Fine‐grained bed sediment storage within the main channel systems of the Frome and Piddle catchments, Dorset, UK

摘要: Lowland permeable catchments in the UK are particularly prone to sedimentation problems, on account of increased fine sediment loadings generated by recent land-use change and their stable seasonal hydrological regimes, which frequently depleted groundwater abstraction. Fine-grained storage bed main channel systems Frome (437 km2) Piddle (183 catchments, Dorset, UK, has been examined at 29 sites using a remobilization technique. Measurements encompassed period February 2003–July 2004. At individual Frome, average values ranged between 410 2630 g m−2, with an overall mean 918 m−2. In Piddle, for varied 260 4340 1580 Temporal variations each site were appreciable, coefficients variation ranging 43 155% 33 160% Piddle. Average reach-scale specific markedly downstream along stem from 2 t km−1 (Frome) 4 19 (Piddle). Total 479 (5 km−1) 1694 (17 km−1), 795 (7 compared 371 1238 (14 730 (9 During study period, was typically equivalent 18% 57% (Piddle) annual suspended flux catchment outlets. Copyright © 2006 John Wiley & Sons, Ltd.