, the total gain (1427 t) and loss (1877 t) to fine sediment storage on the channel bed in the upper Tern catchment were equivalent to 82% and 108% of the mean annual suspended sediment load, respectively, compared to 149% (740 t) and 136% (678 t) in the Pang sub-catchment, and 39% (422 t) and 49% (528 t) in the Lambourn sub-catchment. The source of the fine sediment stored on the channel bed within each study area varied. In the upper Tern catchment, the weighted mean relative contributions from individual source types were estimated to be 35 ± 5% (pasture), 51 ± 5% (cultivated) and 14 ± 3% (channel banks and subsurface sources). The corresponding estimates were 49 ± 8%, 33 ± 5% and 18 ± 5% for the Pang sub-catchment, compared to 19 ± 6%, 64 ± 5% and 17 ± 5% for the Lambourn sub-catchment. These sediment source estimates have important implications for the design and implementation of targeted sediment control policies within the study areas. Copyright © 2007 John Wiley & Sons, Ltd.

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